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From: dlc@lanl.ARPA (Dale Carstensen)
Newsgroups: net.micro.mac
Subject: Re: jerky screen animation with SCSI disk
Message-ID: <8500@lanl.ARPA>
Date: Sat, 11-Oct-86 20:57:49 EDT
Article-I.D.: lanl.8500
Posted: Sat Oct 11 20:57:49 1986
Date-Received: Fri, 17-Oct-86 07:24:08 EDT
Distribution: net
Organization: Los Alamos National Laboratory
Lines: 7

I was wrong in my suggestion that the jerky timing might have been due to a
Vertical Blanking Interrupt queue entry.  The SCSI Bernoulli Box drive has
such an entry only because it has to detect cartridge insertion.  Any non-
removable drives would probably not have VB entries.  However, the Delphi
suggestion that a dNeedTime entry in the driver control table was set at
boot time to catch the existence of the drive after the boot is completed,
but never cleared after the catch, may explain the behaviour.