1 Supported Cards, RAMDACs, and Bits Per Pixel

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The Mach64 X server supports 8bpp with a dot clock up to 80MHz on all Mach64 based cards. On certain cards, higher dot clocks and additional depths are available (see the table below). What determines this support is the RAMDAC on your card.

 RAMDAC      Max Dot Clock   BPP   Max Resolution   Video RAM Required
--------     -------------   ---   --------------   ------------------
ATI68860         135MHz       8      1280x1024             2Mb
ATI68860         135MHz      16      1280x1024             4Mb 
ATI68860          80MHz      32       1024x768             4Mb

ATI68880         135MHz       8      1280x1024             2Mb
ATI68880         135MHz      16      1280x1024             4Mb
ATI68880          80MHz      32       1024x768             4Mb

ATI68875          80MHz      32       1024x768             4Mb

CH8398           135MHz       8      1280x1024             2Mb
CH8398            80MHz      16       1024x768             2Mb
CH8398            40MHz      32        800x600             2Mb

STG1702          135MHz       8      1280x1024             2Mb
STG1702           80MHz      16       1024x768             2Mb
STG1702           50MHz      32        800x600             2Mb

STG1703          135MHz       8      1280x1024             2Mb
STG1703           80MHz      16       1024x768             2Mb
STG1703           50MHz      32        800x600             2Mb
    
All Others[*]     80MHz       8      1280x1024             2Mb
[*] - The dot clocks are limited to 80MHz and the bpp is limited to 8.

The RAMDAC is reported when you run the Mach64 X server with the "-probeonly" command line option.

The ATI68860 and ATI68880 RAMDACs are usually found on ATI Graphics Pro Turbo and ATI WinTurbo cards. The other RAMDACs are usually found on ATI Graphics Xpression cards.

As advertised, Mach64 graphics cards can use a special 24bpp mode (packed pixel mode), but this is not currently supported in the Mach64 for various reasons. The main one is that there is no current support for 24bpp modes in the X Consortium's servers. Adding this support will require a great programming effort.

The Mach64 X server requires the video memory aperture to function properly. This means that ISA Mach64 cards in systems with more than 12Mb of main memory will not work.

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