TI-89 series
The TI -89 (or TI89 ) is a graphing calculator, developed by Texas Instruments (TI). With its LCD that has a resolution of 160 × 100 pixels, so-called Extended flash memory as well as TI's Advanced Mathematics Software ( which allows the TI-89 to connect to the computer ), it is only by his bigger brothers, the TI- 89 Titanium, TI -92 Plus, the Voyage 200 and the TI -Nspire exceeded. Due to the small screen size and high resolution turned out that especially the elderly, or with a visual impairment have problems with the readability users.
The TI -89 has a Motorola 68000 microprocessor, which, depending on the hardware version of the calculator ( HW1, HW2, HW3 and the new TI- 89 Titanium HW4 ), clocked at 10 MHz or 12 MHz. The TI -89 has 256 KB of RAM ( of which 190 KB for the user accessible ) and 2 MB (or 4 MB for the TI- 89 Titanium ) to flash memory; thereof can the user take advantage of 700 KB and 2.7 MB. RAM and Flash ROM can be used to store variables, programs, spreadsheets, text files, lists, matrices, and even programs or games.
Features
Specifications
The TI -89 is practically a TI- 92 Plus without QWERTY keyboard and with a slightly smaller screen. One reason from which it was included in the range, is that calculator in the U.S. are indeed allowed on standardized tests, the TI -92 but was considered a computer because of the "real" QWERTY keyboard. In addition, the TI -92 many users was too clunky. TI -89 is significantly smaller than this. It also has a flash ROM, a further property, although the TI- 92 Plus, but did not have the original TI -92. The TI- 89 is not permitted at the U.S. ACT test, but its use during SAT ( college - choice test) is not prohibited.
The main advantage of the TI- 89 on its smaller siblings (which counts among other things, the TI -83) is the built-in Computer Algebra System (CAS). Hereby, the calculator can handle algebraic equations and solve for the unknown. The use of the command expand () ( parentheses triggers and powers on ) with the function " a * (2 c )" provides the result of "a * c 2 * a". If " ∫ (x 1, x) " are calculated, it shows the TI -89 " (x ^ 2) / 2 x " to. It can also solve equations; For example, "solve (x = y and y = x 7 / 3, x, { x, y} )" provides "x = 21/2 and y = 7/2 ". The TI -89 supports pretty print for genuine representation of equations.
In addition to the two-dimensional representation of functions, the TI -89 and also three-dimensional implicit function graph. The current operating system ( OS) of the TI -89 has the version number 2.09, the development of the operating system for the TI- 89 Titanium has arrived at OS 3:10.
Programming
On the TI -89, you can write small programs in TI- BASIC programming language which TI has derived from the popular BASIC programming language, directly itself. This is mainly suitable for smaller mathematical macros. Using a PC, you can also write programs in Motorola 68000 assembly language or C, this means TIGCC translate into machine language and load it via TI -Connect ( the newer version of the TI Graph Link program ) on the calculator.
Since 1998, thousands of programs for all areas of application have been developed. Some of the areas covered are mathematics, electronics, biology and a number of games. Many of these games are imitations of Tetris, Minesweeper, and other classics, but also a ZX Spectrum emulator, as well as a chess program. There is a development environment that runs directly on the calculator. They called ams -dev and consists of an IDE, side; an assembler ( asm ), as; a C compiler, cc; and a debugger ( db92 ).
2004 brought TI out TI- 89 Titanium, a more modern version of the TI -89, to replace him in the foreseeable future. This is a completely different case, twice as much flash memory (of which more than three times as much as before for the user accessible ) and a USB port. It originated with the new version of the hardware incompatibilities with some assembler programs. It is already working on several solutions; Most TI -89 programs running now properly on the new TI- 89 Titanium.
By shunting of a capacitor, it is possible to double the speed. Of this, however, is not recommended because the calculator could be destroyed by this.
Use
The TI- 89 is a member in some schools of the Federal Republic of Germany in the meantime to normal classes. So granted TI schools that want to use these devices regularly, even sponsorship. In some areas, this calculator is already provided ( for example, in some electrical engineering courses ). The ever-increasing spread of this ( and similar ) devices meant that there is now discussion groups in which it is explicitly talk about miscalculations of these devices. This informed teachers use this information to guide their students in mind that in spite of modern technology is still useful to also familiarize themselves with the tools of the trade and not blindly trust the technology.