Firmware: https://github.com/strickyak/spoonfeeder/blob/main/micropy/step5.py

Hardware cartridge: https://github.com/strickyak/spoonfeeder/tree/main/v1

This is what HALT/, E, A0, and R/W look like when HALT/ has been held down but is released and the 6809 starts executing instructions again:

This is spoon-feeding 2 instructions (6 bytes). The top signal is a debugging output to show the 6 fetch cycles being spoonfed. Then E, A0, and R/W. You can see R/W relax to a middle voltage when the CPU is Halted by HALT/.

My board in a Coco2 with the Pico W powered and oscilloscope probes.

The first two bytes I ever spoon fed: 'X' and 'Y' in the first to screen positions at addresses $0000 and $0001.

My circuit board. The middle and right are my hand-routing. The left came with the Prototyping board I based it on ( https://raw.githubusercontent.com/JayesonLS/TandyCircuitsAndLogic/master/CoCoProtoBoard/CoCoProtoBoard.png )