7 Jul
1998
7 Jul
'98
8:16 p.m.
My ET-3400 is 99% on its way to living again. I found some 7-seg LEDs
that seem to work, and I've done some simple logic tests that check-out
OK. I still have no ROM for the thing, but that didn't stop any of the
old Altair hackers, so.... How hard would it be (for a software guy) to
replace the ROM with something else, say, a parallel cable from a PC that
fed data through the ROM socket?
The clock is already very slow, 500KHz, I think, but I could slow it to
1HZ if it would help. Could I software decode the address, do whatever
handshaking I need to do from the TTL-levels on LPT1, and emulate a ROM
without buying a ROM emulator?
-- Doug