|User Memory||25 KB RAM
64 KB flash ROM
|Firmware Memory||512 KB|
|Power supply||4 AAA's,
1 CR1616 or CR1620
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.
Technical specifications 
- Zilog Z80 CPU, 6 MHz
- Flash ROM
- 512 KB with 128 KB available for Flash Applications
- 32 KB with 25 KB available to the user
- Text: 16×8 characters
- Link port
- 50 button built-in interface
- 4 AAA batteries plus 1 lithium battery for backup
- Integrated programming languages
- Wilson, Brandon (Feb 24, 2009). "Chameleon - ticalc.org". Retrieved May 12, 2009.
See also 
- Features of the TI-73 Explorer
- Some TI-73 programs and the Chameleon utility can be found at ticalc.org and several others at CalcG.org.
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