=> R0 = 3 (reason code)
R1 = character to be sent
<= R0,R1 preserved
C clear if character was sent, or set if character was not sent (ie the buffer was full)
This call puts a character in the serial output buffer, and re-enables the transmit interrupt if it had been disabled by RISC OS. If the serial output buffer is full, the call returns immediately with the C flag set.
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