>Many years ago I put a system using several Z80s and a PDP-11 many years ago I wired up my own design for an 8080 system, but i was a self taught beginner and

>Many years ago I put a system using several Z80s and a PDP-11 many years ago I wired up my own design for an 8080 system, but i was a self taught beginner and not very good at stuff like a capacitive RC debounce circuit so I couldn't get my single-step-the-CPU button to work. I was reading the spec sheet for the processor and I realized I could kluge it with signals. There was something like a "memory wait" pin, and another one called something like "halt", but one fired on the leading edge of the clock, and the other on the trailing edge, so I was able to use a SPDT push button and a flip flop to single step halt/memory wait on the first bounce, and then restart only on the first bounce when the button was released.