=> R0 = 204 (&CC)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = flag before being overwritten
R2 corrupted
This call enables or disables serial input buffering. 0 will enable buffering of received data. Any other value will prevent buffering, but errors will still generate events if enabled with OS_Byte 14.
See PRM 2, page 455
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