The Russians had a ‘thing’ for balanced ternary computers during the Cold War (parallel technological universes <i>et cetera</i>), and the last one developed in the west is reported as dating to 1973.<p><a href="https://en.wikipedia.org/wiki/Ternary_computer?wprov=sfti1" rel="nofollow">https://en.wikipedia.org/wiki/Ternary_computer?wprov=sfti1</a>