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This commit is contained in:
James Tauber
parent
fe80bc897d
commit
d340d9cb5f
78
applepy.py
78
applepy.py
@ -17,7 +17,7 @@ import wave
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class Display:
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characters = [
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[0b00000, 0b01110, 0b10001, 0b10101, 0b10111, 0b10110, 0b10000, 0b01111],
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[0b00000, 0b00100, 0b01010, 0b10001, 0b10001, 0b11111, 0b10001, 0b10001],
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@ -84,7 +84,7 @@ class Display:
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[0b00000, 0b01000, 0b00100, 0b00010, 0b00001, 0b00010, 0b00100, 0b01000],
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[0b00000, 0b01110, 0b10001, 0b00010, 0b00100, 0b00100, 0b00000, 0b00100]
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]
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lores_colours = [
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(0, 0, 0), # black
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(208, 0, 48), # magenta / dark red
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@ -103,7 +103,7 @@ class Display:
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(64, 255, 144), # aquamarine / light green
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(255, 255, 255), # white
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]
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def __init__(self):
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self.screen = pygame.display.set_mode((560, 384))
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pygame.display.set_caption("ApplePy")
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@ -115,7 +115,7 @@ class Display:
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self.page = 1
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self.text = True
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self.colour = False
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self.chargen = []
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for c in self.characters:
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chars = [[pygame.Surface((14, 16)), pygame.Surface((14, 16))],
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@ -134,33 +134,33 @@ class Display:
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pixels[2 * col + 1][2 * row] = on if bit else off
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del pixels
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self.chargen.append(chars)
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def txtclr(self):
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self.text = False
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def txtset(self):
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self.text = True
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self.colour = False
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def mixclr(self):
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self.mix = False
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def mixset(self):
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self.mix = True
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self.colour = True
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def lowscr(self):
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self.page = 1
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def hiscr(self):
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self.page = 2
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def lores(self):
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self.high_res = False
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def hires(self):
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self.high_res = True
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def update(self, address, value):
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if self.page == 1:
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start_text = 0x400
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@ -170,33 +170,33 @@ class Display:
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start_hires = 0x4000
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else:
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return
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if start_text <= address <= start_text + 0x3FF:
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base = address - start_text
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self.flash_chars[self.page - 1][base] = value
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hi, lo = divmod(base, 0x80)
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row_group, column = divmod(lo, 0x28)
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row = hi + 8 * row_group
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if row_group == 3:
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return
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if self.text or not self.mix or not row < 20:
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mode, ch = divmod(value, 0x40)
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if mode == 0:
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inv = True
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elif mode == 1:
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inv = self.flash_on
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else:
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inv = False
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self.screen.blit(self.chargen[ch][self.colour][inv], (2 * (column * 7), 2 * (row * 8)))
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else:
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pixels = pygame.PixelArray(self.screen)
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if not self.high_res:
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lower, upper = divmod(value, 0x10)
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for dx in range(14):
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for dy in range(8):
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x = column * 14 + dx
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@ -207,7 +207,7 @@ class Display:
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y = row * 16 + dy
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pixels[x][y] = self.lores_colours[lower]
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del pixels
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elif start_hires <= address <= start_hires + 0x1FFF:
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if self.high_res:
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base = address - start_hires
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@ -215,21 +215,21 @@ class Display:
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hi, lo = divmod(b, 0x80)
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row_group, column = divmod(lo, 0x28)
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row = 8 * (hi + 8 * row_group) + row8
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if self.mix and row >= 160:
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return
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if row < 192 and column < 40:
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pixels = pygame.PixelArray(self.screen)
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msb = value // 0x80
