Robert_Bell@mindlink.UUCP (Robert Bell) (02/23/91)
Hi Brian, I use a vga moniter with a trident 8800 board with 512k memory so by rights I should be able to do 640 * 480/256 but I am unable.After a lot of phone calls to tech lines I managed to find that the vga moniter uses a horizontal frequency of 31.4 khz and inorder to display 256 colours at 640 * 480 resolution you need a horizontal frequency of approximately 29 khz. so if you use a driver for 256 colours the moniter is unable to sync to the horizontal frequency and you get a totally unreadable screen,hope that helps you and if anyone else knows otherwise, then please let us know as i would certainly like to be able to use 256 colour mode. -- ------------------------------------------------------------------- Robert Bell uunet!van_bc!rsoft!mindlink!a1076 Benndorf-Verster a1076@mindlink.uucp Vancouver Canada voice 604-853-5870 -------------------------------------------------------------------
jdb@reef.cis.ufl.edu (Brian K. W. Hook) (02/24/91)
I have a Princeton PSC-28 VGA color monitor (fixed frequency). I also have a Paradise 16/Plus 256K card. Now, the card will go as high as 640x400x256 colors and the monitor can handle this mode just fine. Now, I can't afford to switch my monitor AND my card, so what I would like to do is upgrade my video card to something like an ET4000 1MB card. I know that I my monitor will not exceed 640x480, but will I be able to do 640x480x256 colors? Then LATER I can get a new monitor. Brian
dd2x+@andrew.cmu.edu (David Eugene Dwiggins) (02/25/91)
Actually, most "good" cards and monitors will support 256 colors at 640x480. The trident is the only card I've seen that won't do it. I've had no problems with my ZCM-1492 (fixed frequency) VGA and my STB PowerGraph VGA. David
Robert_Bell@mindlink.UUCP (Robert Bell) (02/26/91)
I've got the Trident 8800 chip set and 512k ram but still can't get 256 colours in 640 * 480 on a standard vga monitor.All I get is a lot of wavy lines and not much else ,explain that!wavy lines -- ------------------------------------------------------------------- Robert Bell uunet!van_bc!rsoft!mindlink!a1076 Benndorf-Verster a1076@mindlink.uucp Vancouver Canada voice 604-853-5870 -------------------------------------------------------------------
mir@opera.chorus.fr (Adam Mirowski) (02/27/91)
In article <EbmdDYy00Uh741g704@andrew.cmu.edu>, dd2x+@andrew.cmu.edu (David Eugene Dwiggins) writes:
%% No, No, No. You missed the post I was replying to. The owner had a fixed
%% freqency VGA monitor and was trying to use the 640x480x256 mode.
%% The trident is the only video card that I've seen that doesn't support this
%% mode on a standard VGA monitor. There's no question that it supports it
%% on a multisync.
Yes. The timings my Trident 8900 produces in 256 colors mode are different
from the 16 colors mode ones. My multisync needs to be adjusted to
display the image in the same place. In 256 color modes image tend to be lower.
Could someone explain the reason?
--
Adam Mirowski, mir@chorus.fr (FRANCE), tel. +33 (1) 30-64-82-00 or 74
Chorus systemes, 6, av.Gustave Eiffel, 78182 Saint-Quentin-en-Yvelines CEDEXmlord@bwdls58.bnr.ca (Mark Lord) (03/01/91)
In article <27113@uflorida.cis.ufl.EDU> jdb@reef.cis.ufl.edu (Brian K. W. Hook) writes: <I have a Princeton PSC-28 VGA color monitor (fixed frequency). I also <have a Paradise 16/Plus 256K card. Now, the card will go as high as <640x400x256 colors and the monitor can handle this mode just fine. Actually, your card can also do 800x600 in 16 colors. If your monitor can also handle this mode, then you should have no problem keeping the monitor and upgrading to an ET4000 (below). The number of colors is not important; the number of pixels is what counts. <Now, I can't afford to switch my monitor AND my card, so what I would <like to do is upgrade my video card to something like an ET4000 1MB <card. I know that I my monitor will not exceed 640x480, but will I <be able to do 640x480x256 colors? Then LATER I can get a new monitor. < <Brian -- ___Mark S. Lord__________________________________________ | ..uunet!bnrgate!mlord%bmerh724 | Climb Free Or Die (NH) | | MLORD@BNR.CA Ottawa, Ontario | Personal views only. | |________________________________|________________________|