ROMs originales


Anti-piratage #

AP (Anti-Piracy) is a method used by developers to enforce legitimate purchases and prevent piracy. Cela peut être contourné soit depuis le lanceur, soit depuis la ROM elle-même.

  • For nds-bootstrap, it can load an .ips file in order to circumvent said patches. This .ips file will be applied by nds-bootstrap in RAM so you can keep the ROM files intact. A pack of .ips files is included with TWiLight Menu++
  • For Wood R4, these patches are included in the software itself, you will not need to modify the ROM itself

If there isn’t an .ips file for your ROM or your software doesn’t patch your ROM, you can try directly modifying the ROM itself using DS-Scene ROM Tool.

Cloneboot #

Cloneboot is when a game sends its own loaded ARM7 and ARM9 binaries to another console. Il est utilisé pour le téléchargement DS, pour le multijoueur avec une seule carte. Not all games that have single-card multiplayer use cloneboot, however.

Fichiers de sauvegarde #

Nintendo DS cartridges have 4 known save types:

  • EEPROM - Mémoire programmable effaçable en lecture seule
  • FLASH
  • FRAM - Mémoire d’accès aléatoire ferroélectrique
  • NAND - NOT-AND

There are different formats to use depending on the loader, but nds-bootstrap uses the raw .sav format. If you have a save in a different format, here is a website you can use to convert it: http://www.shunyweb.info/convert.php.

Assembly #

Assembly language is any low-level programming language with a strong connection between the language’s instructions and the processor’s instructions. On the DS, assembly code comes in the form of either ARM or THUMB instructions, THUMB instructions being a subset of the ARM instructions. THUMB is useful to save memory bandwidth as it uses 16-bit instructions over the regular 32-bit instructions that ARM uses.

You can find more information on assembly instructions, as well as a lot more technical information for the DS and DSi, on GBATEK.

Lecture DMA de la carte #

DMA (Direct Memory Access) is a more efficient way to read data than using the CPU. When data is being transferred, code can still execute, so it is the preferred way of accessing data.

You can spot a game that uses DMA in no$gba by enabling the DMA log on ARM9. A DMA access to the card uses AF000001 as the third parameter.

  • Par exemple : DMA2 : 04100010 023C18C0 AF000001

Code de triche d’Action Replay #

Action Replay cheat codes are codes that allow you to make low-level programmable changes in the memory region of your favorite game(s). These changes range from simple value tweaks to extremely advanced ASM tweaks, both of which can alter the experience of the game(s) being played altogether.

Flashcards can take advantage of cheat codes by using cheat databases. Cheat functionality is integrated within the flashcard kernel respectively. The following kernels can utilize cheats:

  • Wood R4 (usrcheat.dat)
  • YSMenu (usrcheat.dat)

Homebrew/digital-based solutions can also take advantage of the cheat databases, the software currently available can use the following:

  • NitroHax (cheats.xml)
    • NitroHax lets you use cheats with real Game Cards from a flashcard. Le moteur utilisé ici charge toute la base de données cheats.xml dans la RAM limitée de la Nintendo DS et essaye de gérer les choses à partir de là. Cela impose une limite sérieuse sur le nombre de cheats que vous pouvez avoir, car NitroHax ne chargera pas un fichier cheats.xml au-delà de 2.4 Mo
  • NitroHax3DS (usrcheat.dat fork) (cheats.xml ou usrcheat.dat)
    • NitroHax3DS est une version de NitroHax qui fonctionne à partir de la carte SD du système sur DSi ou 3DS. La version originale utilise cheats.xml avec la même 2.4 Limite de Mo que le NitroHax d’origine, mais il y a aussi une branche qui charge les codes depuis une base de données usrcheat.dat sans limitation de taille
  • TWiLight Menu++ (usrcheat.dat)
    • TWiLight Menu++ lit le usrcheat.dat et envoie les valeurs de triche activées à un autre fichier, que nds-bootstrap récupère
    • Le moteur de triche utilisé dans nds-bootstrap est basé sur celui utilisé dans NitroHax. Cependant, en raison du fichier de triche ne contenant que des triches activées pour ce titre spécifique, il n’y a qu’une limite au nombre de triches pouvant être activées, et non une limite à la taille de la base de données

For the most complete cheat database, using DeadSkullzJr’s NDS Cheat Database is recomended.