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for b in range(7):
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c = value & (1 << b)
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xx = (column * 7 + b)
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x = 2 * xx
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y = 2 * row
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if msb:
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if xx % 2:
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pixels[x][y] = (0, 0, 0)
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@ -252,10 +252,10 @@ class Display:
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pixels[x][y] = (255, 0, 255) if c else (0, 0, 0)
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pixels[x + 1][y] = (0, 0, 0)
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pixels[x + 1][y] = (255, 0, 255) if c else (0, 0, 0) # @@@
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pixels[x][y + 1] = (0, 0, 0)
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pixels[x + 1][y + 1] = (0, 0, 0)
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del pixels
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def flash(self):
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@ -268,15 +268,15 @@ class Display:
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class Speaker:
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CPU_CYCLES_PER_SAMPLE = 60
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CHECK_INTERVAL = 1000
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def __init__(self):
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pygame.mixer.pre_init(11025, -16, 1)
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pygame.init()
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self.reset()
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def toggle(self, cycle):
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if self.last_toggle is not None:
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l = (cycle - self.last_toggle) / Speaker.CPU_CYCLES_PER_SAMPLE
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@ -284,18 +284,18 @@ class Speaker:
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self.buffer.extend((l - 2) * [16384] if self.polarity else [-16384])
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self.polarity = not self.polarity
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self.last_toggle = cycle
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def reset(self):
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self.last_toggle = None
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self.buffer = []
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self.polarity = False
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def play(self):
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sample_array = numpy.int16(self.buffer)
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sound = pygame.sndarray.make_sound(sample_array)
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sound.play()
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self.reset()
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def update(self, cycle):
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if self.buffer and (cycle - self.last_toggle) > self.CHECK_INTERVAL:
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self.play()
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@ -322,13 +322,13 @@ class Cassette:
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class SoftSwitches:
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def __init__(self, display, speaker, cassette):
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self.kbd = 0x00
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self.display = display
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self.speaker = speaker
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self.cassette = cassette
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def read_byte(self, cycle, address):
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assert 0xC000 <= address <= 0xCFFF
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if address == 0xC000:
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@ -409,11 +409,11 @@ class Apple2:
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self.display.update(addr, val)
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else:
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break
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for event in pygame.event.get():
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if event.type == pygame.QUIT:
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quit = True
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if event.type == pygame.KEYDOWN:
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key = ord(event.unicode) if event.unicode else 0
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if event.key == pygame.K_LEFT:
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@ -424,7 +424,7 @@ class Apple2:
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if key == 0x7F:
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key = 0x08
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self.softswitches.kbd = 0x80 + (key & 0x7F)
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update_cycle += 1
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if update_cycle >= 1024:
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self.display.flash()
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@ -432,7 +432,7 @@ class Apple2:
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if self.speaker:
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self.speaker.update(cycle)
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update_cycle = 0
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def usage():
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print >>sys.stderr, "ApplePy - an Apple ][ emulator in Python"
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@ -18,13 +18,13 @@ def write_screen(win, address, value):
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hi, lo = divmod(base, 0x80)
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row_group, column = divmod(lo, 0x28)
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row = hi + 8 * row_group
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# skip if writing to row group 3
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if row_group == 3:
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return
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c = chr(0x20 + ((value + 0x20) % 0x40))
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if value < 0x40:
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attr = curses.A_DIM
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elif value < 0x80:
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@ -33,7 +33,7 @@ def write_screen(win, address, value):
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attr = curses.A_UNDERLINE
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else:
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attr = curses.A_DIM
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try:
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win.addch(row, column, c, attr)
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except curses.error:
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@ -95,7 +95,7 @@ def run(win):
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pass
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except TypeError:
