Sinclair Scientific

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.

Kindly donated by Geoff Marsh in Eaglescliffe.

Sinclair Cambridge (Type 3)

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

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

Kindly donated by George Dawson in Leeds.

Texas Instruments TI-1030

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

Kindly donated by George Dawson in Leeds.

Imperial 99T

The Model 99T was a pocket electronic calculator from Imperial Business Equipment Limited in the UK, which features an eight-digit VFD display and is powered by four AAA batteries.

Psion Organiser II XP

The Psion Organiser was a range of pocket computers developed by the British company Psion in the 1980s. The Organiser II (launched in 1986) competed with the Filofax, and can be considered the first practical personal digital assistant (PDA) in that it combined an electronic diary and searchable address database in a small, portable device.