Re: 7712 info

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Thu, 18 Jun 2020 21:42:29 +0200 Message-ID: <CAESs-_wZ_jV2O8aPbjAdE9iKoOyhvZpzfm2Ksmy5RBGFMXCd6g_at_mail.gmail.com> · francesco.messineo_at_gmail.com

On Thu, Jun 18, 2020 at 9:36 PM <silverdr_at_wfmh.org.pl> wrote:
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> > As for reliability... They did work, but it seems they don't age well. But that's OK after more than 30 years.
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> Might it be that I mixed something? Like.. RAM chips? I vaguely recall that MOS once made replacements for some otherwise common parts and that didn't go too well in terms of reliability. But can't be sure now if/what those were.
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The only MOS-branded RAMs that I have seen are the MPS6550 1k x 4 bits
static ram, and the MPS2114 1k x 4 bits static ram.
None of the two is particularly reliable, but I do have 78xx
date-coded chips still working fine as of today.

Frank