Once a month I go to a local flea market where sometimes – not very often – I find something on the junk dealers’ market stalls. I have “rebuilt” the complete system in two months: the first month I found the main unit, a broken control pad and the power supply unit; the second month, from the same seller, I got the light phaser, a working control pad, and a classic cartridge of Sonic The Hedgehog.
The console seemed not to be working; but after leaving it on for a couple of minutes and cleaning the contacts of the cartridge connector, the game’s initial startup screen appeared.
The main unit is quite simple: top case, motherboard and bottom case.
Apart from some scratches due to use or careless storage (it was kept in a box with a walkman and some other junk on top), the system was in good condition and just needed to be thoroughly cleaned.
On the back you can find the audio/video, antenna and power connectors.
The diagram on the front reminds you to insert the cartridge or card before turning on the unit.
To get more information about the history and technical details of the console, you can read the Wikipedia article.