[phyrrus9]

So I know all of you are familiar with at least the concept of vacuum tubes in computing history, but who can say they can actually build things out of them?

Take a look at the below screenshot, which is a diagram for a pretty basic analog single-purpose computer. In this case, it would have 2 dials and 3 screens. Dials labeled A and B (the VRs in here), with corresponding voltmeter displays (also shown), and then a voltmeter labeled Q.

This diagram shows a simple computational circuit that runs the function

Code:

-2 * (A + B)

Of course, there are more interesting circuits, but I don't want to write them up and have no interest. Let me know if you want to learn about this stuff.

btw, you can play with the simulator of this circuit here