Comment by nayuki

> Doin’ It With A 555: One Chip to Rule Them All

> We also know that microcontrollers implement logic gates – AND, OR, NOT, NAND, etc. But you don’t have to deal with those complicated logic functions, or worse, the software that runs on those microcontrollers. Get down to brass tacks and use hardware (555 ICs and 555 timer ICs, to name a few the only important ones) that just works!

Come on, you haven't even described how to implement combinational logic using 555 timer chips. Just show us how to build NAND, please.