Click above to get retro games delivered to your door ever month!

Function 4407h          Check Device Output Status

    Checks to see if the device or file is ready for output.

        Entry   AX = 4407h
                BX = Device or file handle

        Return  AL = FFh   Ready
                AL = 00h   Device not ready
                or
                AX = Error code, if CF is set
                     | 01h Invalid function
                     | 05h Access denied
                     | 06h Invalid handle

    Note
    For an output file, this function always returns AL = FFh (ready),
    even if the disk is full or there is no disk in the drive.

    
    Example

        mov     bx,StdPrn
        mov     ax,4407h
        int     21h
        jc      @@error
        cmp     al,0ffh
        jnz     @@PRN_not_ready
        ;...