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pass
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def usage():
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print >>sys.stderr, "ApplePy - an Apple ][ emulator in Python"
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306
cpu6502.py
306
cpu6502.py
@ -22,50 +22,50 @@ def signed(x):
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class ROM:
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def __init__(self, start, size):
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self.start = start
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self.end = start + size - 1
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self._mem = [0x00] * size
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def load(self, address, data):
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for offset, datum in enumerate(data):
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self._mem[address - self.start + offset] = datum
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def load_file(self, address, filename):
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with open(filename, "rb") as f:
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for offset, datum in enumerate(f.read()):
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self._mem[address - self.start + offset] = ord(datum)
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def read_byte(self, address):
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assert self.start <= address <= self.end
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return self._mem[address - self.start]
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class RAM(ROM):
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def write_byte(self, address, value):
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self._mem[address] = value
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class Memory:
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def __init__(self, options=None, use_bus=True):
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self.use_bus = use_bus
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self.rom = ROM(0xD000, 0x3000)
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if options:
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self.rom.load_file(0xD000, options.rom)
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self.ram = RAM(0x0000, 0xC000)
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if options and options.ram:
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self.ram.load_file(0x0000, options.ram)
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def load(self, address, data):
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if address < 0xC000:
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self.ram.load(address, data)
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def read_byte(self, cycle, address):
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if address < 0xC000:
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return self.ram.read_byte(address)
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@ -73,16 +73,16 @@ class Memory:
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return self.bus_read(cycle, address)
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else:
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return self.rom.read_byte(address)
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def read_word(self, cycle, address):
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return self.read_byte(cycle, address) + (self.read_byte(cycle + 1, address + 1) << 8)
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def read_word_bug(self, cycle, address):
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if address % 0x100 == 0xFF:
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return self.read_byte(cycle, address) + (self.read_byte(cycle + 1, address & 0xFF00) << 8)
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else:
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return self.read_word(cycle, address)
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def write_byte(self, cycle, address, value):
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if address < 0xC000:
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self.ram.write_byte(address, value)
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@ -116,9 +116,9 @@ class Disassemble:
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def __init__(self, cpu, memory):
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self.cpu = cpu
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self.memory = memory
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self.setup_ops()
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def setup_ops(self):
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self.ops = [(1, "???")] * 0x100
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self.ops[0x00] = (1, "BRK", )
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@ -272,14 +272,14 @@ class Disassemble:
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self.ops[0xF9] = (3, "SBC", self.absolute_y_mode)
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self.ops[0xFD] = (3, "SBC", self.absolute_x_mode)
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self.ops[0xFE] = (3, "INC", self.absolute_x_mode)
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def absolute_mode(self, pc):
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a = self.cpu.read_word(pc + 1)
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return {
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"operand": "$%04X" % a,
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"memory": [a, 2, self.cpu.read_word(a)],
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}
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def absolute_x_mode(self, pc):
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a = self.cpu.read_word(pc + 1)
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e = a + self.cpu.x_index
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@ -287,7 +287,7 @@ class Disassemble:
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"operand": "$%04X,X" % a,
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"memory": [e, 1, self.cpu.read_byte(e)],
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}
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def absolute_y_mode(self, pc):
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a = self.cpu.read_word(pc + 1)
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e = a + self.cpu.y_index
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@ -295,19 +295,19 @@ class Disassemble:
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"operand": "$%04X,Y" % a,
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"memory": [e, 1, self.cpu.read_byte(e)],
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}
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def immediate_mode(self, pc):
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return {
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"operand": "#$%02X" % (self.cpu.read_byte(pc + 1)),
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}
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def indirect_mode(self, pc):
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a = self.cpu.read_word(pc + 1)
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return {
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"operand": "($%04X)" % a,
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"memory": [a, 2, self.cpu.read_word(a)],
