27 Sep
2021
27 Sep
'21
10:33 a.m.
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.
--Chuck