DEC's first use of PROMs

Charles Dickman chd at
Sat Jun 18 21:50:44 CDT 2016

Well maybe not, but the first in the 23-001A1 sequence of part numbers
was used in the PDP-8/e EAE. I was troubleshooting a problem with an
EAE in which the step counter wouldn't load. There are 2 fusible PROMs
in the circuit and I noticed they are 23-001A1 and 23-002A1.

Maybe there is a 23-000A1.

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