| Type | Graphing calculator |
|---|---|
| Manufacturer | Texas Instruments |
| Introduced | 1998 |
| Predecessor | TI-80 |
| Calculator | |
| Entry mode | D.A.L. |
| CPU | |
| Processor | Zilog Z80 |
| Frequency | 6 MHz |
| Programming | |
| Programming language(s) | TI-BASIC |
| User Memory | 25 KB RAM 64 KB flash ROM |
| Firmware Memory | 512 KB |
| Other | |
| Power supply | 4 AAA's, 1 CR1616 or CR1620 |
TI-73 series are graphing calculators made by Texas Instruments.
The original TI-73 was originally designed in 1998 as a replacement for the TI-80 for use at a middle school level (grades 6-9). Its primary advantage over the TI-80 is its 512 KB of flash memory, which holds the calculator's operating system and thereby allows the calculator to be upgraded. Other advantages over the TI-80 are the TI-73's standard sized screen (as opposed to the TI-80's smaller screen), the addition of a link port, 25 KB of RAM (as compared to the TI-80's 7 KB of RAM), and a faster 6 MHz Zilog Z80 processor (as compared with the TI-80's 980 kHz proprietary processor). The TI-73 also uses the standard 4 AAA batteries with a lithium backup battery (instead of the TI-80's 2 CR2032 lithium batteries).
In 2003, the TI-73 was redesigned with a sleek new body shape and redesignated the TI-73 Explorer to indicate its currently intended use as a bridge between the TI-15 Explorer and similar calculators and the TI-83 Plus, TI-84 Plus, and similar calculators.
Due to lack of demand in middle schools, the TI-73 and TI-73 Explorer have not been huge sellers for TI and are not carried by most retail stores. Most American upper-level middle school algebra courses generally tend to use the TI-83 or TI-84 families instead of the TI-73 or TI-73 Explorer, while most basic middle school math courses generally do not use graphing calculators, instead opting for scientific calculators such as the TI-30 or TI-34 families.
Originally the TI-73 could only run programs written in TI-BASIC, although that has changed in recent years. In 2005 an assembly shell called Mallard was released for the TI-73. Mallard allows the user to run programs written in assembly language. As with the TI-82 and the TI-85 before, a hacked backup file is downloaded containing the assembly shell.
Released in early 2009, the Windows utility Chameleon allows a user to load the TI-73 Explorer with a slightly modified TI-83+ firmware, giving it nearly equivalent functionality.[1]
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