Programming Bipolar PROMs

On 2021-Sep-27, at 8:23 AM, Tom Hunter via cctalk wrote: > 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)?

... Details of the 74S188 programming/burn algorithm is in the 1975 TI Memory Databook for Design Engineers (available at bitsavers) (I expect the 188 is the most likely type you'll find NOS today).