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The TI-84 Plus is a graphing calculator made by Texas Instruments which was released in early 2004. There is no original TI-84, only the TI-84 Plus and TI-84 Plus Silver Edition models. The TI-84 Plus is an enhanced version of the TI-83 Plus. The key-by-key correspondence is relatively the same, but the 84 features some improved hardware. The Archive (ROM) is about 3 times as large, and CPU about 2.5 times as fast (over the TI-83 and TI-83 Plus). A USB port and built-in clock functionality were also added. The USB port on the TI-84 Plus series is USB On-The-Go compliant, similar to the next generation TI-Nspire calculator, which supports connecting to USB based data collection devices and probes, and supports device to device transfers over USB rather than over the serial link port.〔(USB Peripherals for the 84+ - ticalc.org )〕 The TI-84 Plus Silver Edition was released in 2004 as an upgrade to the TI-83 Plus Silver Edition. Like the TI-83 Plus Silver Edition, it features a 15 MHz Zilog Z80 processor and 24 kB user available RAM. The chip has 128 kB, but TI has not made an OS that uses all of it. Newer calculators have a RAM chip that is only 48 kB. All calculators with the letter H or later as the last letter in the serial code have fewer ram pages, causing some programs to not run correctly. There is 1.5 MB of user-accessible Flash ROM. Like the standard TI-84 Plus, the Silver Edition includes a built-in USB port, a built-in clock, and assembly support. It uses 4 AAA batteries and a backup button cell battery. The TI-84 Plus Silver Edition comes preloaded with a variety of applications. These programs are also available for the TI-84 Plus, but some must be downloaded separately from TI's website. It is manufactured by Kinpo Electronics. TI offers a special yellow version of the TI-84 Plus, inscribed with the words "School Property", for schools to loan out to students. This special design was produced in effort to combat theft.〔(School Bus Yellow for TI-84 Plus )〕 Owners can buy other interchangeable colored face-plates and slide-cases online. A kickstand-style slide case and other accessories are also available. Although graphing calculators have been called inexpensive in education reform research,〔(Graphing Calculator Intensive Calculus )〕 the TI-84 Plus Silver Edition costs $139.00 as of 2013 on the TI online store. This calculator has been discontinued in favor of the TI-84 Plus C Silver Edition. In 2011, TI launched for the French market a miniaturized version of the TI-84 Plus : (the TI-84 Pocket.fr ). In 2012, TI launched for the Asian market a miniaturized version of the TI-84 Plus Silver Edition : (the TI-84 Plus Pocket SE ). The TI-84 Plus C Silver Edition was first publicly referenced in October 2012 in a tweet from TI.〔https://twitter.com/seemathrun/status/256867680974422017〕〔(【引用サイトリンク】 title=TI-Planet : L'histoire de la découverte de la TI-84+ C Silver Edition... )〕 Even though this tweet had gone unnoticed, in November 2012, it was discovered〔(【引用サイトリンク】 title=Cemetech - News - TI-84 Plus C Color-Screen Calculator Discovered )〕 through a leak from a pilot class that TI was developing a color-screen TI-84 Plus, tentatively called the TI-84 Plus C Silver Edition. It has a high-resolution 320x240-pixel color screen, a modified version of the 2.55MP operating system, a rechargeable battery and keystroke compatibility with existing math and programming tools. It has the standard 2.5mm I/O linkport and a mini-USB port. More details about the calculator's math and programming features were published when TI began distributing review models in February 2013,〔(【引用サイトリンク】 title=Hands-On with the TI-84 Plus C Silver Edition: Full Review - Cemetech - News )〕 and even more when the calculator was released in 2013. The TI-84 Plus CE was publicly previewed by TI Education in January 2015.〔(【引用サイトリンク】 title=TI-84 Plus CE Graphing Calculator by Texas Instruments )〕 The calculator retains the 320x240-pixel color screen, rechargeable battery, and key layout of the TI-84 Plus C Silver Edition, while removing the 2.5mm I/O ("DBUS") linkport and moving the USB port and charging LED to the right side of the handheld.〔(【引用サイトリンク】 title=A First Look at the TI-84 Plus CE )〕 The calculator's OS 5.0 appears to be incompatible with the TI-84 Plus C Silver Edition's OS, and little is yet known about the calculator's internal architecture. Vernier reports that the calculator will have 150KB of user-accessible RAM and 3.0MB of Archive memory.〔(【引用サイトリンク】 title=TI-84 Plus CE )〕 ==Software== There are three different types of programs which can be downloaded or programmed into the calculators: TI-BASIC, Z80 assembly language, and Flash applications (also written in Z80 assembly). In addition, there are programs available that are able to compile or interpret other programming languages. There are a wide range of applications that this produces, from science classes, to games, to calculus to note taking (when put together with a separately sold keyboard). The TI-84 Plus Series is exactly like its predecessor in that it can be used on the SAT and ACT examinations as well as International Baccalaureate examinations. However, in some cases those administering the exam may reset the calculator's memory beforehand to prevent cheating through the use of built in programs or other data.〔(【引用サイトリンク】url=http://education.ti.com/educationportal/sites/US/productDetail/us_ti84pse.html )〕 When OS 2.30 was initially released, users noticed the speed of graphing was greatly reduced. The explanation was that the update added asymptote checking in graphing.〔(【引用サイトリンク】url=http://calcg.org/cgi-bin/forum.cgi?t=7896 )〕 In January 2006, Texas Instruments released v2.40 of the operating system for the TI-84 Plus series. The most noticeable addition to the new OS was the "Press-To-Test" feature that allowed a teacher to disable any programs installed on the calculator, so they cannot be used on tests, etc.〔(【引用サイトリンク】url=http://education.ti.com/sites/US/downloads/pdf/press_to_test_ti84p.pdf )〕 As of OS version 2.53MP which was released in February 2010, support was added for prettyprinted expressions. However, some programs stopped working correctly in this OS version, or were running slower.〔(TI-OS 2.53 Released for TI-84+ Family - ticalc.org )〕 The current OS version is 2.55MP which was released in January 2011.〔(Release Notes for TI-84 PLUS OS Version 2.55MP )〕 In July 2009, a community-made patch now allows user-made operating systems to be easily uploaded onto the TI-84 plus series. Shortly after the patch was developed, the RSA keys for the calculator's operating system were factored via the General number field sieve (GNFS) algorithm, making a software patch unnecessary. In response to this, Texas Instruments released a newer hardware revision which only accepts other, stronger RSA keys, making it harder to load user-made operating systems or older TI operating systems (2.53MP and earlier). The community has found a way around the newest limitation by discovering a way to revert to older versions of the boot code. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「TI-84 Plus series」の詳細全文を読む スポンサード リンク
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