H,? - DISPLAY THIS HELP
V   - DISPLAY VERSION
D   - DUMP INTERNAL MEMORY 00-7F
DU  - DUMP INTERNAL MEMORY 00-FF
DC..- DUMP CODE MEMORY PAGE: DC<ADDR> (OMIT TO CONTINUE) 
T   - RUN USER TEST COMMAND
I   - USER INFO
W.. - PORT WRITE: W<PORT><BYTE>
R.. - PORT READ:  R<PORT>
      PORT: 1 OR 3, BITS RXD,TXD AND WR ARE MASKED
M.. - MODIFY CODE MEMORY: M<ADDR> (OMIT TO CONTINUE) 
      ENTER BYTE TO WRITE
      ENTER NOTHING TO SKIP
      ENTER DOT (".") TO FINISH
      PRESS TAB TO ABORT
G.. - EXECUTE CODE FROM DESIRED ADDRESS IN CODE MEMORY
      G<ADDR> (OMIT TO REPEAT) 
       
  