TI-81
A 1994 TI-81 showing graphs
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| Type | Graphing calculator |
|---|---|
| Manufacturer | Texas Instruments |
| Introduced | 1990 |
| Discontinued | 1996 |
| Successor | TI-82 |
| Calculator | |
| Entry mode | D.A.L. |
| Precision | 13 digits |
| Display size | 96×64 pixels, 16×8 characters |
| CPU | |
| Processor | Zilog Z80 |
| Frequency | 2 MHz |
| Programming | |
| Programming language(s) | TI-BASIC, Assembly |
| User memory | 2400 bytes of RAM |
| Other | |
| Power supply | 4 AAA's, 1 CR1616 or CR1620 |
The TI-81 is the first graphing calculator made by Texas Instruments. It was designed in 1990 for use in algebra and precalculus courses. Since its original release, it has been superseded several times by newer calculators - the TI-82, the TI-83, the TI-83 Plus, TI-83 Plus Silver Edition, the TI-84 Plus, the TI-84 Plus Silver Edition, and most recently the TI-Nspire and TI-Nspire CAS; most of these share the original feature set and 96×64-pixel display that began with this calculator.
The TI-81 is powered by a Zilog Z80 microprocessor, like those used in almost every other Texas Instruments graphing calculator (except the TI-80, TI-89, TI-89 Titanium, TI-92, TI-92 Plus, Voyage 200 and TI-Nspire series). However, the processor runs at only 2 MHz whereas the other Z80-powered Texas Instruments calculators run at a speed of at least 6 MHz (the TI-83 Plus Silver Edition, TI-84 Plus, and TI-84 Plus Silver Edition run at 15 MHz). It contained 2400 bytes of RAM.
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