doug@cornell.UUCP (Douglas Campbell) (07/10/85)
Just a few days ago, I used another department's AT under Xenix, and found
that /dev/mem went to C6000 and beyond! This means that graphics are no
longer such a problem under Xenix. They got their version about a month
ago, so I wonder - does anyone know which versions of Xenix have this feature
and which don't? In fact, *any* info on the various versions of AT Xenix
floating around would be appreciated.
Doug Campbell
doug@cornell.{UUCP|ARPA}bb@wjh12.UUCP (byer) (07/12/85)
> Just a few days ago, I used another department's AT under Xenix, and found > that /dev/mem went to C6000 and beyond! This means that graphics are no > longer such a problem under Xenix. > Doug Campbell > doug@cornell.{UUCP|ARPA} If you expect to open("/dev/mem",2) and write to it in order to do pixel-level graphics, I think I'll wait and read the book. The overhead of the system calls and the cpass() & passc() guys will grow cobwebs on your phosphor. I think you gotta put on your hip-boots and hack out a way to map the correct part of kernel adr. space into YOUR adr. space. Now you can cook. Before you actually do this, try to contact Robin Cutshaw (robin@medstar); I think he's doing it. Brent Byer (harvard!wjh12!bb)
vlv@drux3.UUCP (Vaughn Vernon) (07/16/85)
I must agree with the rest of the gang. All those system calls, especially on a multiuser system would be sooooo slow! I know that GSS has there VDI graphics with a meta file system and 'C' bindings on the 7300. I saw it and I was impressed (which may not mean much). They even had two dimensional object rotation (cosmic! like what a totally awesome concept!). I really am not sure whether this is available on Xenix but from a brochure that I read it seems they said something about it. Maybe if they got enough pressure it would become available. Besides, their priorities seem to be in pleasing IBM at this time. You are talking Xenix/286 aren't you? Vaughn Vernon AT&T ISL Denver, CO ihnp4!drutx!drux1!vlv I speak for no one but Baker and Ed. (Real Coors Gurus). (Seen: it's snowing in the Rockies. What else.) Ed: "Baker." Baker: "Ya Ed." Ed: "How many six packs do you think are falling out there right now?" Baker: "Gee, I never thought of it that way! There must be millions, thousands even!!!"