Picking up an old ATARI 2600 on the weekend to add to this.. doesn't the ATARI have the Signetics 2650A chip inside? From memory, these and the old stand alone keyboard computers like the Commodore64 had this chip as an interface.

2600 comes with the paddles... and.. PONG! LOL.
Will buy a bundle of games from Ebay etc and keep in the shop with the TV until the shed gets extended.. more distractions.. just what I need!