h6. [[OS SWI Calls]] h6(. » [[OS_SerialOp]] h6((. » OS_SerialOp 3 h2. OS_SerialOp 3 h5. (SWI &57) |_<^{width:4em}. Entry | | |<^. R0 |<^. 3 | |<^. R1 |<^. Character to be sent | |_<^{width:4em}. Exit | | |<^. R0 |<^. Preserved| |<^. R1 |<^. Preserved | |\2<^. C flag clear if character was sent, or set if character was not sent (ie the buffer was full)| h4. Use The purpose of this call is to send a byte into the serial output buffer. h4. Notes 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. h4. See also * [[OS_SerialOp]]