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Re: [N8VEM-S100:6365] A V3 version of our S100 bus System Monitor Board
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- Subject: Re: [N8VEM-S100:6365] A V3 version of our S100 bus System Monitor Board
- From: Paul Birkel <pbi...@gmail.com>
- Date: Fri, 20 Feb 2015 02:42:53 -0500
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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 ...