Article View: alt.games.descent
Article #1815Re: CTPCI and speeding up video
From: Kitt Tientanopajai
Date: Wed, 07 Jun 1995 00:00
Date: Wed, 07 Jun 1995 00:00
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> Someone on alt.games.descent mentioned a pgm called CTPCI, which > allows you to control several PCI/Neptune/Mercury chipset parameters, > from a DOS command line. It helped me boost my memory subsystem > performance a bit, but mainly it helped improve my DOS/Windows > video performance a great deal. By turning off CPU to PCI Bursting, > using CTPCI's -B option, I was able to get the ATI Gfx Pro Turbo card to > run MUCH faster in any video mode that uses the "old style" SVGA/VGA modes, > which run out of the < 1M address space (all DOS games currently out there > use the older "banked" modes, and the VGA 320x200 etc modes all > run out of this space). > > The strange thing is, that apps which use the card in native mode, > using the linear aperature modes in the PCI address space (real high up > there, like at the 4016MB range I think), turning off PCI BURST makes > things much slower. The OS/2 video driver for the ATI Mach 64 uses > the card in it "native" mode, so the -B option slows things up > for OS/2. When using the VESA 2.0 test pgm VBETest, the linear > aperature VESA 2.0 modes slow down by more than 50% when you > turn off CPU to PCI Bursting. So theoretically games that > come out using the advanced VESA 2.0 linear gfx modes, will > be a lot faster if you use the +B (turn on CPU to PCI BURST) > with the ATI Mach 64 card. For now under DOS/WIN -B is best. > > Windows 3.11 and the ATI Mach 64 drivers actually SPEED UP by quite > a bit when you turn off CPU to PCI BURST..so it looks like the Windows > 3.11 stuff DOES NOT use the ATI card in its fastest (linear aperature) > mode...seems like it should. > > Oh well, for now I am happy, my DOS video games are A LOT faster, > Windows is a bit faster, 3DBench went from 71 fps to over 88 fps.. > and I can still keep PCI BURST on for OS/2 so it does not lose anything. > > Cards like the Hercules w32p's, the Hercules ARK2000's and the s3 864/964 > based cards seem to work fine in all modes when the BURST is on..it is > only the ATI card that seems to love BURST for the linear aperature > modes, and hate it for "normal/oldstyle" modes. > > -Roger > -------------------------------------------------------------- > NET: uz...@crash.cts.com > *WINDOWS from the folks who brought you EDLIN Umm...How can I find it ?...Where can I FTP it ?
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From: Kitt Tientanopajai <ki...@gear.kku.ac.th.> Subject: Re: CTPCI and speeding up video Date: 1995/06/07 Message-ID: <3r358n$bk@malakor.kku.ac.th> X-Deja-AN: 103902471 references: <D9KMp0.G2J@crash.cts.com> organization: Khon Kaen University, Khon Kaen, Thailand newsgroups: comp.os.os2.advocacy,alt.games.descent,comp.sys.ibm.pc.games.action,comp.benchmarks MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit