Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!ncar!midway!galton.uchicago.edu!thisted
From: thisted@galton.uchicago.edu (Ronald A. Thisted)
Newsgroups: comp.sys.mac.system
Subject: Re: SCSI problems
Summary: Me, too, on a IIci
Message-ID: <1990Aug22.144829.10562@midway.uchicago.edu>
Date: 22 Aug 90 14:48:29 GMT
References: <47848@brunix.UUCP>
Sender: thisted@galton.uchicago.edu
Organization: Dept of Statistics, Univ of Chicago
Lines: 31

In article <47848@brunix.UUCP> man@cs.brown.edu (Mark H. Nodine) writes:
>Ever since I upgraded my Mac 512Ke+2Meg memory to System 6.0.5 (I'm
>using the XPRAM init, so that's not the problem), I've been having
>problems with occasional system hangs.  I've traced the problem in
>MacsBug to the code in the SCSI manager that implements the opcode
>scInc (I don't know anything about SCSI).  
>
> [Description of code omitted]
>
>Any idea what could be the cause of this hang?  Do I have a faulty
>SCSI port?  Or is there some incompatibility with System 6.0.5?
>

I have had a similar problem with a newly purchased IIci (running
6.0.5, of course).  The IIci has an internal hard disk.  I hooked up
my old Jasmine DD100 to the SCSI port.  Whenever the Jasmine is turned
on, the IIci fails to boot (chimes, sad mac, x0F x01).  When the
Jasmine is off, booting is fine.  After initial booting, the DD100 can
be powered up, and sometimes can be mounted successfully.  Sometimes,
the machine hangs after the DD100 icon shows up on the desktop.

Any clues would be appreciated.

Ronald Thisted
University of Chicago



Ron Thisted
Department of Statistics/The University of Chicago
thisted@galton.uchicago.edu