Article View: comp.sys.atari.st
Article #29343Re: Ground on DTACK?
From: ftw
Date: Tue, 24 Nov 1987 14:32
Date: Tue, 24 Nov 1987 14:32
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1310 bytes
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
VOICE: 617-535-6644; FAX: (617) 535-5643; TWX: (710) 347-0125
INTERNET: ftw@datacube.COM
UUCP: {rutgers, ihnp4, mirror}!datacube!ftw
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!cmcl2!husc6!cca!mirror!datacube!ftw 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