Here's a view of the bottom of the station showing all the connectors. There are provisions inside for two-frequency operation, however this does not seem to be supported by the programming software and the various modules.
Battery backup and trickle charging seems to be a standard feature but some supplies don't have these components. Note that it has a second board over much of the left half. For comparison, here's a photo of a fully populated (tone remote) control board (picture found on the web): Jan DD8OA sent in a photo of a German MC-Compact base station's fully populated control board. The big cable in the middle goes to the DB25 jack.
Here's a photo of the two radios the receiver is on the left (RF board facing up, missing a VCO shield and an overall board shield), the transmitter is on the right (command board facing up). The RF and command boards used by the receiver and transmitter are not interchangeable since unnecessary parts have been left off depending on the intended use. The circuitry is nearly identical and anyone familiar with those radios can easily work on the R100. They're both made for 5 kHz deviation channels (25 kHz channel spacing) the programming software says you can enter frequencies that are divisible by 5 or 6.25 kHz, implying frequencies on 12.5 or 25 kHz increments (probably depending on the band). The receiver and transmitter are almost clones of Radius/MaxTrac radios. There are markings indicating that the control board and receiver radio could be configured as a single radio base station, which is a totally different product. The stations were commonly interfaced to telephone phone patches or desk sets.
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