To build on Guy’s comments, the following may help you..
BeoCom 2 Basic and BeoCom 2 System have the same hardware and look the same.
Only the software is different.
BeoCom 2 Basic = software version 1.3
BeoCom 2 System = software version 2.2
A software readout on the display is made by pressing following keys on the BeoCom 2 keyboard:
9#9#9 then INT then OK
BeoCom 2 MK II is different from BeoCom 2 Basic and BeoCom 2 System as it has a smaller contact plate
on the plug for base/charger.
See the photo below.
