PORTIBM PC Portable (uses same BIOS as XT) 92E8-92E9 - 8514/A and compatible - BRESENHAM ERROR TERM
Desc:	specify the initial error term for drawing a line using the Bresenham
	  algorithm
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
	the error term is 2*min(|dx|,|dy|) - max(|dx|,|dy|) - 1 [startX < endX]
	or 2*min(|dx|,|dy|) - max(|dx|,|dy|) [startX >= endX]
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 92EAh

92E8w -W  drawing control: Bresenham error term (bits 13-0)