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From: tom@wcc.oz.au (Tom Evans)
Newsgroups: comp.protocols.appletalk
Subject: Re: Problem with Webster Multigate
Keywords: webster multigate lights exception fault
Message-ID: <1653@wcc.oz.au>
Date: 18 Mar 91 00:37:02 GMT
References: <9135@castle.ed.ac.uk>
Organization: Webster Computer Corp, Melbourne, Australia
Lines: 35

In article <9135@castle.ed.ac.uk>, ercm20@castle.ed.ac.uk (Sam Wilson) writes:
> I've just been configuring my second Multigate.  The first one came up
> with no problems.  The second is temperamental.  
>
>    ... The one occasion I happen to
>    have had MGTalk running when this happens I saw a repeated error
>    message saying:
> 
>    "Exception 2 at PC = 0x6F14 to ipl=7 from ipl=7
>     Supervisor data word read access of addr 0x178C3A. ssw=1105"

0x178C3A is a legitimate address up near the top of the 1/2Mb of DRAM.
Exception 2 is a 68K Bus Error. This is likely to be a Memory Parity
Error. It may also be that the MultiPort Gateway was damaged in
transit on the way to Scotland, and that is causing it.

MGTalk (Application that runs on a Mac connected to the MPG's Console
port) is just a terminal emulator. Leave it running - connected to the
MPG and see what other error reports (if any) you get.

I've sent more details (on debugging and theory of operation) by 
separate mail to Sam Wilson.

========================
Tom Evans  tom@wcc.oz.au
Webster Computer Corp P/L, 1270 Ferntree Gully Rd Scoresby, Melbourne 3179
Victoria, Australia 61-3-764-1100  FAX ...764-1179  A.C.N. 004 818 455

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