Viatron System 21 Model 2111 Restoration

Here are a number of pictures taken prior to the restoration and clean up of the Viatron System 21 Intelligent terminal.  It was definitely a haven for spiders but the main unit looks very clean otherwise.  There is some excellent information on Viatron and the System 21 Intelligent terminal on Wikipedia here: https://en.wikipedia.org/wiki/Viatron   I was very fortunate to have received several documents with the terminal including schematics.  You can find the documentation at this link in my Files Area under Viatron System 21.

Of special note is the fact that this terminal, designed in 1968, was the first device to use the term “microprocessor”.   Today, we think of this term as a single chip CPU device.  In this case, there are actually two “microprocessor” boards with a variety of chips on them.  They are pictured below with all of the other internal cards.  This particular example was built in early 1970 given the date stamps on the chips.

Pictures of the main unit.  Note, these are pictures of how I received the unit (still needed cleaning).

The main unit was actually very clean.  The immediate concern was the keyboard as it had this white residue that was chalky like calcium and I wan’t sure if I could get it off without damaging the key caps.

You can see the light channels under the key shafts. Depending on the key pressed, the light coming from the left side would be blocked by the unique fingers per key shaft so that the optical sensors on the right would see the unblocked light and determine what key was pressed. The light channels are also forged metal so this definitely adds to the weight (at 21 lbs just for the keyboard!).

From the post-restoration pics below, you can see that it turned out quite nicely.

Here are the internal cards (boards) within the card cage by slot number for my reference: