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Ndless combines a resident program and utilities to open the TI-Nspire to third-party C and assembly development. Ndless is distributed under the Open Source Mozilla Public License.

The installation of Ndless on a TI-Nspire is required to be able to run assembly programs.

Find help for any Ndless related question or issues on the issue tracker.

Latest stable release: v4.2

Previous release: v4.0

Developing with Ndless

Tutorials and general information are available in the Development resources section.

Version upgrade

The executable format, the conventions and the header files are currently being defined and prone to change. Some changes are forced by This section describes the upgrade steps between the different releases of Ndless.

To v4.2 r2004

  • HW rev. W introduced a new 240x320px screen which breaks most Ndless programs.
  • A new API to make use of the different screen is now available, SCREEN_BASE_ADDRESS is only available in OLD_SCREEN_API (Add the define to the compile options) mode. See LCD API for information about the new API.
  • Nspire I/O does not yet support the new screen of HW rev. W and later. nSDL does, and programs that use it should work after recompilation.

From v3.9 to v4.2

  • Should work directly for most programs if they don't contain any OS-version specific addresses (SYSCALL_CUSTOM(), hooks, etc.)

From v3.6 to v3.9

  • Migration to newlib and libsyscalls. os.h and common.h shouldn't be used anymore. Use the standard C API directly.
  • Introduction of the new Zehn format. Makefiles need to be updated to use genzehn and make-prg.

From v2.0 to v3.1

  • Programs must be rebuilt to work on TI-Nspire CX because of several hardware changes. Programs with low-level accesses to hardware must also be slightly adapted: some hardware controllers have changed and their registers are laid out differently. The IO() macro can be used to select the address corresponding to the TI-Nspire model.
    • The LCD control register of the LCD controller has moved from C000001C to C0000018. Use IO_LCD_CONTROL instead.
    • The timer module has changed and has completely different registers
    • Programs are run in color mode. Add clrscr(); lcd_ingray(); at the beginning of a program ported from classic TI-Nspire to CX (the clrscr() avoids displaying color data that remains in screen buffer)
    • Keep the TI-Nspire classic user base in mind: make your programs compatible with both color and grayscale mode with the help of has_color . The color screen buffer is in R5G6B5 mode.
  • Programs which use show_msgbox() must be rebuilt with the new SDK, even for TI-NSpire classic
  • SYSCALL_CUSTOM(): the first parameter should now only contain OS v3.1 addresses.

From v1.7 to v2.0

  • Touchpad key map support: rebuild your programs with the SDK of v2.0, which includes an updated isKeyPressed() function. Make sure that the programs do not depend on keys specific to the Clickpad.

From v1.1.x to v1.7

C and assembly programs:

  • The syscall convention has changed, programs built with Ndless < v1.7 need to be rebuilt without any change to the code. This format should be compatible with the new OS versions once supported by Ndless, as long as backward compatibility can be kept.
  • Custom syscalls should be defined using SYSCALL_CUSTOM (see above)
  • The "PRG\0" signature before main() isn't required anymore, you can remove it
  • MakeTNS doesn't exist anymore. You must objcopy directly to the .tns file in your Makefile.
  • The program format is not specific to an hardware model anymore. You can now build your programs only once without defining NSPIRE_HARDWARE.
  • OS v1.1 is not supported anymore. Check that your programs still work on OS v1.7.
  • The program path is passed to the main function by following the C calling convention instead of using register r9

Assembly programs:

  • The way to call syscalls has changed: replace 'oscall <os_function>' with 'syscall(<os_function>)'

From v1.0 to v1.1

C and assembly programs:

  • Install the toolchain as described above. Your project doesn't need to follow the Ndless file tree anymore.
  • Adapt your Makefile based on src/arm/Makefile or src/arm/demo/Makefile
  • You may upgrade to the latest version of YAGARTO. Don't forget to delete any remaining *.o file before rebuilding a project.

Pure-assembly programs:

  • Make sure that the file extensions is in uppercase (.S)
  • Add the "main" symbol as described in the previous section
  • You do not need to define the symbol "_start" anymore