TI-81

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TI-81

A 1994 TI-81 showing graphs
Type	Graphing calculator
Manufacturer	Texas Instruments
Introduced	1990
Discontinued	1997[1]
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[2]
Programming
Programming language(s)	TI-BASIC, Assembly
User memory	2400 bytes of RAM
Other
Power supply	4 AAAs, 1 CR1616 or CR1620

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 Since its release, it has been superseded by a series of newer calculators: the TI-85, TI-82, TI-83, TI-86, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, TI-84 Plus C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.