Bitfields for OPTi 82C750 Vendetta (device 0) memory control:
Bit(s)	Description	)
 31-30	reserved
 29	reserved (1)
 28-18	reserved
 17	reserved (1)
 16	HA drive-back during CPU memory access enable
 15-6	PCI video frame buffer write posting hole
 5-4	reserved
 3	PCI bus write post disable
 2	video frame buffer write post (posting enabled if bit 2 = bit 3)
 1	video memory write post(posting enabled if bit 1 = bit 3)
 0	I/O cycle write post enable
SeeAlso: #00929,#00931