Rev 1.1d
        Recompile with Micro-C Version 3.0

Rev 1.1c
        Unknown change...

Rev 1.1b
        Change 8255 initialization: Port C (2) is output

Rev 1.1a
        Add QA command
        Remove trailing * from CLK output (indicated chip was busy)
        Disable interrupts before RESET
        Fix 100 us delay loop
        Fix diagnostic reporting selection
        Expand serial input buffer to 250 bytes

Rev 1.0b
        Default to AO1/AI1/DP1 installed, remove CONFIG command

Rev 1.0a
        Add net mode 3 with command acknowledgement
        Force RESET to wait for serial output completion

Rev 0.2a
        Collect common code, add checksums

Rev 0.1d
        Relocate RAM to A000, remove sampling commands

Rev 0.1c
        Recompile to get all code in step

Rev 0.1b
        Revise channel and bit addressing nomenclature

Rev 0.1a
        Original version