ID UV erasable PROMS used on an IBM PC board?

Glen Slick glen.slick at
Mon Mar 21 23:17:11 CDT 2022

On Mon, Mar 21, 2022 at 8:25 PM Chuck Guzis via cctalk
<cctalk at> wrote:
> The PROMs are most likely house-labeled Intel commodity parts with
> JEDEC-standard pinouts, so it should be fairly easy, using an EPROM
> reader, to figure out if these are 8KB, 16KB, 32KB or 64KB devices.

Some device programmers can read the manufacturer and device ID codes
from a device, if they are implemented. That would be another way to
check for a Intel standard part.

Intel 2764 - 89h / 02h
Intel 2764A - 89h / 08h
Intel 27C64 - 89h / 07h

Intel 27128 - 89h / 83h
Intel 27128A - 89h / 89h
Intel 27C128 - 89h / FCh

Intel 27256 - 89h / 04h
Intel 27C256 - 89h / 8Ch

Intel 27512 - 89h / 0Dh
Intel 27C512 - 89h / FDh

More information about the cctech mailing list