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Path: utzoo!utcsrgv!dudek
From: dudek@utcsrgv.UUCP (Gregory Dudek)
Newsgroups: net.micro.apple
Subject: Re: Apple II/Microsoft Softcard Timing Problems
Message-ID: <4885@utcsrgv.UUCP>
Date: Wed, 11-Jul-84 16:53:01 EDT
Article-I.D.: utcsrgv.4885
Posted: Wed Jul 11 16:53:01 1984
Date-Received: Thu, 12-Jul-84 16:00:12 EDT
References: <1574@sri-arpa.UUCP>
Organization: CSRI, University of Toronto
Lines: 18

Regarding CP/M cards and apple II-type machines, one thing I did not
see mentioned was that you might have power supply 
problems.  Although most TTL stuff as used in Apple ][-style machines
will work with 4.8 volts or so, the z-80 seem to be much more
finickey and require an honest-to-goodness 5 volts.  If you supply
is delivering under 5 volts, it is possible that almost everything
under the sun will work except your z-80 card (or it may work
erratically).  
  If you want to try fixing things yourself, there should be a little
hole in the bottom of the power supply with has a trim-screw underneath
it.  Adjust this while using a voltmeter to check out what you
are doing. 
  (Note also that this must be done while the suppy is connected
to the system -- the supply will fail to operate in a "no-load"
condition.)
-- 
   Gregory Dudek
   {cornell,decvax,ihnp4,linus,utzoo,uw-beaver}!utcsrgv!dudek