IBM Logic IC equivalency information needed

Christian Corti cc at
Sat Jun 12 03:54:29 CDT 2021

On Fri, 11 Jun 2021, Santo Nucifora wrote:
> I am currently working on an IBM 5100 that has some issues. I know for
> certain that the 5100 has a bad graphics controller card so I need to dig
> into component level replacements for those ICs I can replace. I have a
> list of logic chip equivalents to the IBM part numbers that are written on
> the chips but I don't think it's 100% accurate because IBM part number
> 1582601 comes back as 74151 "DATA SEL/MUX" but when I use one of those
> cheap logic chip testers (that is surprisingly accurate), it comes back as
> a 74157. For the record, if I test a 74151, it comes back as a 74151 so the
> tester is correct. I just want to make sure the table I have is accurate
> and that the tester is not 100% accurate or if that chip has failed and
> tests like a 74157 in it's state.
> This is the current list I am using that I got from somewhere but I don't
> recall where:
> Does anyone have an IBM logic chip equivalency table for 74 series logic
> chips?

This list looks like a faulty transcription of my list here:

In my list, it is "1582601 74157 DATA SEL/MUX".
This list came from some IBM internal copies with unknown source.


More information about the cctalk mailing list