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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.terminals,comp.sys.att
Subject: Re: AT&T 5620 questions
Message-ID: <12178@smoke.BRL.MIL>
Date: 19 Feb 90 16:17:59 GMT
References: <19704@ea.ecn.purdue.edu> <14223@s.ms.uky.edu>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Followup-To: comp.terminals
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 13

In article <14223@s.ms.uky.edu> david@ms.uky.edu (David Herron -- a slipped disk) writes:
>Ages ago I had someone tell me they simply replaced the memory chips
>and everything just worked.

I think some newer 5620s already had faster timing chips on board,
so that chip didn't need replacement.

>Ages++ ago I tried using the official 1Meg upgrade to upgrade "my" 5620.
>Oops..  didn't work.  And we didn't try tracking down what was wrong.

It worked fine for us, on a couple of dozen 5620s.
Maybe you didn't ground yourself before working with the static-sensitive
chips?