=> R0 = 4 (reason code)
<= R0 preseved
R1 = character received (if C flag cleared), or preserved (if C flag set - ie no character available in buffer to read)
This call removes a character from the serial input buffer if one is present. If removing a character leaves the input buffer with more free space than are specified by OS_Byte 203, then the transmitting device is re-enabled in the way specified by the serial port state (as set by OS_SerialOp 0).
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