Apple-2-Tools/applepy
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implemented speaker; not a bad hack :-)

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This commit is contained in:
James Tauber 2011-08-15 02:22:58 -04:00
parent 35c0e69991
commit 4dd414dea8
1 changed files with 42 additions and 5 deletions
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47
applepy.py
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@ -3,6 +3,7 @@
# originally written 2001, updated 2011
import numpy
import pygame
import colorsys
@ -238,6 +239,30 @@ class Display:
del pixels
class Speaker:
CPU_CYCLES_PER_SAMPLE = 70
CHECK_INTERVAL = 1000
def __init__(self):
pygame.mixer.pre_init(44100, -16, 1)
pygame.init()
self.reset()
def toggle(self, cycle):
if self.last_toggle is not None:
l = (cycle - self.last_toggle) / Speaker.CPU_CYCLES_PER_SAMPLE
self.buffer.extend([0, 0.8] if self.polarity else [0, -0.8])
self.buffer.extend(l * [0.5] if self.polarity else [-0.5])
self.polarity = not self.polarity
self.last_toggle = cycle
def reset(self):
self.last_toggle = None
self.buffer = []
self.polarity = False
class ROM:
def __init__(self, start, size):
@ -267,9 +292,10 @@ class RAM(ROM):
class SoftSwitches:
def __init__(self, display):
def __init__(self, display, speaker):
self.kbd = 0x00
self.display = display
self.speaker = speaker
def read_byte(self, cycle, address):
assert 0xC000 <= address <= 0xCFFF
@ -278,7 +304,8 @@ class SoftSwitches:
elif address == 0xC010:
self.kbd = self.kbd & 0x7F
elif address == 0xC030:
pass # toggle speaker
if self.speaker:
self.speaker.toggle(cycle)
elif address == 0xC050:
self.display.txtclr()
elif address == 0xC051:
@ -302,15 +329,16 @@ class SoftSwitches:
class Memory:
def __init__(self, display=None):
def __init__(self, display=None, speaker=None):
self.display = display
self.speaker = speaker
self.rom = ROM(0xD000, 0x3000)
# available from http://www.easy68k.com/paulrsm/6502/index.html
self.rom.load_file(0xD000, "A2ROM.BIN")
self.ram = RAM(0x0000, 0xC000)
self.softswitches = SoftSwitches(display)
self.softswitches = SoftSwitches(display, speaker)
def load(self, address, data):
if address < 0xC000:
@ -340,6 +368,13 @@ class Memory:
self.display.update(address, value)
if 0x2000 <= address < 0x5FFF and self.display:
self.display.update(address, value)
def update(self, cycle):
if self.speaker.buffer and (cycle - self.speaker.last_toggle) > self.speaker.CHECK_INTERVAL:
sample_array = numpy.array(self.speaker.buffer)
sound = pygame.sndarray.make_sound(sample_array)
sound.play()
self.speaker.reset()
class Disassemble:
@ -774,6 +809,7 @@ class CPU:
update_cycle += 1
if update_cycle >= 1024:
pygame.display.flip()
self.memory.update(self.cycles)
update_cycle = 0
def test_run(self, start, end):
@ -1220,7 +1256,8 @@ class CPU:
if __name__ == "__main__":
display = Display()
mem = Memory(display)
speaker = Speaker()
mem = Memory(display, speaker)
cpu = CPU(mem)
cpu.run()