2 Supported RAMDACs

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If no RAMDAC is specified, a standard RAMDAC supporting 256 colors up to 80 MHz dot clock frequency is assumed. The following RAMDAC types can be specified in the Device section of the XF86Config file (e.g. Ramdac "att20c490"):

att20c490

Industry-standard 8-bit RAMDAC. The RAMDAC used on the basic Hercules Stingray Pro is compatible. 16bpp color depth is supported up to 40 or 55 MHz, depending on the DAC speed rating. This is the only RAMDAC that has been tested with the current driver.

att20c498

Industry-standard 16-bit RAMDAC. The RAMDAC used on the Hercules Stingray Pro/V and the Stingray 64/V is compatible. 16bpp is supported up to 80 MHz dot clock frequency.

zoomdac

This is the actual DAC used by the Hercules Stingray Pro/V and 64/V. It is treated mostly as an ATT20C498, but with dot clock limits set correctly (16bpp up to 55 MHz with ARK1000PV, up to at least 110 MHz with ARK2000PV).

stg1700

Completely untested.

The Dacspeed keyword can be used to indicate the speed rating of the RAMDAC, but it must be used with care.

To run XF86_SVGA at 16 bpp, pass options to the X server as follows:

startx -- -bpp 16               5-6-5 RGB ('64K color', XGA)
startx -- -bpp 16 -weight 555   5-5-5 RGB ('Hicolor')

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