TI-81: Difference between revisions

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== 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.  
Programming on the TI-81 is far more limited compared to future models. All programs must 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.
By default, it only allows writing programs in an early version of TI Basic. They are all labeled from Prgm0-9, then PrgmA-Z, and Prgmθ. They can also be given a custom label. Each program is 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.
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.
Due to the tedium of typing in programs 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 ==
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