HorizonM

utility background process for the Nintendo 3DS (codename "Horizon")

HorizonM is licensed under the GNU GPLv3 license. See LICENSE for details.

Current features

• screen streaming using HorizonScreen
• VRAM corruptor (hold ZL+ZR)

Credits

• Minnow - figuring out that Base processes can be used
• ihaveamac - pointing me towards the right direction for fixing memory allocation on new3DS and getting HorizonScreen to compile on macOS
• Stary - help with WinSockets in HorizonScreen
• NekoWasHere @ reddit - betatesting
• JayLine_ @ reddit - betatesting

Building

• instlall devkitARM (bundled with devkitPro)
• make

See nested projects for more info about building.

Getting started

//TODO usage

• Install HorizonM.cia using an application manager

  • For end-users FBI is recommended (optionally with sockfile.py)
  • For contributors and developers socks is recommended for faster testing debugging

• Install HzLoad.cia or HzLoad_HIMEM.cia (for high memory mode on old3DS systems) using an application manager

  • Look in the nested HzLoad project directory for compiling instructions

• Open HzLoad or HzLoad_HIMEM and wait for the RGB LED to turn light blue

  • Look at the troubleshooting section for help if the console softlocks on a black screen or the RGB LED has a color other than light blue after the launcher exits
  • Look in the nested HzLoad project directory for HzLoad-specific issues and troubleshooting steps

• Press and hold START+SELECT until the RGB LED turns off to exit HorizonM

  • Look at the troubleshooting section for help if the the RGB LED didn't turn off after a small amount of time

## Troubleshooting

RGB LED color codes

• off -> off ??? - failed to start HorizonM at all
  • old3DS: not enough memory
  • general: HorizonM is not even installed
  • contrib/dev: check if rsf doesn't contain invalid entries
• off -> static red - HorizonM failed to enter the main loop, it means that it softlocked or crashed during initialization
  • contrib/dev: check rsf permissions
• anything -> static white - a C++ exception occurred (most likely memory allocation failure)
• anything -> bright yellow - wait4wifi(), waiting for wifi availability
• bright yellow -> blinking dark yellow - failed to reinitialize networking (due to a program bug or a failed race condition)
• anything -> blinking dark yellow - hangmacro(), indicates a fatal error that didn't crash the process
• light blue -> rapid flashing red - failed to create the network thread (out of resources)
• light blue -> green - network thread started, initializing stuff
• green && pink blink - connection estabilished with HorizonScreen
• green -> flashing pink&yellow - disconnected, waiting for cleanup
• flashing pink&yellow -> light blue - successfully disconnected from HorizonScreen
• anything -> dark blue - HorizonM failed to finalize services, it means that it softlocked or crashed while finalizing services
  • contrib/dev: SOCU_ShutdownSockets() may have failed or blocked the main thread

And if you order now, you'll get 2 data aborts for the price of one!