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}
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def indirect_x_mode(self, pc):
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z = self.cpu.read_byte(pc + 1)
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a = self.cpu.read_word((z + self.cpu.x_index) % 0x100)
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@ -315,7 +315,7 @@ class Disassemble:
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"operand": "($%02X,X)" % z,
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"memory": [a, 1, self.cpu.read_byte(a)],
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}
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def indirect_y_mode(self, pc):
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z = self.cpu.read_byte(pc + 1)
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a = self.cpu.read_word(z) + self.cpu.y_index
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@ -323,19 +323,19 @@ class Disassemble:
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"operand": "($%02X),Y" % z,
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"memory": [a, 1, self.cpu.read_byte(a)],
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}
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def relative_mode(self, pc):
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return {
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"operand": "$%04X" % (pc + signed(self.cpu.read_byte(pc + 1) + 2)),
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}
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def zero_page_mode(self, pc):
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a = self.cpu.read_byte(pc + 1)
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return {
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"operand": "$%02X" % a,
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"memory": [a, 1, self.cpu.read_byte(a)],
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}
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def zero_page_x_mode(self, pc):
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z = self.cpu.read_byte(pc + 1)
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a = (z + self.cpu.x_index) % 0x100
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@ -343,7 +343,7 @@ class Disassemble:
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"operand": "$%02X,X" % z,
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"memory": [a, 1, self.cpu.read_byte(a)],
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}
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def zero_page_y_mode(self, pc):
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z = self.cpu.read_byte(pc + 1)
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a = (z + self.cpu.y_index) % 0x100
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@ -351,7 +351,7 @@ class Disassemble:
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"operand": "$%02X,Y" % z,
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"memory": [a, 1, self.cpu.read_byte(a)],
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}
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def disasm(self, pc):
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op = self.cpu.read_byte(pc)
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info = self.ops[op]
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@ -501,19 +501,19 @@ class ControlHandlerFactory:
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class CPU:
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STACK_PAGE = 0x100
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RESET_VECTOR = 0xFFFC
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def __init__(self, options, memory):
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self.memory = memory
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self.control_server = BaseHTTPServer.HTTPServer(("127.0.0.1", 6502), ControlHandlerFactory(self))
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self.accumulator = 0x00
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self.x_index = 0x00
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self.y_index = 0x00
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self.carry_flag = 0
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self.zero_flag = 0
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self.interrupt_disable_flag = 0
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@ -521,18 +521,18 @@ class CPU:
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self.break_flag = 1
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self.overflow_flag = 0
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self.sign_flag = 0
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self.stack_pointer = 0xFF
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self.cycles = 0
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self.setup_ops()
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self.reset()
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if options.pc is not None:
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self.program_counter = options.pc
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self.running = True
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self.quit = False
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||||
def setup_ops(self):
|
||||
self.ops = [None] * 0x100
|
||||
self.ops[0x00] = lambda: self.BRK()
|
||||
@ -686,10 +686,10 @@ class CPU:
|
||||
self.ops[0xF9] = lambda: self.SBC(self.absolute_y_mode())
|
||||
self.ops[0xFD] = lambda: self.SBC(self.absolute_x_mode())
|
||||
self.ops[0xFE] = lambda: self.INC(self.absolute_x_mode(rmw=True))
|
||||
|
||||
|
||||
def reset(self):
|
||||
self.program_counter = self.read_word(self.RESET_VECTOR)
|
||||
|
||||
|
||||
def run(self, bus_port):
|
||||
global bus
|
||||
bus = socket.socket()
|
||||
@ -725,7 +725,7 @@ class CPU:
|
||||
else:
|
||||
self.ops[op]()
|
||||
count -= 1
|
||||
|
||||
|
||||
def test_run(self, start, end):
|
||||
self.program_counter = start
|
||||
while True:
|
||||
@ -741,34 +741,34 @@ class CPU:
|
||||
break
|
||||
else:
|
||||
self.ops[op]()
|
||||
|
||||
|
||||
####
|
||||
|
||||
|
||||
def get_pc(self, inc=1):
|
||||
pc = self.program_counter
|
||||
self.program_counter += inc
|
||||
return pc
|
||||
|
||||
|
||||
def read_byte(self, address):
|
||||
return self.memory.read_byte(self.cycles, address)
|
||||
|
||||
|
||||
def read_word(self, address):
|
||||
return self.memory.read_word(self.cycles, address)
|
||||
|
||||
|
||||
def read_word_bug(self, address):
|
||||
return self.memory.read_word_bug(self.cycles, address)
|
||||
|
||||
|
||||
def read_pc_byte(self):
|
||||
return self.read_byte(self.get_pc())
|
||||
|
||||
|
||||
def read_pc_word(self):
|
||||
return self.read_word(self.get_pc(2))
|
||||
|
||||
def write_byte(self, address, value):
|
||||
self.memory.write_byte(self.cycles, address, value)
|
||||
|
||||
|
||||
####
|
||||
|
||||
|
||||
def status_from_byte(self, status):
|
||||
self.carry_flag = [0, 1][0 != status & 1]
|
||||
self.zero_flag = [0, 1][0 != status & 2]
|
||||
@ -777,143 +777,143 @@ class CPU:
|
||||
self.break_flag = [0, 1][0 != status & 16]
|
||||
self.overflow_flag = [0, 1][0 != status & 64]
|
||||
self.sign_flag = [0, 1][0 != status & 128]
|
||||
|
||||
|
||||
def status_as_byte(self):
|
||||
return self.carry_flag | self.zero_flag << 1 | self.interrupt_disable_flag << 2 | self.decimal_mode_flag << 3 | self.break_flag << 4 | 1 << 5 | self.overflow_flag << 6 | self.sign_flag << 7
|
||||
|
||||
