The Midasonic - C64 INTER 767B is an interface device for the Commodore C64 computer. With this device it is possible to use a Rushware mouse/joystick on the Commodore C64 computer. The extra power connectors are used when this interface is used with a Amstrad computer.
The device has an input (9 pin Sub-D), an output two (9 pin Sub-D), two power connectors and a switch for choosing the computer type.
Technical information about the Midasonic - C64 INTER 767B:
It is possible to build your own Midasonic - C64 INTER 767B replica with the information in the link below. I did spend hours and hours making and checking the PCB and schematic, but I can't guarantee that the drawings are perfect. If you build a Midasonic - C64 INTER 767B replica with this information, it is on your own risk. But if you are successful in building a replica, let me know!
The technical files for the Midasonic - C64 INTER 767B.