5 Dec
2008
5 Dec
'08
3:15 p.m.
Tony Duell wrote:
That's just... sick. Beautifully sick :-)
Now, for the next challenge, could it be done without the PROM and RAM ICs?
Gut-feeling is maybe something based around feeding scan codes into a giant
shift register and comparing that to some hard-wired lookup table on the PCB
(in effect a ROM, just without the IC) might be possible. Clock the relevant
data in parallel out of the 'ROM' and...
Tony, it
MAY be possible, but I'm hard pressed to NOT believe in a PS/2
It's certainly possible. After all you can build a processor using only
TTL chip, that was done many, many, times. Rememebr that the 74xxx TTL
family does include some small RAMs and fusible link PROMs :-) So you
could build a processor with data storage (RAM) and program memory
(PROM). And surely you agree the interface is possible using a processor.