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'''CPU-X4''', formally known as the '''Japanese Nintendo DSi Prototype''', is a prototype that was used for development of Nintendo DS or DSi software. This unit is completely different from a retail unit.
'''CPU-X4''', formally known as the '''Japanese Nintendo DSi Prototype''', is a prototype that was used for development of Nintendo DS or DSi software. This unit is completely different from a retail unit; the TwiIPL repo leaked as a part of the [[Zammis Clark Breach|2020 Zammis Clark breach]] dates the software that this unit runs to to around April 2, 2008, several months before the release of the DSi.
==Surface==
==Surface==
<center><gallery>
<center><gallery>
File:DSidev front.jpg|Image of the front, turned on.
File:DSidev front.jpg|Image of the front, turned on.
File:DSidev_back.jpg|The back, with a yellow sticker translating to "For development only".
File:DSidev back.jpg|The back, with a yellow sticker translating to "For development only".
File:DSi-SDK-6291-Shell-2.png|Another image of the front, closed.
File:DSi-SDK-6291-Shell-2.png|Another image of the front, closed.
File:DSi-SDK-6291-Shell-3.png|A better image of the back.
File:DSi-SDK-6291-Shell-3.png|A better image of the back.
</gallery></center>
</gallery></center>
== Trading & dumping ==
==Trading & dumping==
Around May 2019, the console was sold for $750 to Voodooween, who is known for releasing Nintendo DS prototype roms and development kits. A full dump was made a few days later, using an exploit in '''Nintendo's NandApp''' testing app.
Around May 2019, the console was sold for $750 to Voodooween, who is known for releasing Nintendo DS prototype roms and development kits. A full dump was made a few days later, using an exploit in '''Nintendo's NandApp''' testing app.
==Plastic shell differences==
==Plastic shell differences==
* The DSi shell has a glossy finish, similar to the back of the top screen of a Nintendo DSi XL, and similar to some Nintendo DSi non-working shelf units. Nintendo does this often on pre-production shells.
* The button prints are darker than the ones you can find on a white retail Nintendo DSi. They're black instead of grey.
*The DSi shell has a glossy finish, similar to the back of the top screen of a Nintendo DSi XL, and similar to some Nintendo DSi non-working shelf units. Nintendo does this often on pre-production shells.
* There are no prints for '''POWER''', '''START''', '''SELECT''', or any of the icons for "on", "charging" or "wireless connections".
*The button prints are darker than the ones you can find on a white retail Nintendo DSi. They're black instead of grey.
* There are no prints on the back, only a yellow sticker translating to "Only for development".
*There are no prints for '''POWER''', '''START''', '''SELECT''', or any of the icons for "on", "charging" or "wireless connections".
* The SD Card slot opening mechanism is different. There is a small curve on the bottom, rather then opening it from the side.
*There are no prints on the back, only a yellow sticker translating to "Only for development".
* On the inside, there's a date molded in the plastic, suggesting this prototype is from May 23th 2008.
*The SD Card slot opening mechanism is different. There is a small curve on the bottom, rather then opening it from the side.
*On the inside, there's a date molded in the plastic, suggesting this prototype is from May 23th 2008.
==Unit settings==
==Unit settings==
There are some settings that can be found on a retail Nintendo DSi, but there are some debugging settings.
There are some settings that can be found on a retail Nintendo DSi, but there are some debugging settings.
* '''LANGUAGE''' - Changes the language. Depending on the console's region, there are 8 different languages. This specific unit was set to Japanese.
*'''LANGUAGE''' - Changes the language. Depending on the console's region, there are 8 different languages. This specific unit was set to Japanese.
* '''DATE & TIME''' - Allows you to change the time & date of the unit.
*'''DATE & TIME''' - Allows you to change the time & date of the unit.
* '''USER INFORMATION''' - Allows you to change user data, like the unit name, birthday and personal message.
*'''USER INFORMATION''' - Allows you to change user data, like the unit name, birthday and personal message.
* '''PARENTAL CONTROLS''' ''(Hidden)'' - Enables or disables Parental Controls, featuring a rating lock, target age, organization (CERO, PEGI or ESRB), set a password, a "Secret Question ID" and letting you change the secret question.
*'''PARENTAL CONTROLS''' ''(Hidden)'' - Enables or disables Parental Controls, featuring a rating lock, target age, organization (CERO, PEGI or ESRB), set a password, a "Secret Question ID" and letting you change the secret question.
* '''COUNTRY SELECT''' ''(Hidden)'' - Lets you change the country you live in. You can select every single country availbile across all final system versions.
*'''COUNTRY SELECT''' ''(Hidden)'' - Lets you change the country you live in. You can select every single country availbile across all final system versions.
* '''TOUCH PANEL''' - Allows you to calibrate the touch screen. The test mode is also different. Rather then having 4 dots in the corners, you can drag a cursor around the screen.
*'''TOUCH PANEL''' - Allows you to calibrate the touch screen. The test mode is also different. Rather then having 4 dots in the corners, you can drag a cursor around the screen.
* '''FREESOFT BOX''' ''(Hidden)'' - A debugging feature for the launcher, allowing you to change the amount of open application slots and filling them as well with a placeholder. On a retail DSi, there are 39 slots.
*'''FREESOFT BOX''' ''(Hidden)'' - A debugging feature for the launcher, allowing you to change the amount of open application slots and filling them as well with a placeholder. On a retail DSi, there are 39 slots.
* '''WIRELESS''' - Allows you to turn on or off wireless connections, like Nintendo WFC or Download Play.
*'''WIRELESS''' - Allows you to turn on or off wireless connections, like Nintendo WFC or Download Play.
