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Syscall index: 0x1BBC (not yet included in libfxcg!)
Function signature: int Serial_WriteSingle(unsigned char x)
Sends a single byte through the 3-pin serial port, by putting it in the transmit buffer.
- x - byte to transmit.
- 0 if successful,
- 2 if no space is available in the serial transmit buffer (which has a size of 256 bytes),
- 3 if the serial channel is not open.