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TI-81: Difference between revisions
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{{Infobox calculator|name=TI-81|successor=[[TI- | {{Infobox calculator|name=TI-81|successor=[[TI-85]]|display_type=Dot-matrix LCD|prog_lang=TI-BASIC, Z80 assembly|introduced=1990|discontinued=1995|type=Graphing|entry=D.A.L.|display_size=96x64 pixels, 16x8 characters|precision=13|power=4x AAA + CR1620 Batteries|ports=None|memory_user=2400 Bytes|latest_firmware=V2.0V|manufacturer=Texas Instruments}} | ||
The '''TI-81''' was the first graphing calculator produced by Texas Instruments. | The '''TI-81''' was the first graphing calculator produced by Texas Instruments. | ||
== Features == | == Features == | ||
* Graphing up to 4 equations at a time | |||
== Programming == | == Programming == | ||
Programming on the TI-81 is far more limited compared to future models. All programs need to be typed in by hand, as there is no external connectivity of any kind. | |||
By default, it only allows writing programs in an early version of TI Basic. The programs are limited in memory consumption, and are all labeled from Prgm0-9, then PrgmA-Z, and Prgmθ. They can also be given a custom label, however. Each program is also limited in line count and total memory consumption. | |||
In 2009, an exploit was found that allows the user to type in machine code directly.<ref>https://ticalc.org/basics/calculators/ti-81.html</ref> A program loader called [https://ticalc.org/archives/files/fileinfo/425/42572.html Unity] followed in 2010, describing itself as an "extension of the calculator operating system". It allows the user to mix TI Basic and Z80 instructions in programs, and acts as a psuedo-shell, providing an abort key sequence in the event of an error. | |||
Due to the tedium and the limited amount of memory available, there aren't many programs available for the TI-81. What is available can be found on [https://ticalc.org/pub/81/ ticalc.org], where, as of the writing of this article, only '''187''' programs are archived. | |||
== See also == | == See also == | ||
== References == | |||
# [https://ticalc.org/basics/calculators/ti-81.html TI-81 - ticalc.org] | |||
# [http://www.datamath.org/Graphing/TI-81.htm Datamath Calculator Museum - TI-81] | |||