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Implemented all STZ for 65C02. Trying out new idea for instruction definitions.

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Signed-off-by: Mike Naberezny <mike@naberezny.com>
This commit is contained in:
Oscar Lindberg 2009-04-08 05:42:56 +08:00 committed by Mike Naberezny
parent f1d553a485
commit aa8ef0ebca
1 changed files with 31 additions and 8 deletions
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39
src/py65/mpu65c02.py
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@ -1,26 +1,49 @@
#from py65.utils.conversions import convert_to_bin, convert_to_bcd
import mpu6502
def make_instruction_decorator(instruct, cycletime, extracycles):
def instruction(opcode, opcycles, opextracycles=0):
def decorate(f):
instruct[opcode] = f
cycletime[opcode] = opcycles
extracycles[opcode] = opextracycles
return f # Return the original function
return decorate
return instruction
class MPU(mpu6502.MPU):
def __init__(self, memory=None, pc=0x0000, debug=False):
mpu6502.MPU.__init__(self, memory=memory, pc=pc, debug=debug)
self.name = '65C02'
instruct = mpu6502.MPU.instruct[:]
cycletime = mpu6502.MPU.cycletime[:]
extracycles = mpu6502.MPU.extracycles[:]
instruction = \
make_instruction_decorator(instruct, cycletime, extracycles)
def opSTZ(self, x):
self.memory[x()] = 0x00
@instruction(0x64, 3)
def i64(self):
self.opSTZ(self.ZeroPageAddr)
self.pc += 1
# code pages
@instruction(0x74, 4)
def i74(self):
self.opSTZ(self.ZeroPageXAddr)
self.pc += 1
instruct = mpu6502.MPU.instruct[:]
instruct[0x64] = i64
@instruction(0x9c, 4)
def i9c(self):
self.opSTZ(self.AbsoluteAddr)
self.pc += 2
cycletime = mpu6502.MPU.cycletime[:]
cycletime[0x64] = 3
extracycles = mpu6502.MPU.extracycles[:]
extracycles[0x64] = 0
@instruction(0x9e, 5)
def i9e(self):
self.opSTZ(self.AbsoluteXAddr)
self.pc+=2