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=>     R0 =     reason code :
                 0     Initialise
                 1     Finalise
                 2     Wake up for TX
                 3     Wake up for RX
                 4     Sleep RX
                 5     Enumerate directory
                 6     Create buffer for TX
                 7     Create buffer for RX
                 8     Halt
                 9     Resume
                 10     End of data
                 11     Stream created
                 12     Monitor TX
                 13     Monitor RX
                 14     IOCtl

     R8 =     private word
     R12 =     workspace pointer
     other registers as given in calls
<=     R0 preserved, or V set and R0 pointing to an error block
     R1 preserved
     All named registers preserved

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