collapseos/recipes/ti84

TI-84+

This is a work-in-progress, this is far from complete.

Recipe

This recipe gets the Collapse OS shell to run on the TI-84+, using its LCD screen as output and its builtin keyboard as input.

Build the ROM

Running make will result in os.rom being created.

Emulate through z80e

KnightOS has a handy emulator, z80e for TI calculators and it also emulates the screen. It is recommended to use this tool.

Once z80e is installed (build it with SDL support) and os.rom is created, you can run the emulator with:

z80e-sdl -d TI84p --no-rom-check os.rom

You will start with a blank screen, it's normal, you haven't pressed the "ON" key yet. This key is mapped to F12 in the emulator. Once you press it, the Collapse OS prompt will appear.

WIP: the keyboard does nothing else than halting the CPU for now.

Upload to the calculator

WARNING: the instructions below will wipe all the contents of your calculator, including TI-OS.

To send your ROM to the calculator, you'll need two more tools: mktiupgrade and tilp.

Once you have them, you need to place your calculator in "bootloader mode", that is, in a mode where it's ready to receive a new binary from its USB cable. To do that you need to:

1. Shut down the calculator by removing one of the battery.
2. Hold the DEL key
3. But the battery back.
4. A "Waiting... Please install operating system now" message will appear.

Once this is done, you can plug the USB cable in your computer and run make send. This will create an "upgrade file" with mktiupgrade and then push that upgrade file with tilp. tilp will prompt you at some point. Press "1" to continue.

When this is done, you can press the ON button to see Collapse OS' prompt!