Editing TI-BASIC (section)

=== Third-party language extensions ===
Third-party applications, in chronological order Omnicalc,<ref>ticalc.org. [https://www.ticalc.org/archives/news/articles/6/62/62080.html Omnicalc v1.00 Released] {{Webarchive|url=https://web.archive.org/web/20240614230434/https://ticalc.org/archives/news/articles/6/62/62080.html |date=2024-06-14 }}</ref> xLIB,<ref>Evans, Travis.  [https://www.ticalc.org/archives/news/articles/14/146/146528.html xLIB by Patrick Prendergast] {{Webarchive|url=https://web.archive.org/web/20240614230744/https://ticalc.org/archives/news/articles/14/146/146528.html |date=2024-06-14 }}</ref> Celtic, and Doors CS,<ref>Sutherland, Nikky. [https://www.ticalc.org/archives/news/articles/14/146/146642.html Find an Oasis in Doors CS 7.0] {{Webarchive|url=https://web.archive.org/web/20231127142330/https://www.ticalc.org/archives/news/articles/14/146/146642.html |date=2023-11-27 }}</ref> have overloaded TI-BASIC functions on the Z80 calculators to provide additional language functionality.  The third-party libraries overload the <code>sum()</code>, <code>real()</code>, <code>det()</code> and <code>identity()</code> functions, which are handled and interpreted by their respective applications.  Among the extra functions are fast shape-drawing routines, sprite and tilemap tools, program and VAT modification and access abilities, GUI construction features, and much more, most of which are ordinarily restricted to use by assembly programmers.  All of the functions require that an application like [http://www.ticalc.org/archives/files/fileinfo/430/43068.html Doors CS 7.0] be present on the user's calculator, sometimes considered a detraction to the use of the libraries.