return self.carry_flag | self.zero_flag << 1 | self.interrupt_disable_flag << 2 | self.decimal_mode_flag << 3 | self.break_flag << 4 | 1 << 5 | self.overflow_flag << 6 | self.sign_flag << 7
|
||||
|
||||
####
|
||||
|
||||
|
||||
def push_byte(self, byte):
|
||||
self.write_byte(self.STACK_PAGE + self.stack_pointer, byte)
|
||||
self.stack_pointer = (self.stack_pointer - 1) % 0x100
|
||||
|
||||
|
||||
def pull_byte(self):
|
||||
self.stack_pointer = (self.stack_pointer + 1) % 0x100
|
||||
return self.read_byte(self.STACK_PAGE + self.stack_pointer)
|
||||
|
||||
|
||||
def push_word(self, word):
|
||||
hi, lo = divmod(word, 0x100)
|
||||
self.push_byte(hi)
|
||||
self.push_byte(lo)
|
||||
|
||||
|
||||
def pull_word(self):
|
||||
s = self.STACK_PAGE + self.stack_pointer + 1
|
||||
self.stack_pointer += 2
|
||||
return self.read_word(s)
|
||||
|
||||
|
||||
####
|
||||
|
||||
|
||||
def immediate_mode(self):
|
||||
return self.get_pc()
|
||||
|
||||
|
||||
def absolute_mode(self):
|
||||
self.cycles += 2
|
||||
return self.read_pc_word()
|
||||
|
||||
|
||||
def absolute_x_mode(self, rmw=False):
|
||||
if rmw:
|
||||
self.cycles += 1
|
||||
return self.absolute_mode() + self.x_index
|
||||
|
||||
|
||||
def absolute_y_mode(self, rmw=False):
|
||||
if rmw:
|
||||
self.cycles += 1
|
||||
return self.absolute_mode() + self.y_index
|
||||
|
||||
|
||||
def zero_page_mode(self):
|
||||
self.cycles += 1
|
||||
return self.read_pc_byte()
|
||||
|
||||
|
||||
def zero_page_x_mode(self):
|
||||
self.cycles += 1
|
||||
return (self.zero_page_mode() + self.x_index) % 0x100
|
||||
|
||||
|
||||
def zero_page_y_mode(self):
|
||||
self.cycles += 1
|
||||
return (self.zero_page_mode() + self.y_index) % 0x100
|
||||
|
||||
|
||||
def indirect_mode(self):
|
||||
self.cycles += 2
|
||||
return self.read_word_bug(self.absolute_mode())
|
||||
|
||||
|
||||
def indirect_x_mode(self):
|
||||
self.cycles += 4
|
||||
return self.read_word_bug((self.read_pc_byte() + self.x_index) % 0x100)
|
||||
|
||||
|
||||
def indirect_y_mode(self, rmw=False):
|
||||
if rmw:
|
||||
self.cycles += 4
|
||||
else:
|
||||
self.cycles += 3
|
||||
return self.read_word_bug(self.read_pc_byte()) + self.y_index
|
||||
|
||||
|
||||
def relative_mode(self):
|
||||
pc = self.get_pc()
|
||||
return pc + 1 + signed(self.read_byte(pc))
|
||||
|
||||
|
||||
####
|
||||
|
||||
|
||||
def update_nz(self, value):
|
||||
value = value % 0x100
|
||||
self.zero_flag = [0, 1][(value == 0)]
|
||||
self.sign_flag = [0, 1][((value & 0x80) != 0)]
|
||||
return value
|
||||
|
||||
|
||||
def update_nzc(self, value):
|
||||
self.carry_flag = [0, 1][(value > 0xFF)]
|
||||
return self.update_nz(value)
|
||||
|
||||
|
||||
####
|
||||
|
||||
|
||||
# LOAD / STORE
|
||||
|
||||
|
||||
def LDA(self, operand_address):
|
||||
self.accumulator = self.update_nz(self.read_byte(operand_address))
|
||||
|
||||
|
||||
def LDX(self, operand_address):
|
||||
self.x_index = self.update_nz(self.read_byte(operand_address))
|
||||
|
||||
|
||||
def LDY(self, operand_address):
|
||||
self.y_index = self.update_nz(self.read_byte(operand_address))
|
||||
|
||||
|
||||
def STA(self, operand_address):
|
||||
self.write_byte(operand_address, self.accumulator)
|
||||
|
||||
|
||||
def STX(self, operand_address):
|
||||
self.write_byte(operand_address, self.x_index)
|
||||
|
||||
|
||||
def STY(self, operand_address):
|
||||
self.write_byte(operand_address, self.y_index)
|
||||
|
||||
|
||||
# TRANSFER
|
||||
|
||||
|
||||
def TAX(self):
|
||||
self.x_index = self.update_nz(self.accumulator)
|
||||
|
||||
|
||||
def TXA(self):
|
||||
self.accumulator = self.update_nz(self.x_index)
|
||||
|
||||
|
||||
def TAY(self):
|
||||
self.y_index = self.update_nz(self.accumulator)
|
||||
|
||||
|
||||
def TYA(self):
|
||||
self.accumulator = self.update_nz(self.y_index)
|
||||
|
||||
|
||||
def TSX(self):
|
||||
self.x_index = self.update_nz(self.stack_pointer)
|
||||
|
||||
|
||||
def TXS(self):
|
||||
self.stack_pointer = self.x_index
|
||||
|
||||
|
||||
# SHIFTS / ROTATES
|
||||
|
||||
|
||||
def ASL(self, operand_address=None):
|
||||
if operand_address is None:
|
||||
self.accumulator = self.update_nzc(self.accumulator << 1)
|
||||
else:
|
||||
self.cycles += 2
|
||||
self.write_byte(operand_address, self.update_nzc(self.read_byte(operand_address) << 1))
|
||||
|
||||
|
||||
def ROL(self, operand_address=None):
|
||||
if operand_address is None:
|
||||
a = self.accumulator << 1
|
||||
@ -926,7 +926,7 @@ class CPU:
|
||||
if self.carry_flag:
|
||||
m = m | 0x01
|
||||
self.write_byte(operand_address, self.update_nzc(m))
|
||||
|
||||
|
||||
def ROR(self, operand_address=None):
|
||||
if operand_address is None:
|
||||
if self.carry_flag:
|
||||
@ -940,7 +940,7 @@ class CPU:
|
||||
m = m | 0x100
|
||||
self.carry_flag = m % 2
|
||||
self.write_byte(operand_address, self.update_nz(m >> 1))
|
||||
|
||||
|
||||
def LSR(self, operand_address=None):
|
||||
if operand_address is None:
|
||||
self.carry_flag = self.accumulator % 2
|
||||
@ -949,224 +949,224 @@ class CPU:
|
||||
self.cycles += 2
|
||||
self.carry_flag = self.read_byte(operand_address) % 2
|
||||
self.write_byte(operand_address, self.update_nz(self.read_byte(operand_address) >> 1))
|
||||
|
||||
|
||||
# JUMPS / RETURNS
|
||||
|
||||
|
||||
def JMP(self, operand_address):
|
||||
self.cycles -= 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def JSR(self, operand_address):
|
||||
self.cycles += 2
|
||||
self.push_word(self.program_counter - 1)
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def RTS(self):
|
||||
self.cycles += 4
|
||||
self.program_counter = self.pull_word() + 1
|
||||
|
||||
|
||||
# BRANCHES
|
||||
|
||||
|
||||
def BCC(self, operand_address):
|
||||
if not self.carry_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BCS(self, operand_address):
|
||||
if self.carry_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BEQ(self, operand_address):
|
||||
if self.zero_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BNE(self, operand_address):
|
||||
if not self.zero_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BMI(self, operand_address):
|
||||
if self.sign_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BPL(self, operand_address):
|
||||
if not self.sign_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BVC(self, operand_address):
|
||||
if not self.overflow_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
def BVS(self, operand_address):
|
||||
if self.overflow_flag:
|
||||
self.cycles += 1
|
||||
self.program_counter = operand_address
|
||||
|
||||
|
||||
# SET / CLEAR FLAGS
|
||||
|
||||
|
||||
def CLC(self):
|
||||
self.carry_flag = 0
|
||||
|
||||
|
||||
def CLD(self):
|
||||
self.decimal_mode_flag = 0
|
||||
|
||||
|
||||
def CLI(self):
|
||||
self.interrupt_disable_flag = 0
|
||||
|
||||
|
||||
def CLV(self):
|
||||
self.overflow_flag = 0
|
||||
|
||||
|
||||
def SEC(self):
|
||||
self.carry_flag = 1
|
||||
|
||||
|
||||
def SED(self):
|
||||
self.decimal_mode_flag = 1
|
||||
|
||||
|
||||
def SEI(self):
|
||||
self.interrupt_disable_flag = 1
|
||||
|
||||
|
||||
# INCREMENT / DECREMENT
|
||||
|
||||
|
||||
def DEC(self, operand_address):
|
||||
self.cycles += 2
|
||||
self.write_byte(operand_address, self.update_nz(self.read_byte(operand_address) - 1))
|
||||
|
||||
|
||||
def DEX(self):
|
||||
self.x_index = self.update_nz(self.x_index - 1)
|
||||
|
||||
|
||||
def DEY(self):
|
||||
self.y_index = self.update_nz(self.y_index - 1)
|
||||
|
||||
|
||||
def INC(self, operand_address):
|
||||
self.cycles += 2
|
||||
self.write_byte(operand_address, self.update_nz(self.read_byte(operand_address) + 1))
|
||||
|
||||
|
||||
def INX(self):
|
||||
self.x_index = self.update_nz(self.x_index + 1)
|
||||
|
