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From: dmt@mtgzz.UUCP (d.m.tutelman)
Newsgroups: net.micro.pc
Subject: Re: Parity Check 1  message
Message-ID: <938@mtgzz.UUCP>
Date: Wed, 17-Jul-85 11:59:13 EDT
Article-I.D.: mtgzz.938
Posted: Wed Jul 17 11:59:13 1985
Date-Received: Thu, 18-Jul-85 08:22:20 EDT
References: <205@geowhiz.UUCP> <185@teneron.UUCP> <2026@ut-ngp.UTEXAS>
Organization: AT&T Information Systems Labs, Middletown NJ
Lines: 20
Cc: dmt

> I was playing around with the timer chip,
> trying to discover how to program it to drive the speaker, working from
> the Technical Refference Manual.
> .....  In addition to the many varied error messages and lockups
> I got as a result, one time the "PARITY ERROR 1" message appeared on
> the screen, and the soft reboot didn't work.
> 
> I would have thought that the timer chip wasn't so essential to the
> opperation of the pc.  I though the 8088 used it's own internal clock.

I believe that one of the channels on the timer chip is used to
generate the refresh signal for the dynamic RAM. If that got stretched
out significantly (or turned off altogether) it would guarantee
some sort of memory fault. Maybe that's what happened.

			Dave Tutelman
			Physical - AT&T Information Systems
				   Holmdel, NJ 07733
			Logical  - ...ihnp4!mtuxo!mtgzz!dmt
			Audible  - (201)-834-2895