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edits
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before I forget about these *again*
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For compatibility purposes, the Wii U implements the External Interface similarly to the GameCube and the Wii.
For compatibility purposes, the Wii U implements the External Interface similarly to the GameCube and the Wii.
On a regular retail Wii U, the [[Hardware/RTC|RTC]] is the only device registered on the EXI bus (channel 0, device 1). An additional device called [[Hardware/NESCAFE|NESCAFE]] (part of the debug [[Hardware/CORTADO|CORTADO]] package) was presumably used in the past for debugging purposes and used to sit on channel 0 as device 2.
On a regular retail Wii U, the [[Hardware/RTC|RTC]] is the only device registered on the EXI bus (channel 0, device 1). An additional device called [[Hardware/NESCAFE|NESCAFE]] (part of the debug [[Hardware/CORTADO|CORTADO]] package) was presumably used in the past for debugging purposes and used to sit on channel 0 as device 2.
+
+This bus is accessible externally via the following test points:
+* TP101 - CLK
+* TP176 - MISO (Device out, Wii U in)
+* Test point between TP100 and TP176 - MOSI (Device in, Wii U out)
== Register List ==
== Register List ==