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- Fixed bug in relative branch calculations.

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- General cleanup.
This commit is contained in:
Mike Naberezny 2008-09-07 05:43:27 +00:00
parent db55b300fe
commit 8c2c57ad82
1 changed files with 13 additions and 16 deletions
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29
mpu.py
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@ -18,8 +18,6 @@ class MPU:
def __init__(self):
# config
self.debug = False
self.externalLoop = True
self.stopOnIterrupt = True
# vm status
self.breakFlag = False
@ -58,16 +56,15 @@ class MPU:
self.processorCycles=0
def clearMemory(self, start=0x0000, end=0xFFFF):
self.memory = self.RAM = []
self.memory = []
for addr in range(start, end + 1):
self.memory.insert(addr, 0x00)
def ByteAt(self, addr):
return self.memory[addr]
def WordAt(self, addr):
return self.ByteAt(addr) + self.ByteAt(0xffff&(addr+1))*256
return self.ByteAt(addr) + (self.ByteAt(addr + 1) << 8)
def ImmediateByte(self):
return self.ByteAt(self.pc)
@ -123,7 +120,7 @@ class MPU:
self.pc += 1
if addr & 128:
addr = self.pc - (addr ^ 0xFF) + 1
addr = self.pc - (addr ^ 0xFF) - 1
else:
addr = self.pc + addr
@ -135,7 +132,7 @@ class MPU:
# stack
def stPush(self,z):
self.RAM[self.sp+256] = z&255
self.memory[self.sp+256] = z&255
self.sp -= 1
self.sp &= 255
@ -180,7 +177,7 @@ class MPU:
else:
self.flags |= self.ZERO
self.RAM[addr] = tbyte
self.memory[addr] = tbyte
def opLSR(self, x):
addr = x()
@ -193,7 +190,7 @@ class MPU:
pass # {}
else:
self.flags |= self.ZERO
self.RAM[addr]=tbyte
self.memory[addr]=tbyte
def opBCL(self, x):
if self.flags & x:
@ -238,7 +235,7 @@ class MPU:
self.flags |= self.CARRY
tbyte = tbyte << 1
self.FlagsNZ(tbyte)
self.RAM[addr] = tbyte & 0xFF
self.memory[addr] = tbyte & 0xFF
def opEOR(self, x):
self.a ^= self.ByteAt(x())
@ -292,16 +289,16 @@ class MPU:
self.flags |= self.CARRY
tbyte=tbyte>>1
self.FlagsNZ(tbyte)
self.RAM[addr]=tbyte
self.memory[addr]=tbyte
def opSTA(self, x):
self.RAM[x()] = self.a
self.memory[x()] = self.a
def opSTY(self, x):
self.RAM[x()] = self.y
self.memory[x()] = self.y
def opSTX(self, y):
self.RAM[y()] = self.x
self.memory[y()] = self.x
def opCPY(self, x):
tbyte=self.ByteAt(x())
@ -377,7 +374,7 @@ class MPU:
self.flags |= tbyte & self.NEGATIVE
else:
self.flags |= self.ZERO
self.RAM[addr] = tbyte
self.memory[addr] = tbyte
def opINCR(self, x):
addr = x()
@ -388,7 +385,7 @@ class MPU:
self.flags |= tbyte & self.NEGATIVE
else:
self.flags |= self.ZERO
self.RAM[addr] = tbyte
self.memory[addr] = tbyte
def opLDA(self, x):
self.a = self.ByteAt(x())