Video: 24bpp/1280x1024 w/4MB RAM? (Diamond S64VVRAM)

Video: 24bpp/1280x1024 w/4MB RAM? (Diamond S64VVRAM)

Post by Matt Dill » Fri, 20 Jun 1997 04:00:00

:>I should know better than this, but I've just upgraded my Diamond
:>Stealth 64 Video VRAM (S64VV) to 4MB VRAM.  In the manual for S64VV,
:>it says that you can get 24 bit color at 1280x1024 with 4MB.  The
:>XF86_S3 server does not allow this, though.
:>4MB = 4194304 bytes...
:>3 bytes X 1280 X 1024 = 3932160  (Fits if pixels are packed)
:>4 bytes X 1280 X 1024 = 5242880  (Does not fit for aligned pixels)
:>I'm guessing that the XF86_S3 server uses nice, fast, aligned, 32-bit
:>words in the frame buffer for each pixel, and that Diamond's claim is
:>probably based on a slower windoze driver that actually packs the
:>pixels into 24 bits per pixel, at the cost of a performance hit for
:>misaligned memory access.
:>My question is, is there a way to make the XF86_S3 driver pack the
:>pixels, take the performance hit, and give me 1280x1024x24?  (Without,
:>that is, rewriting the S3 driver ;)
:>Any hints/tips are greatly appreciated.
:>John Marco

    XFree86 3.3 will do 24 and 32 bpp with the XF86_S3V driver.  However,
    the maximum dot clock at those resolutions drops rather precipitously.
    It depends what kind of card you have.  I have the stealth 3D 3001, with
    4MB of ram.

        At 8 bits, the maximum dot clock is 135 MHz - 1600x1280 can be done
        At 16 bits, the maximum dot clock is 95 MHz - 1280x1024 can be done

    I can run the screen at 53 KHz without seeing any flicker (except for
    very bright white windows).  I also have an 1152x900 mode that runs
    at 66 KHz.

    Considering how cheap the card was, this is a major deal.

    I had Xfree86 3.2 installed on my system, and just popped into and snarfed the 2.2 binary for 3.3's XF86_S3V server
    rather then recompile everything.  It works like a charm.



1. 24bpp @ 1280x1024 4MB Stealth 64VRAM (968), Xfree 3.2

Hello all,

I just installed Xfree 3.2 hopping that I will get 24 bpp from my
Diamond Stealth 64 Video VRAM (S3 968, IBM_RGB_52xx), having 4MB
of RAM, at 1280x1024.

Unfortunately, the most I get is 16bpp. When I try to run 24bpp,
the server complains about "insufficient memory".

Can someone help or explain?

Thanks in advance.
Theodore Kaskalis

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