Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!hercules!fernwood!portal!cup.portal.com!Michael_J_Ward
From: Michael_J_Ward@cup.portal.com
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac IIfx vs CD-ROM update
Message-ID: <36485@cup.portal.com>
Date: 3 Dec 90 05:50:32 GMT
References: <1990Nov28.171308.21808@athena.mit.edu>
  <1990Nov30.042123.555@rodan.acs.syr.edu>
Organization: The Portal System (TM)
Lines: 11

Per my earlier message on incompatibilities of the fx and the apple cd-rom
drive, mail fell into two camps: one had the cd drive connected directly to
the fx and had no problems, and the other had other items on the SCSI bus and
had loads of problems. Apple's official "fix" is to try different lengths of
SCSI cables between the devices. 
     Clearly they are having problems with reflections and/or impedance
mismatches between the devices and the terminations. These show up as 
resonances in the cables and may be worked around by selecting lengths of 
SCSI cable which do not aggravate the mismatch.
     I connected my cd-rom drive directly to the fx and have had no problems.
Perhaps Apple would like to say something further to us...