=> R1 = DevicesFS stream handle
<= R0 = byte to transmit
C set if unable to read a character to transmit
This SWI is made by a device when it wants to transmit a character. DeviceFS will try to find character (unbuffer one, or read from a waiting stream).
Note:For speed DeviceFS_TransmitCharacter and DeviceFS_ReceivedCharacter do not validate the external handle passed - strange things will happen if bad handles are passed.
See PRM 2, page 437.
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