def cpuTick(self):
# let's pretend the clock doesn't exist for now
if self.nmiPending:
self.interrupt(mem.VEC_NMI)
self.nmiPending = False
elif self.irqPending and not self.flag(FLAG_I):
self.interrupt(mem.VEC_IRQ)
self.irqPending = False
# TODO also process RST here (if I feel like it)
self.currentInstruction = self.PC
instr = opc.instrFromAddr(self.PC, self)
self.PC = instr.nextaddr
# TODO this next line can't account for variable cycle counts
self.excessCycles += instr.cycles
instr.call(self)
self.excessCycles += self.instructionCycleExtra
self.instructionCycleExtra = 0
def printState(self):
print ("A = %02x X = %02x Y = %02x SP=%02x flags = %02x PC = %04x" %
(self.reg_A, self.reg_X, self.reg_Y, self.SP, self.flags, self.PC))
instr = opc.instrFromAddr(self.PC, self)
print instr.disassemble()
# ROMFILE = 'instr_test-v4/official_only.nes'
# # unfortunately, the rom singles use unofficial instructions
# ROMFILE = 'instr_test-v4/rom_singles/02-implied.nes'
# STARTADDR = None
# ROMFILE = 'donkeykong.nes'
# STARTADDR = None
ROMFILE = 'smb.nes'
STARTADDR = None
nestestrom = rom.readRom(ROMFILE)
c = cpu.CPU(rom=nestestrom)
startaddr = c.mem.dereference(mem.VEC_RST)
startop = opc.instrFromAddr(startaddr, c)
firstops = opc.instrListFromAddr(startaddr, 50, c)
firstassem = "\n".join([op.disassemble() for op in firstops])
if STARTADDR is not None:
c.PC = STARTADDR
c.printState()
def run(delay=0):
instructions = 0
try:
while True:
c.tick()
instructions += 1
time.sleep(delay)
finally: