I needed to enhance my debug experience so I soldered a TIL311 debug board.
Having the TIL311 display the hexadecimal numbers read/written from/to ROM/RAM and inputed/outputed from/to I/O ports was a tremendous step forwards.
I also added a new blinkenlights PCB (I was prepared for 16 bits).
Also experimented with some LCD displays.
And built my own power supply for 3.3V, 5V and 12V.
Keeping my sessions reproducible was some proof of stability.