One of the more famous of these devices is the 74181, a cascadable 4-bit arithmetic logic unit, or ALU. An ALU is the heart of a microprocessor, performing its operations. The 74181 appeared in ...

Built as an educational demonstrator, this is a complete arithmetic-logic unit (ALU) using discrete relays — and not high-density types either — these are the big honking clear-cased kind.

THE collection of tales and song-texts given in this volume was made during a stay of ten months in Alu and Mono, Bougainville Strait, in 1908–9. The author has given the texts as taken down ...