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The Arithmometer, invented in 1820 as a four-operation mechanical calculator, was released to production in 1851 as an adding machine and became the first commercially successful unit; forty years later, by 1890, about 2,500 arithmometers had been sold [16] plus a few hundreds more from two arithmometer clone makers (Burkhardt, Germany, 1878 ...
50 by 111 by 19 millimetres (1.97 in × 4.37 in × 0.75 in) (Scientific) 73 by 155 by 34 millimetres (2.9 in × 6.1 in × 1.3 in) (Scientific Programmable) The Sinclair Scientific was a 12-function, pocket-sized scientific calculator introduced in 1974, dramatically undercutting in price other calculators available at the time.
It was only available as a mail-order kit, and cost around £11. [ 1 ] [ 2 ] Despite the difficulty in assembling the kit due to the small size of the parts and their variability in specification, 10,000 were sold around the world. 20,000 were exported to the United States , but most went unsold and were returned to Sinclair. [ 2 ]
The Interface Loop could also be used with the HP-71B, HP-75 and HP-110 computers. Extension slots of the HP-41CX. HP-41 extension (or expansion) modules allowed the user of an HP-41 programmable calculator to extend the functionality of the machine. The HP-41 had room for up to four expansion modules at the back of calculator.
The original Speak & Spell was the first of a three-part talking educational toy series that also included Speak & Read and Speak & Math.This series was a subset of TI's Learning Center product group and the Speak & Spell was released simultaneously with the Spelling B (a non-speech product designed to help children learn to spell), and the First Watch (designed to teach children to read ...
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7.5625 × 3.59375 × 0.75 Only CAS model 2011 154.99 (CAS: 162.99) Allowed Only non-CAS model is allowed TI-Nspire CX II, TI- Nspire CX CAS II: ARM9 @ 396 MHz 64 MB of RAM, 100 MB of Flash ROM 320×240 pixels (16-bit color) 7.5625 × 3.59375 × 0.75 Only CAS model 2019 165 (CAS: 175) Allowed Only non-CAS model is allowed Calculator CPU RAM
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