Programming Bipolar PROMs

Chuck Guzis cclist at
Mon Sep 27 12:33:13 CDT 2021

On 9/27/21 10:05 AM, dwight via cctalk wrote:
> Most of these older fused PROMs are of comparable speed in newer
> EPROMs or E2PROMs. Open collector is a hassle but not too much. One
> can create the needed circuits using surface mount parts for size
> reduction. A hassle but not out of the question. You usually have to
> go to a larger ROM size so it can be used for additional storage with
> a switch or jumper select.
In some cases, if you're handy with logic tables, it's sometimes
possible to program a GAL to act as a bipolar PROM substitute.


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