Programming Bipolar PROMs

[Mike Stein]

... and also has many rare ones in stock; reasonable prices, good guy!

On Mon, Sep 27, 2021 at 11:38 PM ben via cctalk <cctalk at classiccmp.org>
wrote:

> On 2021-09-27 9:23 a.m., 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)?
> >
> > Thanks and best regards
> > Tom Hunter
> >
> http://www.eprompro.com/Index.html
> Does PROMS.
> Ben.
>
>