Pi GPIO Output Enable Register

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Number $90-$93
Readable Yes
Writable Yes
Short Description Enables GPIO pins output
 Bits 27-0: Set bits enable GPIO output on the corresponding GPIO pin (soft reset = all 0)

GPIO pins 1:0 cannot be enabled.

The register $93 is MSB (most significant byte = bits 31-24), register $90 is LSB (least significant byte = bits 7-0).

Bits 31-28 are not explicitly specified in the docs, so consider them "Reserved, preserve current value".

(note: Next registers with number higher than $7F are inaccessible from Copper code)