Trying to decide where to go with this, so I'm studying the CPU's signaling and comparing the documentation with reality. Mostly matches up, which is encouraging. 6/n

If you like this please go follow @deech. He is wise.

Rock on. Serial works in both directions and I can send typos as well as commands (in this case eventually displaying the contents of the status register). Need to tidy up what I have so far, then I'll work on adding some RAM. 5/n

Life! I added a bunch of wires stuff and I now get serial output on reset, which is decoded at the bottom of the oscillogram: CRLF, the PC as six octal digits, CRLF, and an `@` prompt, exactly as expected! Now I need to hook up an RS-232 transceiver and see if I can give it commands from a terminal. 4/n