Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!hplabs!hpda!hpcuhc!pollux!dlow
From: dlow@pollux.HP.COM (Danny Low)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: SVGA questions
Message-ID: <5870020@pollux.HP.COM>
Date: 10 Jan 91 19:11:22 GMT
References: <10414@hydra.Helsinki.FI>
Organization: HP Lovecraft Division
Lines: 20

>(Linus Torvalds) 
>My guess so far has been a problem with my monitor - it's supposed to be
>able to display 1024x768, but it's INTERLACED. Is that a problem? If so
>is it "terminal", or can one tell the card to use interlaced mode?
>The weird thing is that I can see 640x480,16c (obviously as it's normal
>VGA), but I'm unable to get 640x480,256c to work even though this as I
>would understand it has the same frequency (flame me if I'm wrong).

My guess is your video card is defective. The defect is most likely
in the memory chips. 640x480,256c requires the second 256kb of memory
while 640x480,16c does not. All the problems you indicated involve
using the second 256KB of memory. As long as you are using a mode
that only requires 256KB of memory your card works okay. One quick
diagnostic you can do is look at the DRAM chips on the card and
see if any of them have a misaligned pin.

			   Danny Low
    "Question Authority and the Authorities will question You"
	   Valley of Hearts Delight, Silicon Valley
	     HP CPCD   dlow@pollux.svale.hp.com