On Mon, Mar 21, 2022 at 8:25 PM Chuck Guzis via cctalk
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
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.
I suppose one could find representative known Intel samples and compare
the appearance "under
Yes, you are correct. I'm a bad counter. I knew a 2732 was a 24 but suffer from
brain rot. Still it is likely a standard Intel part. At most it may have a pin
swap on something like a select pin.
Measuring the pins, will tell which pins are tied and which are active.
Dwight
They won't be 2732 as the EPROM in the picture has 28 pins, but 2732 is
a 24 pin package 2764, 27128, 27256 and 27512 are all in 28 pin packages.
The 8519602 does look like an IBM house number but unfortunately it is
not listed in the cross reference I have .
I would agree it should be
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
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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
