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The Nintendo DS has 802.11b wireless networking hardware capable of communicating at 2 Mbps.
Wireless Protocols

   * DS Download Play (Wireless MultiBoot) Protocol
   * Pictochat Protocol? 

Wireless Hardware

Sgstair has completed a draft document on the wireless hardware in the Nintendo DS, for all to enjoy.
Memory Regions
Address Section Purpose
0x04800000 0x04800FFF Wifi Control Registers
0x04801000 0x04803FFF Passive mirrors of control registers
0x04804000 0x04805FFF MAC memory (tx data, rx data, wep keys)
0x04806000 0x04807FFF Passive mirrors of control registers

Notes:

   * The MAC memory is general purpose RAM, read/writable as halfwords.
   * The passive mirrors do not trigger action on reads (e.g. the read FIFO at 0x04800060 does not pop a value when read via a mirror)
   * This pattern is mirrored all the way to 0x04FFFFFF. 

For more information:

   * Wireless Basics
   * Register List
   * Operation
   * Wifi Standard (off-site link)
   * Packet Captures 


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