=> R0 = 192 (&C0)
R1 = 0
R2 = 255
<= R0 = preserved
R1 = communications state
R2 = flash counter (see OS_Byte 193)
This call reads the serial port state - equivalent to a read operation with OS_Byte 156. It is provided for backwards compatibility - use OS_SerialOp 0 and 1 instead. This call should not be used to write the value - doing so would make the value in memory inconsistent with the hardware.
See PRM 2, page 452
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