ATARI JOYSTICK INTERFACE
AGF has now modified its joystick interface to accept standard Atari joysticks. The interface allows you to simulate the cursor keys on a Spectrum or ZX-81 plus second set of keys for a second player.
Much software uses cursor keys and AGF provides some demonstration software with each unit so you can look for the cheapest joysticks which can be used on Ataris - there is a range from Le Stick to Competition Pro.
AGF sells the interface at £20 and the address is 26 Van Gough Place, Bognor Regis, West Sussex PO22 9BY. You should indicate which machine you have.