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The Hewlett-Packard 9100A (HP 9100A) is an early programmable calculator [3] (or computer), first appearing in 1968. HP called it a desktop calculator because, as Bill Hewlett said, "If we had called it a computer, it would have been rejected by our customers' computer gurus because it didn't look like an IBM. We therefore decided to call it a ...
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.
It cost US$395 (about £165), but despite the price, over 300,000 were sold in the three and a half years for which it was produced. [1] [2] From 1971, Texas Instruments had been making available the building block for a simple calculator on a single chip [3] and the TMS0803 chipset appeared in a number of Sinclair calculators.
The Sovereign was one of the last calculators produced during Sinclair's foray into the calculator market that had started with the Sinclair Executive in September 1972. [1] The Executive had retailed for £80 when introduced, but in little over a year it was possible to purchase a Sinclair calculator for £20 and by November 1976 a model was ...
The Cambridge was extremely small for a calculator of the time: [1] it weighed less than 3.5 ounces (99 g) and measured 50 by 111 by 28 millimetres (2.0 in × 4.4 in × 1.1 in). Power was supplied by four AAA batteries. [5] The use of cheap components was an important contributor to the unit's cost.
This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory;
The calculator was superseded, in 1982, by the HP-15C.. Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator ...
The HP-65 was one of the first calculators to include a base conversion function, although it only supported octal (base 8) conversion. It could also perform conversions between degrees/minutes/seconds ( sexagesimal ) and decimal degree ( sexadecimal ) values, as well as polar/cartesian coordinate conversion.
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