Turn on 8Bit BT485 RamDac (Multia and 8-plane TGA only).
Turn on 6Bit BT485 RamDac (Multia and 8-plane TGA only).
If the server does not detect the base address of the 21030, then Check /proc/pci for the 21030 and look for the "Prefetchable 32 bit memory at 0x???????" and enter this as your MemBase setting. In XFree86 v3.3.2, if you are using Linux > v2.0.27 with the PCI routines the server should detect the base address automatically.