Guys, Got one of these coming any day now IF anyone's in need of loaning it in future to do some diagnostics of your poorly Atari 8bit - just shout/pay the post and have it as long as you need it... SUPER SALT ATARI 400 800 XL DIAGNOSTIC CARTRIDGE They really are pretty cheap anyway and you might fancy building one over here for a relatively cheap amount: (DIY) SUPER SALT DIAGNOSTIC CARTRIDGE FOR ATARI 800XL - Share Project - PCBWay