* '''EULA''' ''(Hidden)'' - Forces the unit to accept or deny the EULA without going online. You can also accept different EULA versions.
*'''EULA''' ''(Hidden)'' - Forces the unit to accept or deny the EULA without going online. You can also accept different EULA versions.
* '''MACHINE CLEAN UP''' ''(Hidden)'' - Clears the user settings and formats the unit.
*'''MACHINE CLEAN UP''' ''(Hidden)'' - Clears the user settings and formats the unit.
==Board revision==
==Board revision==
On December 18th 2018, ProtonX released photos from the inside, confirming this was a prototype.
On December 18th 2018, ProtonX released photos from the inside, confirming this was a prototype.
{|style="margin: 0 auto;"
*There is no sticker on the board. Instead, Nintendo used permanent marker with '''A-2''' written on it.
| [[File:Board1.jpg|200px|center]]
*The board has '''CPU-X4''' writen on it. A retail Nintendo DSi has '''CPU-01''' writen on it. This is enough to confirm that this is a prototype, noted by Razor83:<blockquote>''Actually Ninty always uses '''X''' to denote prototype motherboard revisions, so '''X4''' means its the fourth prototype revision. When the motherboard is finished and final/retail they change it to '''01'''.''</blockquote>
| [[File:Board2.jpg|200px|center]]
*The battery slot and the left side of the DSi note '''C/TWL-SUB-X3'''. This could indicate parts from CPU-X3 were recycled.
| [[File:Board3.jpg|200px|center]]
| [[File:BatteryShell.jpg|200px|center]]
{| style="margin: 0 auto;"
|[[File:Board1.jpg|200px|center]]
|[[File:Board2.jpg|200px|center]]
|[[File:Board3.jpg|200px|center]]
|[[File:BatteryShell.jpg|200px|center]]
|}
|}
{|style="margin: 0 auto;"
{| style="margin: 0 auto;"
| [[File:DSi-SDK-6291-PCB-1-Small.png|250px|center]]
|[[File:DSi-SDK-6291-PCB-1-Small.png|250px|center]]
| [[File:DSi-SDK-6291-PCB-2-Small.png|100px|center]]
|[[File:DSi-SDK-6291-PCB-2-Small.png|100px|center]]
| [[File:DSi-SDK-6291-PCB-3-Small.png|75px|center]]
|[[File:DSi-SDK-6291-PCB-3-Small.png|75px|center]]
| [[File:DSi-SDK-6291-PCB-4-Small.png|250px|center]]
|[[File:DSi-SDK-6291-PCB-4-Small.png|250px|center]]
| [[File:DSi-SDK-6291-Shell-1.png|200px|center]]
|[[File:DSi-SDK-6291-Shell-1.png|200px|center]]
|}
|}
== Applications and software ==
==Applications and software==
The contents of the NAND are very sparse, with only 2MB of data stored. A total of 4 prototype applications are on the NAND, known as
The contents of the NAND are very sparse, with only 2MB of data stored. A total of 4 prototype applications are on the NAND, known as
*'''WiFi Firmware''' (0003000f/484e4341),
*'''Nintendo DS Cart Whitelist''' (0003000f/484e4841),
*'''WiFi Firmware''' (0003000f/484e4341),
*'''Settings''' (00030015/484e4241)
*'''Nintendo DS Cart Whitelist''' (0003000f/484e4841),
*'''Settings''' (00030015/484e4241)
*and '''Launcher''' (00030017/484e4141)
*and '''Launcher''' (00030017/484e4141)
The boot process is also simple. The Launcher checks for errors and tests itself before launching. If no cartridge is inserted and the unit tested itself good, it will boot the Settings app.
The boot process is also simple. The Launcher checks for errors and tests itself before launching. If no cartridge is inserted and the unit tested itself good, it will boot the Settings app.
<gallery widths="250px" heights="250px" mode=packed>
<gallery widths="250px" heights="250px" mode="packed">
File:DSi-SDK-6291-1.png
File:DSi-SDK-6291-1.png
File:DSi-SDK-6291-2.png
File:DSi-SDK-6291-2.png
<youtube>ph2fL4RTWJw</youtube>
<youtube>ph2fL4RTWJw</youtube>
== Notes ==
==Notes==
* The prototype did not come with a special cartridge or SD Card. The built-in software doesn't even interact with the SD Card.
* This is what ProtonX had to say when asked how he got the unit: <blockquote>''<s>Yeah, I'm unlikely to do a NAND dump, as I've never been part of the missing scene.</s> However, I did collect lots of development equipment at one point (I've got Wii U kits, GBA, DS, 3DS) which is where I got this.''</blockquote>
*The prototype did not come with a special cartridge or SD Card. The built-in software doesn't even interact with the SD Card.
* The previous/prototype battery died, so it was replaced with a retail one.
*This is what ProtonX had to say when asked how he got the unit: <blockquote>''<s>Yeah, I'm unlikely to do a NAND dump, as I've never been part of the missing scene.</s> However, I did collect lots of development equipment at one point (I've got Wii U kits, GBA, DS, 3DS) which is where I got this.''</blockquote>
*The previous/prototype battery died, so it was replaced with a retail one.
== Todo ==
==Todo==
Some cleanup (bits and pieces from formatting I've seen on The Cutting Room Floor) need to be done, as well as posting clean menu screenshots (also from the hidden menu's) and trying to trigger the launcher. Also need to include sources to images and footage, and change up some capital letters.
Some cleanup (bits and pieces from formatting I've seen on The Cutting Room Floor) need to be done, as well as posting clean menu screenshots (also from the hidden menu's) and trying to trigger the launcher. Also need to include sources to images and footage, and change up some capital letters.