||||
|
||||
def INY(self):
|
||||
self.y_index = self.update_nz(self.y_index + 1)
|
||||
|
||||
|
||||
# PUSH / PULL
|
||||
|
||||
|
||||
def PHA(self):
|
||||
self.cycles += 1
|
||||
self.push_byte(self.accumulator)
|
||||
|
||||
|
||||
def PHP(self):
|
||||
self.cycles += 1
|
||||
self.push_byte(self.status_as_byte())
|
||||
|
||||
|
||||
def PLA(self):
|
||||
self.cycles += 2
|
||||
self.accumulator = self.update_nz(self.pull_byte())
|
||||
|
||||
|
||||
def PLP(self):
|
||||
self.cycles += 2
|
||||
self.status_from_byte(self.pull_byte())
|
||||
|
||||
|
||||
# LOGIC
|
||||
|
||||
|
||||
def AND(self, operand_address):
|
||||
self.accumulator = self.update_nz(self.accumulator & self.read_byte(operand_address))
|
||||
|
||||
|
||||
def ORA(self, operand_address):
|
||||
self.accumulator = self.update_nz(self.accumulator | self.read_byte(operand_address))
|
||||
|
||||
|
||||
def EOR(self, operand_address):
|
||||
self.accumulator = self.update_nz(self.accumulator ^ self.read_byte(operand_address))
|
||||
|
||||
|
||||
# ARITHMETIC
|
||||
|
||||
|
||||
def ADC(self, operand_address):
|
||||
# @@@ doesn't handle BCD yet
|
||||
assert not self.decimal_mode_flag
|
||||
|
||||
|
||||
a2 = self.accumulator
|
||||
a1 = signed(a2)
|
||||
m2 = self.read_byte(operand_address)
|
||||
m1 = signed(m2)
|
||||
|
||||
|
||||
# twos complement addition
|
||||
result1 = a1 + m1 + self.carry_flag
|
||||
|
||||
|
||||
# unsigned addition
|
||||
result2 = a2 + m2 + self.carry_flag
|
||||
|
||||
|
||||
self.accumulator = self.update_nzc(result2)
|
||||
|
||||
|
||||
# perhaps this could be calculated from result2 but result1 is more intuitive
|
||||
self.overflow_flag = [0, 1][(result1 > 127) | (result1 < -128)]
|
||||
|
||||
|
||||
def SBC(self, operand_address):
|
||||
# @@@ doesn't handle BCD yet
|
||||
assert not self.decimal_mode_flag
|
||||
|
||||
|
||||
a2 = self.accumulator
|
||||
a1 = signed(a2)
|
||||
m2 = self.read_byte(operand_address)
|
||||
m1 = signed(m2)
|
||||
|
||||
|
||||
# twos complement subtraction
|
||||
result1 = a1 - m1 - [1, 0][self.carry_flag]
|
||||
|
||||
|
||||
# unsigned subtraction
|
||||
result2 = a2 - m2 - [1, 0][self.carry_flag]
|
||||
|
||||
|
||||
self.accumulator = self.update_nz(result2)
|
||||
self.carry_flag = [0, 1][(result2 >= 0)]
|
||||
|
||||
|
||||
# perhaps this could be calculated from result2 but result1 is more intuitive
|
||||
self.overflow_flag = [0, 1][(result1 > 127) | (result1 < -128)]
|
||||
|
||||
|
||||
# BIT
|
||||
|
||||
|
||||
def BIT(self, operand_address):
|
||||
value = self.read_byte(operand_address)
|
||||
self.sign_flag = ((value >> 7) % 2) # bit 7
|
||||
self.overflow_flag = ((value >> 6) % 2) # bit 6
|
||||
self.zero_flag = [0, 1][((self.accumulator & value) == 0)]
|
||||
|
||||
|
||||
# COMPARISON
|
||||
|
||||
|
||||
def CMP(self, operand_address):
|
||||
result = self.accumulator - self.read_byte(operand_address)
|
||||
self.carry_flag = [0, 1][(result >= 0)]
|
||||
self.update_nz(result)
|
||||
|
||||
|
||||
def CPX(self, operand_address):
|
||||
result = self.x_index - self.read_byte(operand_address)
|
||||
self.carry_flag = [0, 1][(result >= 0)]
|
||||
self.update_nz(result)
|
||||
|
||||
|
||||
def CPY(self, operand_address):
|
||||
result = self.y_index - self.read_byte(operand_address)
|
||||
self.carry_flag = [0, 1][(result >= 0)]
|
||||
self.update_nz(result)
|
||||
|
||||
|
||||
# SYSTEM
|
||||
|
||||
|
||||
def NOP(self):
|
||||
pass
|
||||
|
||||
|
||||
def BRK(self):
|
||||
self.cycles += 5
|
||||
self.push_word(self.program_counter + 1)
|
||||
self.push_byte(self.status_as_byte())
|
||||
self.program_counter = self.read_word(0xFFFE)
|
||||
self.break_flag = 1
|
||||
|
||||
|
||||
def RTI(self):
|
||||
self.cycles += 4
|
||||
self.status_from_byte(self.pull_byte())
|
||||
self.program_counter = self.pull_word()
|
||||
|
||||
|
||||
|
||||
|
||||
# @@@ IRQ
|
||||
# @@@ NMI
|
||||
|
||||
@ -1225,6 +1225,6 @@ if __name__ == "__main__":
|
||||
sys.exit(0)
|
||||
|
||||
mem = Memory(options)
|
||||
|
||||
|
||||
cpu = CPU(options, mem)
|
||||
cpu.run(options.bus)
|
||||
|
||||
208
tests.py
208
tests.py
@ -3,16 +3,16 @@ from cpu6502 import Memory, CPU
|
||||
|
||||
|
||||
class TestMemory(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
|
||||
|
||||
def test_load(self):
|
||||
self.memory.load(0x1000, [0x01, 0x02, 0x03])
|
||||
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
|
||||
self.assertEqual(self.memory.read_byte(None, 0x1001), 0x02)
|
||||
self.assertEqual(self.memory.read_byte(None, 0x1002), 0x03)
|
||||
|
||||
|
||||
def test_write(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x11)
|
||||
self.memory.write_byte(None, 0x1001, 0x12)
|
||||
@ -23,12 +23,12 @@ class TestMemory(unittest.TestCase):
|
||||
|
||||
|
||||
class TestLoadStoreOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])
|
||||
|
||||
|
||||
def test_LDA(self):
|
||||
self.cpu.LDA(0x1000)
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
@ -50,7 +50,7 @@ class TestLoadStoreOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_LDX(self):
|
||||
self.cpu.LDX(0x1000)
|
||||
self.assertEqual(self.cpu.x_index, 0x00)
|
||||
@ -72,7 +72,7 @@ class TestLoadStoreOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.x_index, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_LDY(self):
|
||||
self.cpu.LDY(0x1000)
|
||||
self.assertEqual(self.cpu.y_index, 0x00)
|
||||
@ -94,17 +94,17 @@ class TestLoadStoreOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.y_index, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_STA(self):
|
||||
self.cpu.accumulator = 0x37
|
||||
self.cpu.STA(0x2000)
|
||||
self.assertEqual(self.memory.read_byte(None, 0x2000), 0x37)
|
||||
|
||||
|
||||
def test_STX(self):
|
||||
self.cpu.x_index = 0x38
|
||||
self.cpu.STX(0x2000)
|
||||
self.assertEqual(self.memory.read_byte(None, 0x2000), 0x38)
|
||||
|
||||
|
||||
def test_STY(self):
|
||||
self.cpu.y_index = 0x39
|
||||
self.cpu.STY(0x2000)
|
||||
@ -112,11 +112,11 @@ class TestLoadStoreOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestRegisterTransferOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_TAX(self):
|
||||
self.cpu.accumulator = 0x00
|
||||
self.cpu.TAX()
|
||||
@ -133,7 +133,7 @@ class TestRegisterTransferOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.x_index, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_TAY(self):
|
||||
self.cpu.accumulator = 0x00
|
||||
self.cpu.TAY()
|
||||
@ -150,7 +150,7 @@ class TestRegisterTransferOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.y_index, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_TXA(self):
|
||||
self.cpu.x_index = 0x00
|
||||
self.cpu.TXA()
|
||||
@ -167,7 +167,7 @@ class TestRegisterTransferOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_TYA(self):
|
||||
self.cpu.y_index = 0x00
|
||||
self.cpu.TYA()
|
||||
@ -187,22 +187,22 @@ class TestRegisterTransferOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestStackOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_TSX(self):
|
||||
s = self.cpu.stack_pointer
|
||||
self.cpu.TSX()
|
||||
self.assertEqual(self.cpu.x_index, s)
|
||||
# @@@ check NZ?
|
||||
|
||||
|
||||
def test_TXS(self):
|
||||
x = self.cpu.x_index
|
||||
self.cpu.TXS()
|
||||
self.assertEqual(self.cpu.stack_pointer, x)
|
||||
|
||||
|
||||
def test_PHA_and_PLA(self):
|
||||
self.cpu.accumulator = 0x00
|
||||
self.cpu.PHA()
|
||||
@ -225,7 +225,7 @@ class TestStackOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
|
||||
|
||||
def test_PHP_and_PLP(self):
|
||||
p = self.cpu.status_as_byte()
|
||||
self.cpu.PHP()
|
||||
