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Article #1815

Re: CTPCI and speeding up video

#1815
From: Kitt Tientanopajai
Date: Wed, 07 Jun 1995 00:00
43 lines
2844 bytes
> 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>
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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
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