PORTIBM PC Portable (uses same BIOS as XT) 8AE8-8AE9 - 8514/A and compatible - DESTINATION Y POSITION
Desc:	define the top row of the destination for a BLT, the axial step
	  constant for a line, or the ending row of a line segment in a
	  polyline; (Trio64) define the ending row of the first edge drawn
	  for a polygon or trapezoid
Notes:	supported by ATI Mach8 and Mach32 chipsets
	supported by S3 chipsets when PORTIBM PC Portable (uses same BIOS as XT) 03D4h register 40h bit 0 is set
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 82E8h,PORTIBM PC Portable (uses same BIOS as XT) 86E8h

8AE8w -W  drawing control: destination Y position / axial step constant
	  (see #P1034)
Note:	this port may be read on S3 chipsets


Bitfields for 8514/A destination Y position / axial step constant register:
Bit(s)	Description	(Table P1034)
 11-0	destination Y position
 13-0	axial step constant for line drawing
 15-14	reserved