Enabling 3D graphing on graphing calculators has been one of my long-running fascinations. From early monochrome TI-BASIC experiments dating to at latest 2002, to C and z80 assembly 3D graphing applications for color-screen graphing calculators, they have been a constant thread woven through my hobby software development. With the release of the TI-84 Plus CE in 2015, I inevitably hoped to be able to port a 3D graphing program to it, although I was torn between two options that would each allow me to build on my previous work.

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Graph3DP is a powerful 3D graphing application for the Casio Prizm (fx-CG10/fx-CG20/fx-CG50). Created before any manufacturer-produced 3D graphing application was released, it provides a vital math tool, allowing up to six simultaneous 3D equations to be graphed and traced.

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Graph3DC is a 3D graphing App for TI-84 Plus C Silver Edition graphing calculators written entirely in z80 assembly. It integrates with the TI-OS, allowing students and teachers to switch quickly from 2D to 3D graphing mode to graph up to five simultaneous Z=f(X,Y) equations. Users can rotate and zoom functions, control graph colors and styles, set the graphing window, and trace over the mesh to find exact values at points.

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jsTIfied is an online graphing calculator emulator, emulating z80 calculators (TI-72, TI-82, TI-83, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, and TI-84 Plus C Silver Edition). Written in 2011, it runs entirely in-browser using HTML5 and Javascript, so it requires neither Java nor Flash, at the time a novelty.

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Invalid Tangram is a graphing calculator arcade game, a cross between Space Invaders and Tetris. It’s a port of a popular PC game by the same name written by Josh Szepietowski.

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mobileTunes 3.2 is a z80 assembly media player for TI graphing calculators that can play up to quadraphonic MOD music through the calculator’s serial-like I/O port.

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CALCnet 2.2 is a robust networking protocol and driver for two-wire devices, designed especially with timing for 6MHz TI graphing calculators. It is the culmination of a long-running, occasional project of mine dating to at least 2000, to allow more than two calculators to communicate at once. The final published version was demonstrated to work properly on networks of nearly a dozen calculators, and has also been tested on networks fragmented across large geographic areas.

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Doors CS is the ultimate shell for the TI-83 Plus/TI-84 Plus family of graphing calculators, written in z80 assembly. It’s packed with features for users, including running any BASIC or assembly program or game. For programmers, it has a wide variety of built-in libraries for assembly and BASIC programmers, for graphics, GUI, networking, math, data storage, and more.

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