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From: paulc@boulder.colorado.edu (Paul Connally)
Newsgroups: comp.sys.sgi
Subject: Reading/Writing VME bus
Message-ID: <1991Feb14.171321.11620@csn.org>
Date: 14 Feb 91 17:13:21 GMT
Sender: news@csn.org (news)
Reply-To: paulc@boulder.colorado.edu (Paul Connally)
Organization: University of Colorado, Boulder
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Nntp-Posting-Host: beagle.colorado.edu



	We currently have a PI (4D20) with Imaging Technologies IT-150
video processsing boards connected to the VME bus.  I use some third
party software to access these boards but it is not enough.
 
	My question is this -
	How does one go about writing to the VME bus (in a C program)
to access the registers on these boards? 

	 I have all the docs for the boards and I know what addresses 
they occupy but I'm really not sure how to get to them and I don't 
want to go mucking about the bus without knowing exactly what I'm doing.

	Also, do I have to deal with interrupts?  The boards can be
configured to issue interrupts or not, the interrupt line (1-7), and the
interrupt vector address.

	Any hints, advice, or constructive comments is greatly appreciated.

	Paul Connally          			University of Colorado
	Chief of Operations  			MCDB  -  Box 347
	High Voltage Electron Microscope Lab	Boulder, CO  80309
						paulc@boulder.colorado.edu

	
	Paul Connally          			University of Colorado
	Chief of Operations  			MCDB  -  Box 347
	High Voltage Electron Microscope Lab	Boulder, CO  80309
						paulc@boulder.colorado.edu