IBM Logic IC equivalency information needed

Santo Nucifora santo.nucifora at
Sat Jun 12 06:01:11 CDT 2021

Thanks for that link Christian.

I've seen your list before but couldn't find it and the website I got this
transcribed list from is long gone.  I'll check your list against what I
have and make sure the one I have posted is accurate and post a link to
yours, if that's okay.


On Sat, Jun 12, 2021 at 4:54 AM Christian Corti via cctalk <
cctalk at> wrote:

> 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.
> Christian

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