; Standard devices
        ; Handle          Name                 Default device
        STDIN   = 00h   ; Standard input       CON   keyboard
        STDOUT  = 01h   ; Standard output      CON    display
        STDERR  = 02h   ; Standard error       CON    display
        STDAUX  = 03h   ; Standard auxiliary   AUX   (serial)
        STDPRN  = 04h   ; Standard printer     PRN    printer

        ; DOS provides open handles to the standard devices
        ; when it starts a program.
        ; A program can redirect the standard devices, associating
        ; one or more of the handles with other character devices
        ; or with files.