VDU 8    : REM Move one position to the left
      VDU 9    : REM Move one position to the right
      VDU 11   : REM Move up one line
      VDU 10   : REM Move down one line
      VDU 13   : REM Move to the beginning of the line
      VDU 30   : REM Move to the top left corner
      VDU 23,16,16;0;0;0; : REM Disable scrolling
      VDU 13,8,10 : REM Move to the end of the line
      VDU 30,8 : REM Move to the bottom right corner
      VDU 23,16,0;0;0;0; : REM Enable scrolling