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From: robin@medstar.UUCP (Robin Cutshaw)
Newsgroups: net.micro.pc,net.unix-wizards
Subject: Re: Xenix 286 & Graphics
Message-ID: <176@medstar.UUCP>
Date: Fri, 7-Jun-85 14:34:56 EDT
Article-I.D.: medstar.176
Posted: Fri Jun  7 14:34:56 1985
Date-Received: Sun, 9-Jun-85 02:30:09 EDT
References: <263@tellab3.UUCP>
Organization: Medical Systems Technology and Research, Inc., Atlanta, Ga.
Lines: 27
Xref: watmath net.micro.pc:4183 net.unix-wizards:13454

To eliminate the reinitialization of the EGA in Xenix you must patch the
routine that does this...

cp /xenix /xenix-
adb -w /xenix -
$x
initCRTC+4?w cbc9		/* c756 = cbc9 */
$q


This will avoid initCRTC by just returning.

To use the color graphics adapter in graphics mode you will have to talk to
the controller.  I have written (and extensively use) an I/O channel device
driver that will allow me to examine/modify any I/O address including the
graphics adapter and the PC Network Adapter.  I may post this to net.sources
shortly.  To actually write into graphics memory you will have to use some
of the defined macros in sys/param.h to get between kernel and physical memory.
This is what I use to DMA into/from the PC Network Adapter.

Good luck...


-- 
----
Robin Cutshaw
uucp:   ...!{akgua,gatech}!medstar!robin