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