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The WiFi module might deserve it's own documentation
I'm going to clean this up, promise.
If this module is disconnected, the DSi turns on to a black screen.
picture of a rev0 WiFi module
http://www.flickr.com/photos/micahdowty/3846960965/sizes/o/in/photostream/
picture of a module from a later revA DSi
note the flash chip is different and very tiny
pdf: datasheet for rev0 SPI flash
On my board, pin 5 is connected to ground through a 10k resistor. This would seem to write-protect the first 64k
If this module is disconnected, the DSi turns on to a black screen.
picture of a rev0 WiFi module
http://www.flickr.com/photos/micahdowty/3846960965/sizes/o/in/photostream/
picture of a module from a later revA DSi
note the flash chip is different and very tiny
pdf: datasheet for rev0 SPI flash
On my board, pin 5 is connected to ground through a 10k resistor. This would seem to write-protect the first 64k