Finally received the delivery I was waiting for to start building something.  This is the clock circuit.  It's pretty much an exact copy of Ben Eater's 8 bit computer clock.  Starting from the left: A 555 circuit to generate and adjustable square wave clock that can run as slow as 0.5 Hz.  Second, another 555 circuit to debounce a pulse that will be fed into the output logic for single stepping.  Third, a final 555 circuit to debounce the enable circuit that feeds into the output logic to select from the single step or clock.  Red button is single step pulse, beside the toggle for the select.  Next are two quad nand 7437 for the output logic.  Second chip is not used yet.  Will be used to generate inverse clock, and halt for DMA.

No need to comment on the crappy soldering job on my power input.