A ternary ALU built from this course's adders

Add, subtract, negate and compare 9-trit registers. Subtraction is a flip and an add; an overflow past 9 trits is flagged.

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Where the numbers come from

gHashTag/t27 specs/ternary/trits.t27 (t27#8979): every value on the page is its fn bodies, compiled to wasm (logic.js), with 18 tests and 4108 runtime asserts
N. P. Brusentsov and others, the Setun computer, Moscow State University, 1958: a working balanced-ternary machine