Rev 1.2d
        Recompile with Micro-C Version 3.0

Rev 1.2c
        Add support for 50 Hz line frequency (separate EPROM)
                50 Hz file = PLLINK50.HEX

Rev 1.2b
        Debugging output commands
        Expand serial input buffer to 250 bytes

Rev 1.2a
        Add net mode 3 with command acknowledgement
        Force RESET to wait for serial output completion

Rev 1.1d
        Deselect all other housecodes for each House/Dev msg

Rev 1.1c
        Add M command to disable remote control inputs

Rev 1.1b
        Collect common code
        Disable serial interrupt trace output

Rev 1.1a
        Add checksums to network mode

Rev 1.0b
        Relocate 8K RAM to A000

Rev 1.0a
        General release versions
                split SmartX10 and PLLink code
        Fix Q h command
                omitted device number is now equivalent to 00
        Recompile to get all code in step