I built two NOP testers, simple standalone devices to do a simple sanity check test if this CPU is at least doing something that can be expected. Not a thorough test of speed, instructions, all address lines or datalines or control lines.
Another article from the Dutch KIM Kenner magazine: RECORDING PROGRAMS WITH THE KIM-1 AND THE CASSETTE RECORDEROrigin...
Stephen Crozier made a clone of the Unilab Three Chips main board.
Thanks to Mathias Ohlerich for the scan of the Sonderheft 2