The 4004 is very interesting in just how mind-bogglingly odd it is. It's well worth reading the (very short) data sheet[1], or at least skim the available instr

The 4004 is very interesting in just how mind-bogglingly odd it is. It's well worth reading the (very short) data sheet[1], or at least skim the available instructions. I wrote a tiny 4004 program for one of the emulators out of curiosity, and it was a wild experience. [1] https://web.archive.org/web/20110601032753/http://www.intel.com/Assets/PDF/DataSheet/4004_datasheet.pdf https://web.archive.org/web/20110601032753/http://www.intel....