Casio CQ-1

The Casio CQ-1 “Computer Quartz” is a pocket calculator and clock, with an 8-digit VFD display and four functions: stop-watch, alarm clock, date, calendar, and calculator.

Casio DC50

The Casio DC-50 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 40 keys, and an LCD.

Casio FX-82 Super

The Casio FX-82 Super is an arithmetic calculator with 10+2 digits precision and algebraic logic.

Casio FX-82B

An earlier variant of the fx-82 series, the fx-82B has an 8+2 digit display.

Casio FX-82L

A later variant of the fx-82 series, the fx-82L is nearly identical to the fx-82D but with a larger display. It can use fractions for operations, and has two different normal displaying modes. Technically it was identical to the earlier fx-82C and fx-82D.

Casio FX-85N

The Casio fx-85N is a scientific calculator with 8 digits precision and algebraic logic – it has 44 keys, an liquid crystal display (LCD), and a small solar panel for powering the calculator.

Casio FX-100D

The Casio FX-100D is a scientific calculator with 10 digits precision and algebraic logic. It has 44 keys, and an LCD (liquid crystal) display.

Casio FX-115S

The Casio fx-115s is a scientific calculator with 10 digits precision and formula input logic. It has 383 functions, 24 keys, and an LCD (liquid crystal) display, and is powered by a solar panel and mercury cell.

Casio H1 (H-1)

The Casio H1 (H-1) is a low-cost calculator with an eight-digit VFD display powered by two AA batteries, designed for home use.

Casio Personal M-1

The Casio Personal M-1 (H-813) is a low-cost calculator designed for home use.

Commodore LC 925

The Commodore LC 925 is a pocket calculator with an 8-digit LCD display.

Citizen 100L

The Citizen 100L is a mains-powered portable calculator with a 10-digit GDT display.

Elka 103

The Elka 103 is an arithmetic calculator with 8 digits precision and algebraic logic, manufactured in Bulgaria using parts from the USSR. It has 8 functions, 20 keys, and an LED display typical of calculators of this era, and is powered by 4 x AA batteries.

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.

Kovac K-80D

The Kovac K-80D is a portable calculator with a nine-digit GDT display, powered by four C-cell batteries.

Lloyds Accumatic 321

The Lloyds ACCUMATIC 321 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 11 functions, 28 keys, and a VFD display, and is powered by 4 x AA batteries.

Monroe-Litton 620

The Monroe 620 is a four function electronic calculator with a thirteen-digit nixie tube display, which uses fixed decimal point logic, with the decimal point location selected via a rotary switch on the keyboard panel.

Psion Organiser II CM

The Psion Organiser was a range of pocket computers developed by the British company Psion in the 1980s. The Organiser II CM (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.

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 XP is a later variant, identical to the CM but with more onboard memory.

Kindly donated by Tom Askew.

Psion Series 3a

The Psion Series 3 was a range of clamshell personal digital assistants developed by the British company Psion in the 1990s, as a replacement for the earlier Organiser II range.

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.

Sharp CS-1122

The CS-1122 is a semi-portable mains-powered calculator with an eleven-digit VFD display.

Sharp EL-120

The Sharp EL-120 “Elsi Mate” is a compact portable calculator with a number of unusual features, including an early multi-function fluorescent display tube with only three numeric digits, a “count” button on the lower edge which increments the integer display by one unit, and a 15cm ruler on the underside. Power is supplied by three AA batteries.

Sharp EL-509S

The Sharp EL-509S is a scientific calculator with 10 digits precision and algebraic logic. It has 48 functions, 38 keys, and an LCD (liquid crystal) display. The power source is 2×1.5V cell.

Sharp EL-8018

The Sharp EL-8018 “Elsi Mate” is a compact portable calculator with a nine-digit VFD display. Power is supplied by two AA batteries.

Sharp EL-8100

The Sharp EL-8100 “Elsi Mate” is a compact portable calculator with a nine-digit VFD display. Power is supplied by four AA batteries.

Sharp ZQ-1050

The Sharp ZQ-1050 (10KB) and ZQ-1250 (34KB) are electronic organisers with nine integrated functions (calendar, address book, memo pad, scheduler, calendar, expenses, anniversary, clock, alarm, and 10-digit calculator), which competed with personal digital assistants (PDAs), having a separate 62-key QWERTY keyboard with arrow keys and a dot matrix LCD display with 3 lines by 14 characters.

Sharp ZQ-5200

The Sharp ZQ-5000 (32KB) and ZQ-5200 (64KB) are electronic organisers with seven integrated functions (calendar, address book, memo pad, clock, world clock, and calculator), which competed with personal digital assistants (PDAs), having a separate keyboard with arrow keys instead of a touch-sensitive screen with stylus. They had QWERTY-style keyboard and a 96 x 64 dot matrix LCD display, arranged as 8 lines by 128 characters of 5 x 7 pixels.

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.

Texas Instruments TI-2500

The Texas Instruments TI-2500 Datamath was a professional pocket calculator with an early LED display and a rechargeable NiCd battery pack. Several different iterations exist of the TI-2500; mine is the second generation with a full-length mainboard.

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 colourful keyboard.

Kindly donated by George Dawson in Leeds.

Texas Instruments TI-30

In 1985, Texas Instruments rebranded the TI-30 range with a new scientific calculator following the TI-30 III, known only as the TI30, which used the electronics from the slimline TI-35. There were four variations of the TI30, released in 1985, 1986, 1987, and 1990 respectively.

Toshiba BC-1286

The Toshiba BC-1286 is a portable calculator with a thirteen-digit VFD display, powered by two D-cell batteries.