PORTIBM PC Portable (uses same BIOS as XT) E2E8-E2E9 - 8514/A and compatible - PIXEL DATA TRANSFER
Desc:	all graphics data to be processed by the Graphics Engine is sent
	  through this port
Notes:	supported by ATI Graphics Ultra
	supported by S3 chipsets when PORTIBM PC Portable (uses same BIOS as XT) 03D4h register 40h bit 0 is set

E2E8w -W  drawing control: pixel data transfer
E2EAw rW  drawing control: pixel data transfer (S3 801+) for 32-bit transfers