Path: utzoo!utgpu!attcan!uunet!lll-winken!csd4.milw.wisc.edu!indri!ames!killer!jolnet!tarkus!jcs
From: jcs@tarkus.chi.il.us (John C. Sucilla)
Newsgroups: unix-pc.general
Subject: Re: Help on Combo Board Diagnostic
Summary: Bit 1 is stuck.
Message-ID: <427@tarkus.chi.il.us>
Date: 21 Apr 89 06:21:28 GMT
References: <1354@naucse.UUCP>
Reply-To: jcs@tarkus.chi.il.us (John C. Sucilla)
Organization: tarkus -- Calumet City, Il.
Lines: 16

In article <1354@naucse.UUCP> sbw@naucse.UUCP (Steve Wampler) writes:
>Memory Error: Connection to line X bad
>Wrote 55 to address Y, wrote FFFFFAA to address Z, read 57 from address Y
>
>Where X is (in repeating sequence) 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
>	17,18,21 (Should I at least be grateful it skipped lines 19 & 20?).
>And Y is (in sequence) 200000 200002 200004 200008 200010 200020 .... 240000

Looks like your combo boards memory is working except bit 1 (one)
is stuck active on the data bus.  Check for a bent backplane pin.
I'll bet you've got data bit one shorted to adress bits 19 and 20.

-- 
"We do what we can, but this little guy called Fate will do what he pleases
 anyway.  All we can do is give him enough to work with and hope it goes
 the way we want."  -  S.S.