VSI Modem Link Interface

  • The VSI Modem Link is a user port device for computers like the Commodore 64 and 128. It is housed in a plastic assembly approximately the size of most C64 cartridges, with a top-mounted female DB-25 for connecting to an RS-232C device.

    Assembled (Top)
    Case Top (Underside)
    Top


    Assembled (Bottom)
    Case Bottom (Underside)
    Bottom


    The Modem Link is unlike many other interfaces of its kind both physically and electrically. While most interfaces have the port facing the rear or side, the Modem Link’s DB25 is mounted so that it points straight up. Inside, the Modem Link consists of only discrete components (resistors and transistors), unlike the integrated circuits found in most others. A slide switch selects between Hayes and 1670 compatibility modes.