Except the use of time relay to control the pressure maintaining and cooling, the rest all takes a route switch to control the ordinal operation and speed changes for each hydrocylinder.
The designers of these circuits based them on the same concept: a fully integrated, single-die-IC switching regulator and a micropower operational amplifier.
However, the additional phases of the E1 and E2 waves of a HEMP are also going to put further telecommunications at risk, as well as other electronics and control systems, relays, power lines, and tower structures.
It was a computer that calculated the day of the week For the date, which of course is a fairly simple calculation, but at the time this was all wired up with relays and rotary switches and so forth.
These in turn gave way to ever smaller and more capable electrical devices in which numbers were crunched by relays, valves and ultimately transistors.