UHF RF Signal Modulator Adapter for the Amiga 500 / A500 - Dismantled for reference and curiosity
Released for use with the Commodore Amiga 500 / A500 personal computer, the Amiga 520A MOD was basically a way to get around having to use a dedicated Amiga monitor and instead use your old, blurry CRT TV.
The 520A MOD converted / modulated the Amiga's native video output to a UHF RF signal that users could tune into a spare channel on most televisions. The A520 MOD also offered composite video out and an audio in port.
Unfortunately all bar a few of the first released units, the A520 provided horribly low quality images leading some to think this was a ploy to encourage people to buy the proper Amiga monitors.
Andecdogally, with the removal of a number of components and a little rewiring the A520 will output full bandwidth S-Video.
Basically a bulky add-on that for most barely did what it was meant to and seems designed to do less than promised in the area of video. That said, providing audio was a huge bonus for a many users.