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- From: andrick@sun.rhrk.uni-kl.de (Ulf Andrick [Biologie])
- Subject: [XFree86] Problems with tvga9000
- Message-ID: <1992Nov13.144752.21612@rhrk.uni-kl.de>
- Sender: news@rhrk.uni-kl.de
- Organization: University of Kaiserslautern, Germany
- X-Newsreader: Tin 1.1 PL4
- Date: Fri, 13 Nov 1992 14:47:52 GMT
- Lines: 54
-
- I have a Trident tvga9000 card with 512 k RAM and some noname 14"
- monitor with 35.5 kHz max. hor. scan freq..
- This hardware allows me to use 800x600 256-colour graphics
- under DOS. The monitors data sheet gave some timings,
- from which I calculted the dot clocks for Xconfig and I got
- exactly the VESA values as supplied by Th. Roell.
- In fact, the mono server ran with Xconfig.idiot without any
- modification. It also tolerated setting the chipset to
- tvga8900 and giving the clocks 25 28 45 36 as mentioned in
- README.trident. xclock.exe also reports these values.
- (What I want to use is 36 MHz.)
-
- The colour server refused to run with
- Xconfig.idiot. I changed chipset and clocks and commented the
- pseudo-800x600 modes out of Xconfig and then the server run,
- and the timings appeared to be correct, but only that one line
- output by the video card was spread over two lines on the
- screen. Apparently, the graphics card produces a clock
- frequency which is only half of that required.
- I also tried to comment chipset and/or clocks out and let the
- server "autodetect". But either the server exits without doing
- anything or it tries some clocks and exits then.
-
- I also used the tvgactrc-utility under DOS. It shows me that
- there is an optional 72 MHz clock available, and in fact, when
- I used it, it displayed the corrrect hor. scan freq. and
- produced a correct result, while 36 gave strange values. I
- don't understand that. Maybe, there is something wrong with
- the hardware. But the software seems to be wrong as well then.
- And then: why does the mono server work and the colour server
- not? Why does the card work under DOS? I wasn't able to
- produce a better output by shifting the 36 around in my clocks
- entry.
-
- Here is (from memory) what I use in Xconfig:
-
- vga256
- chipset "tvga8900"
- clocks 25 28 45 36 .....
- videoram 512
- modes "800x600" "640x480"
-
- viewport 0 0
-
- nd the VESA dot clocks for 800x600 36 MHz.
-
- Any help? Any other experiences with the mentioned graphics
- adaptor? Is tvga9000 not compatible to tvga8900C?
-
- --
- Ulf R. Andrick andrick@rhrk.uni-kl.de
- FB Biologie - Tierphysiologie
- Universitaet Was du nicht selber weiszt,
- D-W 6750 Kaiserslautern das muszt du dir erklaeren (Tegtmeier)
-