INT 2F - DOS 3.0+ internal - FIND UNREFERENCED DISK BUFFER AX = 1210h DS:DI -> first disk buffer to check Return: ZF clear if found DS:DI -> first unreferenced disk buffer ZF set if not found Note: in DOS 5+, this has become essentially a NOP, invoking the same code used by AX=1224h (SHARING DELAY) SeeAlso: AX=120Eh