Int 15/AX=2303h

AX = 2303h
BX = ??? ('x')
DX = 'y' and 'z'
bits 15-7 = 'y'
bits 6-3 unused
bits 2-0 = 'z'
DI = ??? (0352h)

Return:
???

Notes: Performs graphics functions, writes to segment A000h and VGA I/O ports. IBM classifies this function as optional

Category: Bios - Int 15h - I