The Retro Port is a special adapter for the SNES/Super Famicom similar to the Super GameBoy, except it plays NES games.
More info about this device can be found in this video (courtesy of Satoshi Matrix).
• 100th Video Special - RetroBit RetroPort V...
The game tested on this console is a PAL copy of Mario and Yoshi, and is being recorded with a Dazzle.
I think this adapter was designed for use with NTSC NES games rather than PAL because I noticed the music is faster than what it was intended to be. The audio quality isn't brilliant too.
Also when I recorded this with my Dazzle, I had to record it in NTSC mode even though I was using a PAL SNES. I think that's because I had to connect the RCA Cable from the cartridge and it puts out it's own signal.
If I had another adapter I could play Japanese Famicom games on this thing but I would rather not make my SNES balance a big tower of cartridges.
Also available is the Retro Gen which adapts MegaDrive and Genesis games onto a SNES, but it doesn't allow you to play 32X and MegaCD games, and I don't know if it'll allow you to use a Power Base Converter to play Master System games on it.