price: 12 USD platforms: C64
Allows you full access to the pins hidden inside your Commodore
According to the maker, the User Port Breakout Board is "probably the most simplistic accessory you could have for your Commodore".
It gives you access all the pins from the user port. Common uses include wifi modem connection, Arduino interfacing, controlling LEDs or relays.
the user port adapter is pre-soldered. You have a choice of male or female pin headers. (Soldering Required).