Bill Garber wrote:
Wayne, The PROM on your disk controller is the 74SO125N. That IS a 256 byte PROM. I couldn't find it per se, but after searching for all the different PROMs used on the Apple 5.25 controller at the 341-0027 location, I was finally able to cross reference it to the prom on your JMR board. Whew, now I feel better. I thought someone did some magic there or something.
Hm, the information I have seem to indicate that the74SO125N is a Quad tri-state buffer Wayne