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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