Int 49 Fn 17  - Ti Professional Pc - Crt - Get Start-of-display Pointer    [V]

   AH = 17h

Return: DX = current offset at which display starts

Note:  AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs

See Also: AH=01h,AH=02h,INT 10/AH=FEh