Int 16 Fn D724 U - Apcal V3.20 - Get ??? [U] AX = D724h CX = 00CCh Return: AX = 0000h BX = 0000h DX:CX -> ??? (apparently an internal data area) See Also: AX=D724h/CX=00CBh,AX=D724h/CX=00CDh