@ -235,11 +235,11 @@ class TestStackOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestLogicalOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_AND(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x37)
|
||||
self.cpu.accumulator = 0x34
|
||||
@ -252,7 +252,7 @@ class TestLogicalOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
|
||||
|
||||
def test_EOR(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x37)
|
||||
self.cpu.accumulator = 0x34
|
||||
@ -270,7 +270,7 @@ class TestLogicalOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
|
||||
|
||||
def test_ORA(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x37)
|
||||
self.cpu.accumulator = 0x34
|
||||
@ -288,7 +288,7 @@ class TestLogicalOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
|
||||
|
||||
def test_BIT(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x00)
|
||||
self.cpu.accumulator = 0x00
|
||||
@ -323,15 +323,15 @@ class TestLogicalOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestArithmeticOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_ADC_without_BCD(self):
|
||||
|
||||
|
||||
## test cases from http://www.6502.org/tutorials/vflag.html
|
||||
|
||||
|
||||
# 1 + 1 = 2 (C = 0; V = 0)
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x01
|
||||
@ -340,7 +340,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x02)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 0)
|
||||
|
||||
|
||||
# 1 + -1 = 0 (C = 1; V = 0)
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x01
|
||||
@ -349,7 +349,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
self.assertEqual(self.cpu.overflow_flag, 0)
|
||||
|
||||
|
||||
# 127 + 1 = 128 (C = 0; V = 1)
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x7F
|
||||
@ -358,7 +358,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x80) # @@@
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1)
|
||||
|
||||
|
||||
# -128 + -1 = -129 (C = 1; V = 1)
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x80
|
||||
@ -367,7 +367,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x7F) # @@@
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1)
|
||||
|
||||
|
||||
# 63 + 64 + 1 = 128 (C = 0; V = 1)
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.accumulator = 0x3F
|
||||
@ -376,7 +376,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x80)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1)
|
||||
|
||||
|
||||
def test_SBC_without_BCD(self):
|
||||
self.cpu.accumulator = 0x02
|
||||
self.memory.write_byte(None, 0x1000, 0x01)
|
||||
@ -384,16 +384,16 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x00)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
self.assertEqual(self.cpu.overflow_flag, 0)
|
||||
|
||||
|
||||
self.cpu.accumulator = 0x01
|
||||
self.memory.write_byte(None, 0x1000, 0x02)
|
||||
self.cpu.SBC(0x1000)
|
||||
self.assertEqual(self.cpu.accumulator, 0xFF)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 0) # @@@
|
||||
|
||||
|
||||
## test cases from http://www.6502.org/tutorials/vflag.html
|
||||
|
||||
|
||||
# 0 - 1 = -1 (V = 0)
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.accumulator = 0x00
|
||||
@ -402,7 +402,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0xFF)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 0) # @@@
|
||||
|
||||
|
||||
# -128 - 1 = -129 (V = 1)
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.accumulator = 0x80
|
||||
@ -411,7 +411,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x7F)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1)
|
||||
|
||||
|
||||
# 127 - -1 = 128 (V = 1)
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.accumulator = 0x7F
|
||||
@ -420,7 +420,7 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x80)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1)
|
||||
|
||||
|
||||
# -64 -64 -1 = -129 (V = 1)
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0xC0
|
||||
@ -429,9 +429,9 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.accumulator, 0x7F)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
self.assertEqual(self.cpu.overflow_flag, 1) # @@@
|
||||
|
||||
|
||||
## @@@ BCD versions still to do
|
||||
|
||||
|
||||
def test_CMP(self):
|
||||
self.cpu.accumulator = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x09)
|
||||
@ -439,35 +439,35 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.accumulator = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0B)
|
||||
self.cpu.CMP(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
self.cpu.accumulator = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CMP(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.accumulator = 0xA0
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CMP(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.accumulator = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0xA0)
|
||||
self.cpu.CMP(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 0) # @@@
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
def test_CPX(self):
|
||||
self.cpu.x_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x09)
|
||||
@ -475,35 +475,35 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.x_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0B)
|
||||
self.cpu.CPX(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
self.cpu.x_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CPX(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.x_index = 0xA0
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CPX(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.x_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0xA0)
|
||||
self.cpu.CPX(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 0) # @@@
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
def test_CPY(self):
|
||||
self.cpu.y_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x09)
|
||||
@ -511,28 +511,28 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.y_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0B)
|
||||
self.cpu.CPY(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
self.cpu.y_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CPY(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.y_index = 0xA0
|
||||
self.memory.write_byte(None, 0x1000, 0x0A)
|
||||
self.cpu.CPY(0x1000)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
self.cpu.y_index = 0x0A
|
||||
self.memory.write_byte(None, 0x1000, 0xA0)
|
||||
self.cpu.CPY(0x1000)
|
||||
@ -542,11 +542,11 @@ class TestArithmeticOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_INC(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x00)
|
||||
self.cpu.INC(0x1000)
|
||||
@ -563,7 +563,7 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
|
||||
|
||||
def test_INX(self):
|
||||
self.cpu.x_index = 0x00
|
||||
self.cpu.INX()
|
||||
@ -580,7 +580,7 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.x_index, 0x00)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
|
||||
|
||||
def test_INY(self):
|
||||
self.cpu.y_index = 0x00
|
||||
self.cpu.INY()
|
||||
@ -597,7 +597,7 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.y_index, 0x00)
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
|
||||
|
||||
def test_DEC(self):
|
||||
self.memory.write_byte(None, 0x1000, 0x01)
|
||||
self.cpu.DEC(0x1000)
|
||||
@ -614,7 +614,7 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
self.assertEqual(self.memory.read_byte(None, 0x1000), 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_DEX(self):
|
||||
self.cpu.x_index = 0x01
|
||||
self.cpu.DEX()
|
||||
@ -631,7 +631,7 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.x_index, 0xFF)
|
||||
self.assertEqual(self.cpu.sign_flag, 1)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
|
||||
|
||||
def test_DEY(self):
|
||||
self.cpu.y_index = 0x01
|
||||
self.cpu.DEY()
|
||||
