The dies look to have consistent wire bonding. That would mean they are one of 
the standard EPROMs made by Intel, just preprogrammed by Intel before shipping. 
The numbers wouldn't be intel numbers they would be IBMs inventory numbers. My 
guess is that they are 2732s. You might use a microscope and look at the edges 
of the dies. They often have the die type in the metal layers around the edge 
some place. Avoid using florescent ring lights as a large amount of UVC leaks 
from these. White LED are or incandescent lights.
Also power it up and note which pins look to have signals. if any of the lines 
have what looks like a constant voltage measure it to the nearest .01 volts if 
you can. That will help determine if it is driven by a signal or a hard tied 
wire. Lower left and upper right should be ground and power pins.
Dwight


________________________________
From: cctalk <cctalk-boun...@classiccmp.org> on behalf of D. Resor via cctalk 
<cctalk@classiccmp.org>
Sent: Sunday, March 20, 2022 6:53 PM
To: 'General Discussion: On-Topic and Off-Topic Posts' <cctalk@classiccmp.org>
Subject: ID UV erasable PROMS used on an IBM PC board?

I cannot find a datasheet by any of the numbers silkscreened on these ICs.

Could these be proprietary IBM P/N numbers?

https://www.dropbox.com/s/f6rvemx9ldbbv5x/EPROMS1.jpg?dl=0

No need for a Dropbox account, close the login pop up and you can view the
image.

Thanks

Don Resor


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