diff --git a/content/SUMMARY.md b/content/SUMMARY.md
index 26152a7..587494f 100644
--- a/content/SUMMARY.md
+++ b/content/SUMMARY.md
@@ -11,6 +11,7 @@
     * [DS Sound](ds_sound.md)
     * [DS Peripherals](ds_peripherals.md)
     * [DS WiFi (Mitsumi)](ds_wifi.md)
+        * [DS WiFi I/O Map](ds_wifi_io_map.md)
 * [DSi Introduction](dsi_introduction.md)
     * [DSi I/O Map](dsi_io_map.md)
     * [DSi Control Registers](dsi_control_regs.md)
diff --git a/content/ds_wifi_io_map.md b/content/ds_wifi_io_map.md
new file mode 100644
index 0000000..1cb42a4
--- /dev/null
+++ b/content/ds_wifi_io_map.md
@@ -0,0 +1,275 @@
+# DS WiFi I/O Map
+
+The following registers are only accessible from the ARM7. They are located at
+addresses 0x4808000 to 0x4808FFF. Addresses not included in the following list
+aren't used. Also, many of the registers that are used aren't understood.
+
+Important note: 8-bit writes don't work on WiFi registers and RAM, they are
+ignored.
+
+<a id="general_registers"></a>
+## General registers
+
+| Address | Access | Name              | Description                           |
+|---------|--------|-------------------|---------------------------------------|
+| 4808000 | R      | `W_ID`            | Chip ID
+| 4808004 | R/W    | `W_MODE_RST`      | Reset
+| 4808006 | R/W    | `W_MODE_WEP`      | WEP and software modes
+| 4808008 | R/W    | `W_TXSTATCNT`     | Beacon status request
+| 480800A | R/W    | `W_X_00A`         |
+| 4808010 | R/W    | `W_IF`            | WiFi interrupt request flags
+| 4808012 | R/W    | `W_IE`            | WiFi interrupt enable
+| 4808018 | R/W    | `W_MACADDR_0`     | Hardware MAC address
+| 480801A | R/W    | `W_MACADDR_1`     | Hardware MAC address
+| 480801C | R/W    | `W_MACADDR_2`     | Hardware MAC address
+| 4808020 | R/W    | `W_BSSID_0`       | BSSID
+| 4808022 | R/W    | `W_BSSID_1`       | BSSID
+| 4808024 | R/W    | `W_BSSID_2`       | BSSID
+| 4808028 | R/W    | `W_AID_LOW`       |
+| 480802A | R/W    | `W_AID_FULL`      |
+| 480802C | R/W    | `W_TX_RETRYLIMIT` | TX retry limit
+| 480802E | R/W    | `W_INTERNAL`      |
+| 4808030 | R/W    | `W_RXCNT`         | RX control
+| 4808032 | R/W    | `W_WEP_CNT`       | WEP encryption enable
+| 4808034 | R?     | `W_INTERNAL`      |
+
+<a id="power_registers"></a>
+## Power registers
+
+| Address | Access | Name           | Description                              |
+|---------|--------|----------------|------------------------------------------|
+| 4808036 | R/W    | `W_POWER_US`   |
+| 4808038 | R/W    | `W_POWER_TX`   |
+| 480803C | R/W    | `W_POWERSTATE` |
+| 4808040 | R/W    | `W_POWERFORCE` |
+| 4808044 | R      | `W_RANDOM`     |
+| 4808048 | R/W    | `W_POWER_048`  |
+
+<a id="receive_control"></a>
+## Receive control
+
+| Address | Access | Name              | Description                           |
+|---------|--------|-------------------|---------------------------------------|
+| 4808050 | R/W    | `W_RXBUF_BEGIN`   |
+| 4808052 | R/W    | `W_RXBUF_END`     |
+| 4808054 | R      | `W_RXBUF_WRCSR`   |
+| 4808056 | R/W    | `W_RXBUF_WR_ADDR` |
+| 4808058 | R/W    | `W_RXBUF_RD_ADDR` |
