Presume that the Heathkit PAM is like the Morrow Keyed-Up 8080? (e.g., see: https://archive.org/details/bitsavers_morrowsche77_699793). Depends on ROM+CPU for keypad support. The idea here is CPU-independence, which would be the way to go. But as John notes (later) probably will take a new board to accommodate the necessary circuitry -- the functionality isn't all *that* complicated, but it's still non-trivial to substitute for that CPU+ROM and "simple program".
Perhaps we could treat the keypad-function as a self-contained pendant (thus gaining space off-S100-board), but then one needs to deal with a lot of data/address long-lines that need to be buffered close to the backplane. Could replace the long-lines with a serial protocol with shift registers at both ends? Getting complicated ... On Thu, Feb 19, 2015 at 7:59 PM, Richard Cini <[email protected]> wrote: > How about like the Heathkit PAM or 11/34a ODT. Not sure if the PAM used > another CPU. The 11/34 used a 4004 but I'm sure there are other methods. > > Sent from my iPhone > > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
