If you're
lucky, eitehr th microcontroller is old enough not to
have any
security features, or they're not used. In which case you remove
the chip
from the PCB and stick it in a suitable programmer.
Even the original Intel 8051/8751, circa 1980, has security
bits. :-( There are ways to get around (at least) those, though.
Yes, but IIRC the 8048 series (common in classic computer stuff) doesn't...
-tony