TI-81
The TI-81 was the first graphing calculator made by Texas Instruments. It was designed in 1990 for use in algebra and precalculus courses. Since its release, it has been superseded by a series of newer calculators: the TI-85, TI-82, TI-83, TI-86, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, TI-84 Plus C Silver Edition, TI-Nspire, TI-Nspire CAS, TI-84 Plus CE, and most recently, the TI-84 Plus CE Python. Most of them share the original feature set and 96×64-pixel display that began with this calculator, with the exceptions of the TI-84 Plus C Silver Edition and the TI-84 Plus CE family.
A 1994 TI-81 showing graphs | |
| Type | Graphing calculator |
|---|---|
| Manufacturer | Texas Instruments |
| Introduced | 1990 |
| Discontinued | 1997 |
| 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 | 5 MHz or 6 MHz |
| Programming | |
| Programming language(s) | TI-BASIC, Assembly |
| User memory | 2400 bytes of RAM |
| Other | |
| Power supply | 4 AAAs, 1 CR1616 or CR1620 |
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