On a completely different note (excuse the pun) here’s part of a simple design I did a while ago. Really need to crack on with it at some point. 16 steps, up/down/up&down, push button control all up and running across a couple of breadboards. Got most of it drawn up including a couple of 7 segment displays and variable gate per step. All done with (at the time) readily available CMOS logic. In fact I think the only discontinued part, in DIP package, is the 4067 mux. Shouldn’t be difficult to use a couple of 4051’s for example.
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