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