text: Revision as of 19:03, 17 November 2012
  
  The VES has four usable 8-bit data ports in the console, port 0 and 1 that are in the 3850 CPU and port 4 and 5 on one of the 3851 Program Storage Units. These I/O:s are hooked to specific functions as shown in the table below.
  
  Port 0
  
  Port 1
  
  0 Right controller right
  1 Right controller left
  2 Right controller back
  3 Right controller forward
  4 Right controller counter clockwise
  5 Right controller clockwise
  6 Right controller pull
  7 Right controller push
  
  Port 4
  
  Port 4 has double duties and serve left controller
  as well as horizontal video position.
  
  0 Left controller right
  1 Left controller left
  2 Left controller back
  3 Left controller forward
  4 Left controller counter clockwise
  5 Left controller clockwise
  6 Left controller pull
  7 Left controller push