def execute_once(): if traceend is None: if MainCPU.PC == tracestart: Trace.settrace(True) else: Trace.settrace(MainCPU.PC >= tracestart and MainCPU.PC <= traceend) if DisplayCPU.ison(): Trace.trace('%6.6o' % DisplayCPU.DPC) Trace.trace('\t') instruction_cycles = DisplayCPU.execute_one_instruction() Trace.trace('%6.6o\t' % MainCPU.PC) instruction_cycles += MainCPU.execute_one_instruction() Trace.itraceend(DisplayCPU.ison()) __tick_all(instruction_cycles) if not DisplayCPU.ison() and not MainCPU.running: return 0 return instruction_cycles
def i_DSN(): global PC if not DisplayCPU.ison(): PC = (PC + 1) & WORDMASK Trace.itrace('DSN') return 1