=> R0 = byte received
R1 = DevicesFS stream handle
<= C clear if byte transferred
C set if not transferred
This SWI is made by a device when it receives a character. DeviceFS will then process the character (buffer it, or unblock a waiting stream).
Note:For speed DeviceFS_ReceivedCharacter and DeviceFS_TransmitCharacter do not validate the external handle passed - strange things will happen if bad handles are passed.
See PRM 2, page 436.
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