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2. Electronic organizer - Wikipedia

   en.wikipedia.org/wiki/Electronic_organizer

   An electronic organizer (or electric organizer) is a small calculator-sized computer, often with an built-in diary application and other functions such as an address book and calendar, replacing paper-based personal organizers. Typically, it has a small alphanumeric keypad and an LCD screen of one, two, or three lines.

3. Sinclair Executive - Wikipedia

   en.wikipedia.org/wiki/Sinclair_Executive

   The calculator was significantly smaller than any of its competitors, and the first that could easily be carried in a pocket. [3] [1] According to a Sinclair executive quoted in the Financial Times, "one must always bear a packet of cigarettes in mind as the ideal size", possibly a quip on Clive Sinclair's smoking habit. [10]

4. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.

5. Pocket computer - Wikipedia

   en.wikipedia.org/wiki/Pocket_computer

   A pocket computer is a class of handheld computer characterized by very short displays (typically accommodating only one or a handful of lines of text) and calculator-style alphanumeric keypads. Pocket computers occupy a small footprint, allowing the unit to be comfortably stashed in one's pocket when on the go, and usually weigh less than 1 ...

6. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...

7. Psion Organiser - Wikipedia

   en.wikipedia.org/wiki/Psion_Organiser

   Launched in 1984, [3] the Psion Organiser was the "world's first practical pocket computer". [4] Based on an 8-bit Hitachi 6301-family processor, running at 0.9 MHz, with 4 KB of read-only memory (ROM) and 2 KB of static RAM and has a one-row monochrome liquid crystal display (LCD) screen.