Identifies the version of a given MEGA65 ROM file

whichrom.py

#!/usr/bin/env python

import sys

PREFIX = b'\x42\x41\x53\x49\x43\x20\x36\x35\x20'


def main(args):
    if len(args) != 1:
        print('Usage: python3 whichrom.py mega65.rom')
        return 1
    dat = open(args[0], 'rb').read()
    i = dat.find(PREFIX)
    if i == -1:
        print(
            f'Could not find ROM version prefix. '
            f'Is {args[1]} a MEGA65 ROM file?')
        return 1
    i += len(PREFIX) + 1
    print(str(dat[i:i + 6], encoding='ascii'))


if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))