Ndless combines a resident program and utilities to open the TI-Nspire to third-party C and assembly development.

Ndless 1.7 is the latest stable release compatible with OS 1.7. This version is currently not compatible with the TI-Nspire Touchpad.
This topic is dedicated to discussions about this version.

Possible enhancements and known issues are available on the tracker.

You may browse the Development resources on Hackspire to start your own programs.

To build and hack into Ndless 1.7, follow src/doc/Ndess-Development.txt.

Ndless v1.1.1 is still available but support is dicontinued.

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Issues to be confirmed:

If you happen to come across one of them, please report it.

• (apcalc) Installation lost when turning the TI-Nspire on:
  Even though the calculator was not reset.  Reinstalling Ndless fixes this.
  
  
• (critor) Reboot when turning the TI-Nspire on:
  'particles' was run before turning it off.
  
  

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Your help is needed:

- Post any bug report, source-level if possible
- Help us to extend the list of supported syscalls
- Any details, diagnostic or patch which would help fixing the defects identified is extremely valuable

Information on the development version of Ndless is available here: http://www.unitedti.org/forum/index.php?showtopic=9284

(edit: cross post)

This thread may help you: http://groups.google.com/group/tinspire/browse_thread/thread/14673051437e304

DJ  Omnimaga: you'll need an on-calc installation, only once after a reset.

apcalc: Sorry for the annoyance for some of you. I prefer focusing on the next release which gets rid of the installer instead of trying to debug these issues.

gcc will sometimes emit calls to memset or memcpy functions if you initialize or assign large structures. Having them as macros won't help. I think we need to have real memset and memcpy functions in the library (even if all they do is call the OS functions).

In the next release of Ndless, OS calls will be defined as static inline functions. I'm not sure how GCC will react in this case.

when I tried it on Trapped, it complained of undefined references to memset and memcpy)!!

This is odd: this means you are using stdlib's memset/memcpy instead of the TI-Nspire OS's.
Does the .c which memsets/memcopies includes <os.h>?