=> R0 = 203 (&CB)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = value before being overwritten
R2 = serial ignore flag (see OS_Byte 204)
This call reads or sets the serial buffer threshold. While the free space is below this value the serial harware will attempt to halt incoming data. OS_SerialOp 0 controls the handshaking method. The default threshold is 9 characters.
See PRM 2-453
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