ID UV erasable PROMS used on an IBM PC board?

[Jon Elson]

On 3/20/22 20:59, D. Resor via cctalk wrote:
> I cannot find a datasheet by any of the numbers silkscreened on these ICs.
>
> Could these be proprietary IBM P/N numbers?
Yes, they are.  But, very likely standard 27xx series of 
EPROMS, all you need to know are how many address bits there 
are and you should be able to cross-refence them to standard 
Intel EPROMs.
>
> https://www.dropbox.com/s/f6rvemx9ldbbv5x/EPROMS1.jpg?dl=0
>
Jon