Syscall index: 0x1BBC
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.