Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewsj!rcd
From: rcd@cbnewsj.att.com (rana.c.dutt)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Video sync disappearing with new HD?
Message-ID: <1991Mar27.192055.10891@cbnewsj.att.com>
Date: 27 Mar 91 19:20:55 GMT
References: <043439.10019@timbuk.cray.com>
Organization: AT&T Bell Laboratories
Lines: 19

In article <043439.10019@timbuk.cray.com>, marc@sequoia.cray.com (Marc Bouron) writes:
> I've just taken delivery of a 106Mb drive from Third Coast Technologies.  It's
> a Toshiba mechanism (apparently) and came with all the usual ICD software.
> Well, the drive is just fine :-)  I've got ACRES of space to play with :-)
> B*U*T, it would appear that very occasionally the video is losing sync (i.e.
> the picture goes apeshit and completely unreadable) :-(
> 

This is the same problem I wrote about earlier in this newsgroup.

It's a known ICD host adaptor problem. Certain DMA accesses or
electrical noise to the ICD HD will screw up the video refresh
logic, resulting in screen image corruption.

The solution is to solder a 22 pF capacitor to pins 12 and 13 of
the DMA IN connector on the host adaptor board.

Rana Dutt
rcd@mtqua.att.com