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	Number	Readable	Writable	Description
Pi Peripheral Enable Register	$A0	true	true	Enable Pi peripherals: UART, Pi hats, I2C, SPI
Pi I2S Audio Control Register	$A2	true	true	Pi I2S controls
Pi I2S Clock Divide Register	$A3	true	true	~~Pi I2S clock divide in master mode.~~
ESP WiFi GPIO Output Register	$A8	true	true	ESP WiFi GPIO Output
ESP WiFi GPIO Register	$A9	true	true	ESP WiFi GPIO Read/Write
Extended Keys 0 Register	$B0	true	false	Read Next keyboard compound keys separately
Extended Keys 1 Register	$B1	true	false	Read Next keyboard compound keys separately
DivMMC Trap Enable 1 Register	$B2	true	true	~~DivMMC trap configuration~~
DivMMC Trap Enable 2 Register	$B4	true	true	~~DivMMC trap configuration~~
Debug LED Control Register	$FF	false	true	Turns debug LEDs on and off on TBBlue implementations that have them.