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NI Multisim

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NI Multisim NI Multisim  (formerly  MultiSIM ) is an electronic schematic capture and simulation program which is part of a suite of circuit design programs, along with NI Ultiboard. Multisim is one of the few circuit design programs to employ the original Berkeley SPICE based software simulation. Multisim was originally created by a company named Electronics Workbench, which is now a division of National Instruments. Multisim includes microcontroller simulation (formerly known as MultiMCU), as well as integrated import and export features to the Printed Circuit Board layout software in the suite, NI Ultiboard. Multisim is widely used in academia and industry for circuits education, electronic schematic design and SPICE simulation. History Multisim was originally called  Electronics Workbench  and created by a company called Interactive Image Technologies. At the time it was mainl...
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Dual sim

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                                                                    Dual Sim
A dual SIM mobile phone is one that holds two SIM cards. Dual SIMs are popular in locations where lower prices apply to calls between clients of the same provider; they also allow separate numbers for personal and business calls on the same handset.
Devices that use more than two SIM cards have also been developed and released, notably the LG A290 triple SIM phone,and even handsets that can run on four SIMs, such as the Cherry Mobile Quad Q70.
History
The first phone to include dual SIM functionality was the Benefon Twin, released by Benefon in 2000. It wasn't until the late 2000s, however, when more dual SIM phones entered the marketplace and started to attract mainstream attention, most of them coming from small Chinese firms producing phones using Mediateksystems-on-a-chip.
Such phones were initially eschewed by major manufacturers due to potential pressure from telecommunications companies, but in the early 2010s Nokia, Samsung, Sony and several others followed suit, with the Nokia C2-00, Nokia C1-00 and Nokia C2-03 and most notably the Nokia X, phones from Samsung's Duos series, and the Sony Xperia Z3 Dual, Sony Xperia Cand tipo dual.

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