The MB STAR
system, when it made its debut, was much more capable because it was PC-based (IBM T30 laptop), but it was also very versatile
because it incorporated a HHT emulation mode (for backward compatibility) along with a "multiplexer" intermediate unit between the PC and the car,
which allowed the connection of a variety of different diagnostic connection cables, depending on which diagnostic system the car in question happened
to use. For the oldest cars (i.e. the C126, early R129 SL models, early W124s and W140s, etc.) a "four-pin" diagnostic cable was provided. For second-
generation cars, such as the E500E, 400E/E420, middle and later R129s, middle and later W140s, the familiar "38-pin" plug is provided. There are also
OBD-2 interface cables for model year 1996 and later cars, as well as a 14-pin cable for European diagnostic systems. All of these cables allow the
combination of the MB STAR with the in-line multiplexer unit to fully interface with any particular car's computers.