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From: mzaik@apple.cis.ohio-state.edu (Tahsin Mzaik)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Need AT BUS Timing Diagrams for DMA
Keywords: AT BUS, ISA, DMA, 386SX
Message-ID: <86992@tut.cis.ohio-state.edu>
Date: 2 Jan 91 15:54:31 GMT
Sender: news@tut.cis.ohio-state.edu
Reply-To: <kamarshi@osu.edu>
Organization: Ohio State University Computer and Information Science
Lines: 11

I am in the process of designing a DSP based Data Acquisition and
processing system to port to the AT Bus.  But I find myself stymied
by the lack of DMA handshake signalling protocol info.  I have searched
long and hard, but the best I could come up with was the IBM PC hardware
manual.  The manual just has a brief description of the ISA Bus signal
functions with a lot of questions unanswered (the norm for IBM manuals?).
Can somebody give me any info about where to look for things like DMA
cycle timing diagrams etc.?  I would imagine there are a lot of people
out there in netland designing pc peripherals.  I would appreciate any
inputs from them.
Thanx