The PSM BCKVM accessory mates to the back of the PSM with matching headers and hole pattern.

Provides:

Battery power via two AA cells

Real-time clock with lithium battery backup

Video, Keyboard, and Mouse connector

Here's a circuit diagram (needs cleaning up!):

 

Here are some photos:

Fully assembled with servo and extra cap:    (Mounted to PSM)

Kit comes partially assembled: 

Close ups of completed unit:  

Parts to complete kit: 

 

Questions?                >>>>