Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!van-bc!rsoft!mindlink!a516 From: a516@mindlink.UUCP (Jordan Melville) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Computer slow since installation of SCSI drive Message-ID: <4085@mindlink.UUCP> Date: 9 Dec 90 01:25:06 GMT Organization: MIND LINK! - British Columbia, Canada Lines: 39 > > mussar@bcars53.uucp writes: > In article <1990Dec9.050509.1470@vax5.cit.cornell.edu> > hd7x@vax5.cit.cornell.edu (Sanjay Aiyagari) writes: > > > >This sounds strange, but one possibility (I'm not sure but it is possible) > is > >that the new hard disk controller is causing a conflict in the C000/D000 > areas > >of memory, causing the VGAWonder to use 8-bit ROM access, rather than 16. > If > >you are using video RAM shadowing, then this is not the problem; if you are > >not, then try using video RAM shadowing. This will copy the ROM into RAM > and > >will ensure it is being accessed 16 bits at a time. > >Sanjay Aiyagari (hd7x@vax5.cit.cornell.edu) > > You can't shadow the video RAM only the video ROM. (What good would it do for > you to be reading/writing the shadow RAM when the video controller was still > displaying the card's RAM?). But, the 8/16 bit access to video RAM can be > a problem. If the system detects ANY 8 bit card in the same 128K address > range > as the video card, all access to the video RAM will be 8 bit (we've measured > more than 2x decrease in performance). Is there a program/method that I can use to check if my card it using 8 or 16 bit addressing? All I can get the ATI software to tell me is that the power-on configuration is set for 16 bits. Also, how could the SCSI card set it down to 8 bits? It's a 16 bit card also. Jordan. -- ------------------------------------------------------------------------------ Jordan C. Melville Voice: (604) 943-7155 Vancouver, BC BBS: (604) 943-3503 (2400baud) "We want the world and UUCP: {uunet,ubc-cs}!van-bc!rsoft!mindlink!a516 we want it now!" - The Doors a516@mindlink.UUCP "So what you're saying is a 11 voice adlib is better than a 32-track MT-32? Sounds logical to me." - Me.