+| 480805A | R/W    | `W_RXBUF_READCSR` |
+| 480805C | R/W    | `W_RXBUF_COUNT`   |
+| 4808060 | R      | `W_RXBUF_RD_DATA` |
+| 4808062 | R/W    | `W_RXBUF_GAP`     |
+| 4808064 | R/W    | `W_RXBUF_GAPDISP` |
+
+<a id="transmit_control"></a>
+## Transmit control
+
+| Address | Access | Name              | Description                           |
+|---------|--------|-------------------|---------------------------------------|
+| 4808068 | R/W    | `W_TXBUF_WR_ADDR` |
+| 480806C | R/W    | `W_TXBUF_COUNT`   |
+| 4808070 | W      | `W_TXBUF_WR_DATA` |
+| 4808074 | R/W    | `W_TXBUF_GAP`     |
+| 4808076 | R/W    | `W_TXBUF_GAPDISP` |
+| 4808078 | W      | `W_INTERNAL`      |
+| 4808080 | R/W    | `W_TXBUF_BEACON`  | Beacon transmit location
+| 4808084 | R/W    | `W_TXBUF_TIM`     | Beacon TIM index in frame body
+| 4808088 | R/W    | `W_LISTENCOUNT`   | Listen count
+| 480808C | R/W    | `W_BEACONINT`     | Beacon interval
+| 480808E | R/W    | `W_LISTENINT`     | Listen interval
+| 4808090 | R/W    | `W_TXBUF_CMD`     | Multiplay command
+| 4808094 | R/W    | `W_TXBUF_REPLY1`  | Multiplay next reply
+| 4808098 | R      | `W_TXBUF_REPLY2`  | Multiplay current reply
+| 480809C | R/W    | `W_INTERNAL`      |
+| 48080A0 | R/W    | `W_TXBUF_LOC1`    |
+| 48080A4 | R/W    | `W_TXBUF_LOC2`    |
+| 48080A8 | R/W    | `W_TXBUF_LOC3`    |
+| 48080AC | W      | `W_TXREQ_RESET`   |
+| 48080AE | W      | `W_TXREQ_SET`     |
+| 48080B0 | R      | `W_TXREQ_READ`    |
+| 48080B4 | W      | `W_TXBUF_RESET`   |
+| 48080B6 | R      | `W_TXBUSY`        |
+| 48080B8 | R      | `W_TXSTAT`        |
+| 48080BA | ?      | `W_INTERNAL`      |
+| 48080BC | R/W    | `W_PREAMBLE`      |
+| 48080C0 | R/W    | `W_CMD_TOTALTIME` |
+| 48080C4 | R/W    | `W_CMD_REPLYTIME` |
+| 48080C8 | ?      | `W_INTERNAL`      |
+| 48080D0 | R/W    | `W_RXFILTER`      |
+| 48080D4 | R/W    | `W_CONFIG_0D4`    |
+| 48080D8 | R/W    | `W_CONFIG_0D8`    |
+| 48080DA | R/W    | `W_RX_LEN_CROP`   |
+| 48080E0 | R/W    | `W_RXFILTER2`     |
+
+<a id="wifi_timers"></a>
+## WiFi timers
+
+| Address | Access | Name              | Description                           |
+|---------|--------|-------------------|---------------------------------------|
+| 48080E8 | R/W    | `W_US_COUNTCNT`   | Microsecond counter enable
+| 48080EA | R/W    | `W_US_COMPARECNT` | Microsecond compare enable
+| 48080EC | R/W    | `W_CONFIG_0EC`    |
+| 48080EE | R/W    | `W_CMD_COUNTCNT`  |
+| 48080F0 | R/W    | `W_US_COMPARE0`   | Microsecond compare value
+| 48080F2 | R/W    | `W_US_COMPARE1`   | Microsecond compare value
+| 48080F4 | R/W    | `W_US_COMPARE2`   | Microsecond compare value
+| 48080F6 | R/W    | `W_US_COMPARE3`   | Microsecond compare value
+| 48080F8 | R/W    | `W_US_COUNT0`     | Microsecond counter
+| 48080FA | R/W    | `W_US_COUNT1`     | Microsecond counter
+| 48080FC | R/W    | `W_US_COUNT2`     | Microsecond counter
+| 48080FE | R/W    | `W_US_COUNT3`     | Microsecond counter
+| 4808100 | ?      | `W_INTERNAL`      |
+| 4808102 | ?      | `W_INTERNAL`      |
+| 4808104 | ?      | `W_INTERNAL`      |
+| 4808106 | ?      | `W_INTERNAL`      |