Cheat codes generally have types 0 through F, and here is an (unfinished) description of them:

  • The 0xE code type is a 32-bit code type that allows you to make multiple writes in many consecutive addresses all at once. Essentially, it is like the basic 32-bit RAM write code type (0x0), except this doesn’t have addresses listed next the the values you want to write. Instead, the 0xE code type is programmed to automatically branch from a starting address, then determine the addresses to write to. From there, you just have to tack in the amount to write to in order for it to do the job
    • It is known that cheat codes of this type usually do not work with nds-bootstrap currently
  • DeadSkullzJr is working on a more comprehensive list of cheat code descriptions, this section will link to that once it is ready

Demonstration and Distribution Titles: #

Demonstration (Demo) titles are different from their retail counterparts in various ways. The obvious indicator being that the title at hand is a demo of what the retail version will be like, essentially it’s a sneak peek at what is coming in the future when the full retail release comes. In the case of the Nintendo DS line, these titles often are marked as “Not for Resale” on the title labels, each demo also sports a different title ID compared to their retail counterparts, and on the back of the title’s cartridge, a “Not for Resale” sticker is also present. These titles are usually just kiosk demos in promotional places in stores and what not.

Distribution titles are a slightly different situation in most cases, however demos can also fit the distribution label for a few titles in the library. Most cases distribution titles are just retail versions of the title(s) that are for display only or come from a promotional packaging of some sort. You can see “Not for Resale” labeled on these types of titles like you can with the demonstration titles. These can sometimes also be used in kiosks for the sake of letting other players test out the title. However knowing that these are essentially the same as their retail counterparts in most cases, they tend to have an extra identifier in the title ID on the label.

Example ID: DIS-NTR-NTRJ-JPN

DIS - Distribution

Title Labels #

Looking at the bottom of the title label shows the title ID along with other bits of information, for this example the following ID will be used:

  • NTR-NTRJ-XXX

XXX represents the following:

  • AUS - Australia
  • CHN - China
  • DEN - Denmark
  • EUR - Europe (Multilingual)
  • EUU - Europe (Dutch or Italian Only)
  • FRA - France
  • GER - Germany
  • HOL - Netherlands
  • ITA - Italian
  • JPN - Japan
  • KOR - Korea
  • NOE - Europe (German Only)
  • NOR - Norway
  • RUS - Russia
  • SPA - Spain
  • UKV - United Kingdom
  • USA - United States

The last letter of the title ID itself represents the language of the title. Using the last example’s title ID:

  • NTR-NTRX-JPN

X represents the following:

  • A - World (doesn’t count as only one thing used it)
  • C - Chinese (Simplified)
  • D - German
  • E - American English
  • F - French
  • G - Greek
  • H - Dutch
  • I - Italian
  • J - Japanese
  • K - Korean
  • M - Swedish
  • N - Norwegian
  • O - English (DSi Enhanced)
  • P - European Multilingual
  • Q - Danish
  • R - Russian
  • S - Spanish
  • T - English (DSi Enhanced)
  • U - Australian English
  • V - British English
  • W - Other languages (Varies)
  • X - Other languages (Varies)
  • Y - Other languages (Varies)
  • Z - Other languages (Varies)

In terms of the system identifiers:

  • NTR - Nitro - Nintendo DS
  • TWL - Twilight - Nintendo DSi

DSi Enhanced: #

Games with “DSi Enhanced” functionality are games that take advantage of some aspect of the DSi’s hardware while still remaining compatible with the DS Phat/Lite. These games are marked as TWL but still say “Nintendo DS” instead of “Nintendo DSi” on the label.