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- From: bruno@athena.mcrcim.mcgill.edu (Bruno Hall)
- Newsgroups: comp.unix.sys5.r4
- Subject: Re: Dell issue 2.2 video
- Message-ID: <1992Nov7.015255.2242@thunder.mcrcim.mcgill.edu>
- Date: 7 Nov 92 01:52:55 GMT
- References: <1311@kepler1.rentec.com> <1992Nov5.071707.17297@thunder.mcrcim.mcgill.edu> <1992Nov06.035606.0617081@locus.com>
- Sender: news@thunder.mcrcim.mcgill.edu
- Organization: McGill University Broom Closet
- Lines: 78
- Nntp-Posting-Host: athena.mcrcim.mcgill.edu
-
- peet@locus.com (J. David Peet) writes:
- > I (Bruno Hall) wrote:
- >>
- >>I just got myself an ATI Graphics Ultra, and am mostly pleased with
- >>it. Under Dell 2.2, running Xmach at 1024x768x256, on a (very non-Dell :-)
- >>486-33, I'm getting 68,000 Xstones. It's *great*.
- >>
- >>BUT I can't seem to make a native VGA DOS image under Merge. The
- >>screen just blanks out, and the thing sits there. What this means is
- >>that I can't access any of the non-standard VGA modes under DOS. Same
- >>story on another machine (different hadrware brand).
- >>
- >>Has anyone managed to do this with a Graphics Ultra?
- >>
- >>Naturally, neither Dell nor Locus answer my mail on this topic, which
- >>seems strange, particulary since this card is actually supported
- >>by Dell, and is a name-brand item to boot.
- >
- >Please, I did answer your mail! My e-mail answer got damaged, and earlier
- >today I got e-mail from you in which you stated that you had received
- >a screwed up e-mail answer from me. I was fully intending to try again
- >tonight after I finished my regular tasks. Please give us a little time to
- >reply before flaming. (What if I was on vacation or sick, or was somehow
- >prevented from using e-mail?
-
- Yes, I hadn't thought of that, but then I had also seen posts from you
- to the net both before and after I had sent you mail (and received a
- munged response ;-).
-
- >A few weeks ago our e-mail and net-news
- >connection machine completely died (probably taking a few messages down with
- >it), and took a day or so to replace it and get e-mail working again, and
- >more than a few days to get news flowing again.)
-
- OK OK, I agree -- I over-reacted. Mea culpa.
-
- >My reply is this: Making "native" VGA DOS images only works for a few
- >VGA cards. This is a known restriction. In the future, it is intended
- >that more cards will be made to work, most likely involving special
- >code for each new card.
-
- Sounds like a Good Thing.
-
- >Making "native" (a.k.a. on-card-ROM) images is an inherently dangerous
- >thing to do (e.g. it can lock up the machine), but if it the image file
- >get made, then it is safe to use. Making "standard" VGA images is
- >inherently SAFE, so that is the default one that is made and used.
-
- It's strange. I use a 'mkimg native vga d .', and the system gets the
- copy of the ROM just fine, but it craps out (informs me that it's
- making the VGA image, doesn't seek A:, changes video modes, blanks the
- screen, and then stops) when trying to make the DOS image (none is
- created). It doesn't take the system down, however; after switching to a vt
- and back, I can kill it.
-
- It's really a pity; the Graphics Ultra is really an excellent card for X.
-
- >The reason it is dangerous is not due to a "bug", but due to the fact that
- >for the boot code in most VGA ROMs to work, we must give it more control
- >over the real machine than is normally done. Thus if the boot time code
- >has problems because it is trying to do something that just cannot be
- >supported with the current version of Merge, it can hang the machine.
- >In several cases I know, VGA ROM boot code plays with the system timer,
- >which also controls the RAM refresh. Having the RAM refresh turned off
- >is a very fast way to hang your machine.
-
- So I guess I'm also in the market for SVR4.3 and the new-and-improved
- Merge. :-)
-
- I just hope that Dell doesn't go Solaris before releasing a 4.3...
-
- Bruno
- --
- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
- Bruno Hall | VE2HUM | bruno@mcrcim.mcgill.edu
- McGill Research Centre for Intelligent Machines - Controls Group
- New systems generate new problems -- Join the Flat Earth Society.
-