I wonder about early processor such as 4-bit microprocessor. Specifically I would like to know about the instruction set and see example program. I found one link about it but I didn't find any example programs. I would like to know the features of the Intel 4004 and see an instruction list. I have found a link to an emulator.
There's only one way to find out!
I expect that it would be well received. We already have questions on instruction sets of old processors so it wouldn't be out of place.