Thank you for the quick reply. As soon as you wrote that, I checked my list again and I have two entries for 74151. The other is 2392121 which I assume is the right one?
Would you mind sharing your list? I can cross-reference and see how accurate mine is. Thanks again, Santo On Fri, Jun 11, 2021 at 4:29 PM Paul Berger via cctalk < cctalk@classiccmp.org> wrote: > My reliable list says your cheap logic tester is right 1582601 = 74157 > > Paul. > > On 2021-06-11 5:22 p.m., Santo Nucifora via cctalk 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: > > https://vintagecomputer.ca/ibm-vintage-logic-chip-equivalency-list/ > > Does anyone have an IBM logic chip equivalency table for 74 series logic > > chips? > > > > Any help is much appreciated. > > Santo >