JG Components was the interface productor for the ZX Spectrum, the TC2048 and the TC2068, with the most diversified catalogue in the whole country. It had its’ headquarters in Rua Passos Manuel, in Porto.

All of its’ interfaces were assembled in a bow, with a very pleasing presentation, demonstration software and operating instructions. In 1986, the price of the interfaces varied from $2,200 to $4,400.

Perhaps the most famous one was the JOY III (Kempston joystick interface with two exits and a reset button). The most unusual, but extremely useful, was the MONITORSLOT which allowed to connect a Spectrum to a TV, with a Scart entry (composite video) without having to modify the computer.