MEM A000h:82E8h - S3 - MEMORY-MAPPED CURRENT Y POSITION REGISTER                
Size:	WORD
Note:	the S3 graphics processor registers can be mapped at either
	  linear 000A0000h or at offset 16M from the start of the linear
	  frame buffer
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 82E8h