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From: ACS19@UHUPVM1.BITNET
Newsgroups: net.micro.atari16
Subject: Power supply
Message-ID: <8605100658.AA12747@ucbvax.Berkeley.EDU>
Date: Fri, 9-May-86 18:04:44 EDT
Article-I.D.: ucbvax.8605100658.AA12747
Posted: Fri May  9 18:04:44 1986
Date-Received: Tue, 13-May-86 01:55:34 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: ACS19%UHUPVM1.BITNET@WISCVM.WISC.EDU
Organization: The ARPA Internet
Lines: 8

The problem which many people have been having when they do the one meg
upgrade was believed to be a bad MMU.  Guess again.  We have found that the
power supply was in fact the root of the problem.  By adding the extra chips,
the power drain was more than could be supplied to the chips, and viola, the
MMU would heat up and burn out.  By increasing the rating of the choke in the
power supply, you can allow greater current to pass through.  We have had
several units not work, but by changing the choke, all was fine.  Take note,
we have done 1 meg upgrades to Rev. A & B boards without problems.