Just posted a comprehensive demo design of a control circuit bus with fCPU, as much RAM and ROM as you can eat, and some essential i/o devices:

viewtopic.php?p=686490

Straightforward to adapt to whatever situation you may have, with copy and paste. Code included.

Here's cb750mark's RAM and i/o bus demo design for fCPU. Many thanks to extermeon and KonStg for an outstanding mod!

bus-demo.png

Includes, top to bottom:
- 1 timer device (up to 4 counters)
- 1 recipe lookup device (includes mock command button for testing)
- 1 ROM cell
- 6 RAM cells
- fCPU ...