+| 480810C | R/W    | `W_CONTENTFREE`   |
+| 4808110 | R/W    | `W_PRE_BEACON`    |
+| 4808118 | R/W    | `W_CMD_COUNT`     |
+| 480811C | R/W    | `W_BEACON_COUNT`  |
+
+<a id="configuration_ports"></a>
+## Configuration ports
+
+| Address | Access | Name            | Description                             |
+|---------|--------|-----------------|-----------------------------------------|
+| 4808120 | R/W    | `W_CONFIG_120`  |
+| 4808122 | R/W    | `W_CONFIG_122`  |
+| 4808124 | R/W    | `W_CONFIG_124`  |
+| 4808126 | ?      | `W_INTERNAL`    |
+| 4808128 | R/W    | `W_CONFIG_128`  |
+| 480812A | ?      | `W_INTERNAL`    |
+| 4808130 | R/W    | `W_CONFIG_130`  |
+| 4808132 | R/W    | `W_CONFIG_132`  |
+| 4808134 | R/W    | `W_POST_BEACON` |
+| 4808140 | R/W    | `W_CONFIG_140`  |
+| 4808142 | R/W    | `W_CONFIG_142`  |
+| 4808144 | R/W    | `W_CONFIG_144`  |
+| 4808146 | R/W    | `W_CONFIG_146`  |
+| 4808148 | R/W    | `W_CONFIG_148`  |
+| 480814A | R/W    | `W_CONFIG_14A`  |
+| 480814C | R/W    | `W_CONFIG_14C`  |
+| 4808150 | R/W    | `W_CONFIG_150`  |
+| 4808154 | R/W    | `W_CONFIG_154`  |
+
+<a id="baseband_chip"></a>
+## Baseband chip
+
+| Address | Access | Name            | Description                             |
+|---------|--------|-----------------|-----------------------------------------|
+| 4808158 | W      | `W_BB_CNT`      | BB access control
+| 480815A | W      | `W_BB_WRITE`    | Byte to write to BB
+| 480815C | R      | `W_BB_READ`     | Byte read from BB
+| 480815E | R      | `W_BB_BUSY`     | BB access busy Flag
+| 4808160 | R/W    | `W_BB_MODE`     | BB access mode
+| 4808168 | R/W    | `W_BB_POWER`    | BB access powerdown
+
+<a id="internal_registers"></a>
+## Internal registers
+
+| Address | Access | Name            | Description                             |
+|---------|--------|-----------------|-----------------------------------------|
+| 480816A | ?      | `W_INTERNAL`    |
+| 4808170 | ?      | `W_INTERNAL`    |
+| 4808172 | ?      | `W_INTERNAL`    |
+| 4808174 | ?      | `W_INTERNAL`    |
+| 4808176 | ?      | `W_INTERNAL`    |
+| 4808178 | W      | `W_INTERNAL`    |
+
+<a id="rf_chip"></a>
+## RF chip
+
+| Address | Access | Name            | Description                             |
+|---------|--------|-----------------|-----------------------------------------|
+| 480817C | R/W    | `W_RF_DATA2`    |
+| 480817E | R/W    | `W_RF_DATA1`    |
+| 4808180 | R      | `W_RF_BUSY`     |
+| 4808184 | R/W    | `W_RF_CNT`      |
+| 4808190 | R/W    | `W_INTERNAL`    |
+| 4808194 | R/W    | `W_TX_HDR_CNT`  |
+| 4808198 | R/W    | `W_INTERNAL`    |
+| 480819C | R      | `W_RF_PINS`     |
+| 48081A0 | R/W    | `W_X_1A0`       |
+| 48081A2 | R/W    | `W_X_1A2`       |
+| 48081A4 | R/W    | `W_X_1A4`       |
+
+<a id="wifi_statistics"></a>
+## WiFi statistics
+
+| Address | Access | Name              | Description                           |
+|---------|--------|-------------------|---------------------------------------|
+| 48081A8 | R      | `W_RXSTAT_INC_IF` | Stats increment flags
+| 48081AA | R/W    | `W_RXSTAT_INC_IE` | Stats increment IRQ enable
