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Gathering DS flashcard knowledge - DIY "opencard" idea
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<blockquote data-quote="NathaanTFM" data-source="post: 10271550" data-attributes="member: 440562"><p>Quick update on the cartridge: I have ordered a new prototype that is correctly wired to the SPI chip, and it seems to work (at least with DSi and 3DS - don't have a regular DS)</p><p></p><p>I haven't implemented the SPI protocol yet (between the console and the cartridge), which prevents commercial games cannot find their EEPROMs and seems to prevent them from booting. So I tried with a kiosk demo ROM and it seems to work!</p><p></p><p><img src="https://www.nathaan.com/uploads/e2ea46bbe88ffc810d2ac6b79bd4bc67.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="width: 350px" /><img src="https://www.nathaan.com/uploads/9012f530914f0e9d613d6b4d08652a85.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="width: 272px" /></p><p></p><p>I haven't implemented any kind of NDS whitelist bypass, so I'm testing on homebrew consoles for now. Again, I'm planning on open-sourcing it when it's in a correct state. I still need to implement the EEPROM chip (for saving) and reduce power usage.</p><p></p><p>I have started working on this because I wanted a way to distribute a custom homebrew game without having to buy individual flashcarts or cracking every console (this is why I'm using a FLASH NOR memory instead of a MicroSD card).</p><p></p><p>For other technical details, the ROM headers are barely modified so it transfers at the same rate as a commercial game (6.7 MHz, same gaps). The only modified value is the 4 character code - because I was too lazy to change the command decryption values. The uC is clocked at 150MHz and the transfers are handled by DMA (with GPIO).</p><p></p><p>EDIT: Seems like the issue is not related to the EEPROM, but to ROMs with filesystems (for some reason, the console seems to fail reading the cartridge after booting?)</p></blockquote><p></p>
[QUOTE="NathaanTFM, post: 10271550, member: 440562"] Quick update on the cartridge: I have ordered a new prototype that is correctly wired to the SPI chip, and it seems to work (at least with DSi and 3DS - don't have a regular DS) I haven't implemented the SPI protocol yet (between the console and the cartridge), which prevents commercial games cannot find their EEPROMs and seems to prevent them from booting. So I tried with a kiosk demo ROM and it seems to work! [IMG width="350px"]https://www.nathaan.com/uploads/e2ea46bbe88ffc810d2ac6b79bd4bc67.jpg[/IMG][IMG width="272px"]https://www.nathaan.com/uploads/9012f530914f0e9d613d6b4d08652a85.jpg[/IMG] I haven't implemented any kind of NDS whitelist bypass, so I'm testing on homebrew consoles for now. Again, I'm planning on open-sourcing it when it's in a correct state. I still need to implement the EEPROM chip (for saving) and reduce power usage. I have started working on this because I wanted a way to distribute a custom homebrew game without having to buy individual flashcarts or cracking every console (this is why I'm using a FLASH NOR memory instead of a MicroSD card). For other technical details, the ROM headers are barely modified so it transfers at the same rate as a commercial game (6.7 MHz, same gaps). The only modified value is the 4 character code - because I was too lazy to change the command decryption values. The uC is clocked at 150MHz and the transfers are handled by DMA (with GPIO). EDIT: Seems like the issue is not related to the EEPROM, but to ROMs with filesystems (for some reason, the console seems to fail reading the cartridge after booting?) [/QUOTE]
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