Calculators

Welcome to my calculator collection.

This page is a repository for all of the calculators and accessories in my collection – it’s currently a work-in-progress, and I’ll continue to add things as and when I have the time.

Sinclair Scientific

TypePocket calculator
Release dateMarch 1974
DiscontinuedJuly 1976
Operating systemNone
CPUTexas Instruments TMS0805
MemoryN/A

The Sinclair Scientific calculator was a 12-function, pocket-sized scientific calculator introduced in 1974, which dramatically undercut in price other calculators of the time. Significant modifications to the algorithms used meant that a chipset intended for a four-function calculator was able to process scientific functions, but at the cost of reduced speed and accuracy.

Sinclair Cambridge (Type 3)

TypePocket calculator
Release dateAugust 1973
DiscontinuedDecember 1975
Operating systemNone
CPUTexas Instruments TMS0805
MemoryN/A

The Sinclair Cambridge was a pocket calculator introduced in August 1973 by Sinclair Radionics. It was available both as kit form or assembled prior to purchase. The range comprised seven models: the original “four-function” Cambridge followed by the Cambridge Scientific, Cambridge Memory, two versions of Cambridge Memory %, Cambridge Scientific Programmable, and Cambridge Universal.

Rapid Data Rapidman 800

TypePocket calculator
Release dateFebruary 1972
DiscontinuedAugust 1974
Operating systemNone
CPUMostek MK5010P
MemoryN/A

The Rapid Data “Rapidman 800” was a low-cost hand-held calculator, achieved by using a one-piece injection moulding for the whole casing and keyboard, and a low-functionality “calculator on a chip” integrated circuit, plus 24 discrete transistors to drive the LED display.

Texas Instruments TI-1030

TypePocket calculator
Release dateJune 1978
DiscontinuedJuly 1980
Operating systemNone
CPUTP0311
MemoryN/A

The TI-1030 was the first US-built slimline calculator from Texas Instruments. It used a low-power CMOS integrated circuit manufactured by TI instead the Toshiba circuit in the previous TI-1750. A similar calculator with a more colorful keyboard was introduced with the TI-1070.

%d bloggers like this: