dougg3 wrote:Trash80toHP_Mini wrote:An all discrete gating logic config run over a parallel connection to your "ROMs" keeps the ROM SIMM simple/proc free & small!
Ooh, that's very true! That way I could make a bigger board that wasn't constrained by the SIMM size. I like it! We could put all kinds of cool stuff into it that way.
That's the exact config we used back in '89-'90 to feed info to the four 32k SRAM Chips that "emulated" EPROMs on standard $300 font cards.
Modern EEPROMs (?) and such make the hardware just a tad smaller, the input end of our parallel cable to the ROM emulator was an all discrete logic ISA Card, the Proc & Storage was a friggin' PC and its HDD!
Now you could do it on a slightly oversize ROM Card, but to build your own "PC" for inside the Mac with today's technology is just wild and waaayyyyyy over my head!
Just the LED discussion gives me a headache!
edit: your base card remains as useful as, and not a lot more expensive than, the cards you have running right now.
The feeder card would be an option to be added at any time and the input cable opens up the "system' to development by the rest of the PoAMM contingent of the 68kMLA!