> an IC next to a 7 seg LED display on an old bit of veroboard.
> The markings are all faded badly.
> I'm assuming it is some sort of BCD to 7 seg driver or something
> similar.
> The marking could be:
> DM74S238 or something similar.
> Anton, I think it is a small fusible link PROM, in TTL family.

They were briefly used like PALs, before PALs etc took over.

I have seen them used where you need to hold a few bits of data,
such as Ethernet addresses, or need a very fast small ROM.