Standard controller

The promotional controller was shown in Atari's marketing literature for the Video System X. Note the green and red "ATARI" keys, instead of * and #.

From Best Electronics: "This is a Very rare prototype Atari CX52 Joystick Flex Circuit. It uses the same type of Crinkle dome contact switches as used on the original Atari CX40 Joystick internal PCB board. Unfortunately this prototype sample Flex circuit does not work properly, so it was never used on CX52 Joysticks. Very few Atari people outside of Atari Engineering have ever seen this Rare one of a kind Prototype Atari 5200 Flex Circuit."