@ -651,11 +651,11 @@ class TestIncrementDecrementOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestShiftOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_ASL(self):
|
||||
self.cpu.accumulator = 0x01
|
||||
self.cpu.ASL()
|
||||
@ -675,7 +675,7 @@ class TestShiftOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 1)
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
def test_LSR(self):
|
||||
self.cpu.accumulator = 0x01
|
||||
self.cpu.LSR()
|
||||
@ -695,7 +695,7 @@ class TestShiftOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 0)
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
def test_ROL(self):
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x80
|
||||
@ -725,7 +725,7 @@ class TestShiftOperations(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.sign_flag, 0)
|
||||
self.assertEqual(self.cpu.zero_flag, 0) # @@@
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
def test_ROR(self):
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.accumulator = 0x01
|
||||
@ -758,29 +758,29 @@ class TestShiftOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestJumpCallOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_JMP(self):
|
||||
self.cpu.JMP(0x1000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x1000)
|
||||
|
||||
|
||||
def test_JSR(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.JSR(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), 0xFF)
|
||||
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x0F)
|
||||
|
||||
|
||||
def test_RTS(self):
|
||||
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
|
||||
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
|
||||
self.cpu.stack_pointer = 0xFD
|
||||
self.cpu.RTS()
|
||||
self.assertEqual(self.cpu.program_counter, 0x1234)
|
||||
|
||||
|
||||
def test_JSR_and_RTS(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.JSR(0x2000)
|
||||
@ -790,11 +790,11 @@ class TestJumpCallOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestBranchOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_BCC(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.carry_flag = 1
|
||||
@ -804,7 +804,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.BCC(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BCS(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.carry_flag = 0
|
||||
@ -814,7 +814,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.BCS(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BEQ(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.zero_flag = 0
|
||||
@ -824,7 +824,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.zero_flag = 1
|
||||
self.cpu.BEQ(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BMI(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.sign_flag = 0
|
||||
@ -834,7 +834,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.sign_flag = 1
|
||||
self.cpu.BMI(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BNE(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.zero_flag = 1
|
||||
@ -844,7 +844,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.zero_flag = 0
|
||||
self.cpu.BNE(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BPL(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.sign_flag = 1
|
||||
@ -854,7 +854,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.sign_flag = 0
|
||||
self.cpu.BPL(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BVC(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.overflow_flag = 1
|
||||
@ -864,7 +864,7 @@ class TestBranchOperations(unittest.TestCase):
|
||||
self.cpu.overflow_flag = 0
|
||||
self.cpu.BVC(0x2000)
|
||||
self.assertEqual(self.cpu.program_counter, 0x2000)
|
||||
|
||||
|
||||
def test_BVS(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.cpu.overflow_flag = 0
|
||||
@ -877,41 +877,41 @@ class TestBranchOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestStatusFlagOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_CLC(self):
|
||||
self.cpu.carry_flag = 1
|
||||
self.cpu.CLC()
|
||||
self.assertEqual(self.cpu.carry_flag, 0)
|
||||
|
||||
|
||||
def test_CLD(self):
|
||||
self.cpu.decimal_mode_flag = 1
|
||||
self.cpu.CLD()
|
||||
self.assertEqual(self.cpu.decimal_mode_flag, 0)
|
||||
|
||||
|
||||
def test_CLI(self):
|
||||
self.cpu.interrupt_disable_flag = 1
|
||||
self.cpu.CLI()
|
||||
self.assertEqual(self.cpu.interrupt_disable_flag, 0)
|
||||
|
||||
|
||||
def test_CLV(self):
|
||||
self.cpu.overflow_flag = 1
|
||||
self.cpu.CLV()
|
||||
self.assertEqual(self.cpu.overflow_flag, 0)
|
||||
|
||||
|
||||
def test_SEC(self):
|
||||
self.cpu.carry_flag = 0
|
||||
self.cpu.SEC()
|
||||
self.assertEqual(self.cpu.carry_flag, 1)
|
||||
|
||||
|
||||
def test_SED(self):
|
||||
self.cpu.decimal_mode_flag = 0
|
||||
self.cpu.SED()
|
||||
self.assertEqual(self.cpu.decimal_mode_flag, 1)
|
||||
|
||||
|
||||
def test_SEI(self):
|
||||
self.cpu.interrupt_disable_flag = 0
|
||||
self.cpu.SEI()
|
||||
@ -919,11 +919,11 @@ class TestStatusFlagOperations(unittest.TestCase):
|
||||
|
||||
|
||||
class TestSystemFunctionOperations(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_BRK(self):
|
||||
self.cpu.program_counter = 0x1000
|
||||
self.memory.rom.load(0xFFFE, [0x00, 0x20])
|
||||
@ -934,7 +934,7 @@ class TestSystemFunctionOperations(unittest.TestCase):
|
||||
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), status)
|
||||
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x01)
|
||||
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 3), 0x10)
|
||||
|
||||
|
||||
def test_RTI(self):
|
||||
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
|
||||
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
|
||||
@ -943,17 +943,17 @@ class TestSystemFunctionOperations(unittest.TestCase):
|
||||
self.cpu.RTI()
|
||||
self.assertEqual(self.cpu.program_counter, 0x1233)
|
||||
self.assertEqual(self.cpu.status_as_byte(), 0x20)
|
||||
|
||||
|
||||
def test_NOP(self):
|
||||
self.cpu.NOP()
|
||||
|
||||
|
||||
class Test6502Bugs(unittest.TestCase):
|
||||
|
||||
|
||||
def setUp(self):
|
||||
self.memory = Memory(use_bus=False)
|
||||
self.cpu = CPU(self.memory)
|
||||
|
||||
|
||||
def test_zero_page_x(self):
|
||||
self.cpu.x_index = 0x01
|
||||
self.memory.load(0x1000, [0x00, 0x7F, 0xFF])
|
||||
@ -961,7 +961,7 @@ class Test6502Bugs(unittest.TestCase):
|
||||
self.assertEqual(self.cpu.zero_page_x_mode(), 0x01)
|
||||
self.assertEqual(self.cpu.zero_page_x_mode(), 0x80)
|
||||
self.assertEqual(self.cpu.zero_page_x_mode(), 0x00)
|
||||
|
||||
|
||||
def test_indirect(self):
|
||||
self.memory.load(0x20, [0x00, 0x20])
|
||||
self.memory.load(0x00, [0x12])
|
||||
@ -971,29 +971,29 @@ class Test6502Bugs(unittest.TestCase):
|
||||
self.memory.load(0x2000, [0x05])
|
||||
self.memory.load(0x1234, [0x05])
|
||||
self.memory.load(0x2345, [0x00, 0xF0])
|
||||
|
||||
|
||||
self.cpu.program_counter = 0x1000
|
||||
|
||||
|
||||
self.cpu.x_index = 0x00
|
||||
self.cpu.LDA(self.cpu.indirect_x_mode())
|
||||
self.assertEqual(self.cpu.accumulator, 0x05)
|
||||
|
||||
|
||||
self.cpu.y_index = 0x00
|
||||
self.cpu.LDA(self.cpu.indirect_y_mode())
|
||||
self.assertEqual(self.cpu.accumulator, 0x05)
|
||||
|
||||
|
||||
self.cpu.y_index = 0x00
|
||||
self.cpu.LDA(self.cpu.indirect_y_mode())
|
||||
self.assertEqual(self.cpu.accumulator, 0x05)
|
||||
|
||||
|
||||
self.cpu.x_index = 0x00
|
||||
self.cpu.LDA(self.cpu.indirect_x_mode())
|
||||
self.assertEqual(self.cpu.accumulator, 0x05)
|
||||
|
||||
|
||||
self.cpu.x_index = 0xFF
|
||||
self.cpu.LDA(self.cpu.indirect_x_mode())
|
||||
self.assertEqual(self.cpu.accumulator, 0x05)
|
||||
|
||||
|
||||
self.assertEqual(self.cpu.indirect_mode(), 0xF000)
|
||||
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user