+| 48081AC | R      | `W_RXSTAT_OVF_IF` | Stats half-overflow flags
+| 48081AE | R/W    | `W_RXSTAT_OVF_IE` | Stats half-overflow IRQ enable
+| 48081B0 | R/W    | `W_RXSTAT`        |
+| 48081B2 | R/W    | `W_RXSTAT`        |
+| 48081B4 | R/W    | `W_RXSTAT`        |
+| 48081B6 | R/W    | `W_RXSTAT`        |
+| 48081B8 | R/W    | `W_RXSTAT`        |
+| 48081BA | R/W    | `W_RXSTAT`        |
+| 48081BC | R/W    | `W_RXSTAT`        |
+| 48081BE | R/W    | `W_RXSTAT`        |
+| 48081C0 | R/W    | `W_TX_ERR_COUNT`  | TX error count
+| 48081C4 | R      | `W_RX_COUNT`      |
+| 48081D0 | R/W    | `W_CMD_STAT`      |
+| 48081D2 | R/W    | `W_CMD_STAT`      |
+| 48081D4 | R/W    | `W_CMD_STAT`      |
+| 48081D6 | R/W    | `W_CMD_STAT`      |
+| 48081D8 | R/W    | `W_CMD_STAT`      |
+| 48081DA | R/W    | `W_CMD_STAT`      |
+| 48081DC | R/W    | `W_CMD_STAT`      |
+| 48081DE | R/W    | `W_CMD_STAT`      |
+
+<a id="internal_diagnostics"></a>
+## Internal diagnostics
+
+| Address | Access | Name            | Description                             |
+|---------|--------|-----------------|-----------------------------------------|
+| 48081F0 | R/W    | `W_INTERNAL`    |
+| 4808204 | ?      | `W_INTERNAL`    |
+| 4808208 | ?      | `W_INTERNAL`    |
+| 480820C | W      | `W_INTERNAL`    |
+| 4808210 | R      | `W_TX_SEQNO`    |
+| 4808214 | R      | `W_RF_STATUS`   |
+| 480821C | W      | `W_IF_SET`      | Set bits in `W_IF` to force interrupts.
+| 4808220 | R/W    | `W_RAM_DISABLE` | WiFi RAM control
+| 4808224 | R/W    | `W_INTERNAL`    |
+| 4808228 | W      | `W_X_228`       |
+| 4808230 | R/W    | `W_INTERNAL`    |
+| 4808234 | R/W    | `W_INTERNAL`    |
+| 4808238 | R/W    | `W_INTERNAL`    |
+| 480823C | ?      | `W_INTERNAL`    |
+| 4808244 | R/W    | `W_X_244`       |
+| 4808248 | R/W    | `W_INTERNAL`    |
+| 480824C | R      | `W_INTERNAL`    |
+| 480824E | R      | `W_INTERNAL`    |
+| 4808250 | R      | `W_INTERNAL`    |
+| 4808254 | ?      | `W_CONFIG_254`  |
+| 4808258 | ?      | `W_INTERNAL`    |
+| 480825C | ?      | `W_INTERNAL`    |
+| 4808260 | ?      | `W_INTERNAL`    |
+| 4808264 | R      | `W_INTERNAL`    |
+| 4808268 | R      | `W_RXTX_ADDR`   |
+| 4808270 | R      | `W_INTERNAL`    |
+| 4808274 | ?      | `W_INTERNAL`    |
+| 4808278 | R/W    | `W_INTERNAL`    |
+| 480827C | ?      | `W_INTERNAL`    |
+| 4808290 | (R/W)  | `W_X_290`       |
+| 4808298 | W      | `W_INTERNAL`    |
+| 48082A0 | R/W    | `W_INTERNAL`    |
+| 48082A2 | R      | `W_INTERNAL`    |
+| 48082A4 | R      | `W_INTERNAL`    |
+| 48082A8 | W      | `W_INTERNAL`    |
+| 48082AC | ?      | `W_INTERNAL`    |
+| 48082B0 | W      | `W_INTERNAL`    |
+| 48082B4 | R/W    | `W_INTERNAL`    |
+| 48082B8 | ?      | `W_INTERNAL`    |
+| 48082C0 | R/W    | `W_INTERNAL`    |
+| 48082C4 | R      | `W_INTERNAL`    |
+| 48082C8 | R      | `W_INTERNAL`    |
+| 48082CC | R      | `W_INTERNAL`    |
+| 48082D0 | ?      | `W_INTERNAL`    |
+| 48082F0 | R/W    | `W_INTERNAL`    |
+| 48082F2 | R/W    | `W_INTERNAL`    |
+| 48082F4 | R/W    | `W_INTERNAL`    |
+| 48082F6 | R/W    | `W_INTERNAL`    |