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MITS 1440 Desktop Calculator

Image Courtesy Steve Shepard, April 1973 Radio-Electronics Magazine

MITS' second desktop electronic calculator. Introduced in early 1973, utilizing an extension of Electronic Arrays (EA) six-chip LSI calculator chipset, extended to provide additional functionality versus the EA chipset used in MITS' first electronic calculator, the 816. Additional functions include reciprocal (1/x), square root, and percent calculations, and added an accumulator-stype memory register.