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Amstrad emulator for Nintendo DS.

Based on Win-CPC by Ludovic Deplanque.

First version of CrocoDS was created for... Nintendo DS.


How to install?

  • To run homebrews on your Nintendo DS, you need to buy a special DS cartridge (linker) to plug into your Nintendo DS game port. This cartridge is like a game cartridge except you insert a Flash card into it.
  • First, connect the Flash card to your computer (using a Flash card reader)
  • Patch the .nds file with dldi if needed (
  • Copy the homebrew file (the .nds file) from the computer to the flash card.
  • Copy the .dsk (or .sna) file in the root (or in the /ROMS/CPC directory) of your flash card).
  • Then, get the Flash card and insert it into the special cartridge (linker).
  • Finally, plug this cartridge into your DS. That's all.
  • Switch on your DS and you will see a menu with the name of the homebrew file you've just transfered. Select it to run.

How to use?

  • Direction PAD & A/B: Joystick, keypad or keyboard emulation.
  • SELECT to display the setup menu.
  • To load a ROM, just press 'Select' to display the menu. Select the game and play.

How to compile?

To compile crocods Modify ds_rules from

%.nds: %.arm9
    ndstool -c $@ -9 $<
    @echo built ... $(notdir $@)


%.nds: %.arm9
    ndstool -c $@ -9 $< -7 $(ARM7BIN)
    @echo built ... $(notdir $@)


CrocoDS Copyright (c) 2013 Miguel Vanhove, Kyuran

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see


This Project is based upon the following work:

  • Win-CPC: Amstrad CPC Emulator - Copyright 2012 Ludovic Deplanque.
  • Caprice32: Amstrad CPC Emulator - Copyright 1997-2004 Ulrich Doewich.
  • GFX: Copyright 2007 Kukulcan.
  • GFX (keyboard): Copyright 2013 Jean-Jacques Cortes


Should run on: any Nintendo DS with a decent linker that is supported by DLDI


Version 2.0 (11-9-2007)

  • Save-states (load, read & erase).
  • New design. (thanks to kukulcan)
  • Bugfixes with the autostart.
  • Beter support of the copy, shift, control and caps-lock keys.
  • Single / multi-keys pressed for activate cheat code.
  • Minor update in the Z80 emulation.
  • Bugfixes in the timing of the sound module. (thanks to Alekmaul)
  • All options are now available via icons.
  • Screen capture (you need sna2png to convert the snapshot to bitmap)
  • Speed limitator. (crocods is sometimes too fast)

Version 1.0 (1-12-2007)

  • New keyboard 3/4.
  • Resize of the automatic screen.
  • More interlacing at the time posting of the screen.
  • The scrolling of the screen (Via the key R) now also functions into horizontal.
  • The sound is of better quality.
  • Support of ROMs zippées functional.
  • Support of the DLDI in order to be compatible with all old linkers and to come.
  • the change of pallet is again possible for each line. (possible modification via the menu hack)

Version 0.5a (12-25-2006)

  • Full mapping of keyboard.
  • New menu.
  • Load disk with or without autoload.
  • Realtime for most of the games.
  • Overscan screen display.
  • Press R to scroll up / down the screen.
  • Stereo sound. (pretty crappy)
  • Roms can be stored in the root, ROMS or AMES directory.
  • Zip roms suported.

Version 0.4a (12-9-2006)

  • Certain games did not function any more of with a bad interpretation of opcode HALT. It is now corrected.
  • Addition of a menu allowing the posting of the framerate.

Version 0.3a (2006)

  • Large increase in speed (real time on much of plays)
  • New module CRT which brings the support of the overscan (Thank you Demoniak)
  • Beginning of a design for the keyboard
  • Finely of configuration (green monitor color)
  • The sound functions (but there remains a problem of envelope of volume)

Check updates on my blog "My Ketchup is Dead" at Feel free to (e)mail us for anything..