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From: ftw@datacube.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: Ground on DTACK?
Message-ID: <105100033@datacube>
Date: Tue, 24-Nov-87 09:32:00 EST
Article-I.D.: datacube.105100033
Posted: Tue Nov 24 09:32:00 1987
Date-Received: Sat, 28-Nov-87 15:41:06 EST
References: <361@usl-pc.UUCP>
Lines: 19
Nf-ID: #R:usl-pc.UUCP:-36100:datacube:105100033:000:731
Nf-From: datacube.UUCP!ftw    Nov 24 09:32:00 1987


Don't ground DTACK.  If your ST works at all after doing that, it will in
all likelyhood crash and burn VERY quickly.

DTACK is a signal to the 68K that tells it that data is ready to be read
or has finished writing.  DTACK is an acronym for Data Transfer ACKnowledge.
Grounding it would have the effect of asserting DTACK continuously, faking
the 68K into always beleiving that it can read its data lines, or that
a write has finished (and the data lines can now change state safely).

Don't do it.


				Farrell T. Woods 

Datacube Inc. Systems / Software Group	4 Dearborn Rd. Peabody, Ma 01960
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