I was thinking about using a hexadecimal control switch and ended up pondering what alternatives exist. For example, how about a quadrature encoder and an up-down counter. There appear to be a couple of quadrature encoder interface chips: LS7083N (also LS7183N*) and ELM403. update: see notes below for more on LS7… One comes from LSI Computer …
Read full article: updated: musing on hexadecimal control