8080exer.py

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"""Run 8080EX1 to test emulation correctness."""


import datetime
import time

from virtual8080 import Virtual8080
from virtual_device import VirtualDevice


class StubIO(VirtualDevice):

    def get_input(self, port_addr: int) -> int:
        return 0

    def send_output(self, port_addr: int, value: int) -> None:
        ch = value & 0b01111111
        print(bytes([ch]).decode(encoding='ascii'), end='', flush=True)


def run(program_file: str, bdos_file: str) -> None:
    vm = Virtual8080()
    vm.io = StubIO()

    with open(program_file, 'r') as f:
        program = f.read()
    vm.load_hex(program)

    with open(bdos_file, 'r') as f:
        bdos = f.read()
    vm.load_hex(bdos)

    vm.registers['pc'] = 0x0100 
    vm.run()


if __name__ == '__main__':
    program_file = './8080exer/8080EX1.HEX'
    bdos_file = './8080exer/bdos-emu.hex'

    start_time = time.time()
    start_time_str = time.strftime('%H:%M:%S', time.localtime(start_time))
    print(f'Starting the exerciser at {start_time_str}. This is going to take'
           ' a while.\n')

    run(program_file, bdos_file)

    end_time = time.time()
    end_time_str = time.strftime('%H:%M:%S', time.localtime(end_time))
    elapsed_time = datetime.timedelta(seconds=(end_time - start_time))
    print(f'\n\nFinished at {end_time_str} (elapsed time: {elapsed_time}).')