Things I built that are not books. Soviet machines nobody had emulated, and one, the ternary Setun, that plenty of people had, which is either a specialism or a symptom.
Iskra-226
The first working emulation of a Soviet Wang 2200 work-alike, built because I had a disk from 1989 that nothing on earth could read. Runs in your browser, fourteen disks to choose from.
Promin-2
Severodonetsk, 1967, and you programmed it by punching metal foil: a hole is an erased command, metal is a contact. Reconstructed from the scanned card archive, eight cards and eighty command slots, and it runs the π card against its own stored constant to check itself.
Setun, 1958
The Soviet balanced-ternary computer, the one machine here I did not have to emulate first. My own reading of it, carried over from a Python reference and checked against it for 551,182 steps without one out of step. Runs in your browser; companion to Ternary Dreams.