This adapter allows you to use a standard Atari type joysticks on the Sinclair +2 & +3 computers.
Source – http://www.amibay.com/showthread.php?57891-ZX-Spectrum-2-Megadrive-Joystick-hack
Andy's Retro Computing Collection
Retro & Vintage Computers, old consoles and classic gaming.
This adapter allows you to use a standard Atari type joysticks on the Sinclair +2 & +3 computers.
Source – http://www.amibay.com/showthread.php?57891-ZX-Spectrum-2-Megadrive-Joystick-hack