While restoring and repairing a Data General Nova 2/10 I found a bad bipolar PROM on the CPU board. The PROM has open-collector outputs and is organized as 32 words by 8 bits. It appears that one of the open-collector driver transistors is faulty (but it could also be that a fuse has "healed").
The part is an Intersil IM5600CP, but these were also made by others, for example Signetics and Philips made the 82S23 and TI and NTE made the faster SN74S188N. Some vendors still sell these parts and there are even a few on Ebay. How do I program these PROMs? I found one somewhat obscure description of the algorithm in the NTE datasheet, but I suspect that each manufacturer had (somewhat) different algorithms. Is there an affordable commercial programmer out there which can program these PROMs? Is there a simple design out there which I could breadboard for a one-off programming job (maybe using an Arduino to control the programming sequence)? Thanks and best regards Tom Hunter
