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	Number	Readable	Writable	Description
DivMMC Trap Enable 2 Register	$B4	Yes	Yes	~~DivMMC trap configuration~~
ESP WiFi GPIO Output Register	$A8	Yes	Yes	ESP WiFi GPIO Output
ESP WiFi GPIO Register	$A9	Yes	Yes	ESP WiFi GPIO Read/Write
Enhanced ULA Control Register	$43	Yes	Yes	Enables or disables Enhanced ULA interpretation of attribute values and toggles active palette.
Enhanced ULA Ink Color Mask	$42	Yes	Yes	Specifies mask to extract ink colour from attribute cell value in ULANext mode.
Enhanced ULA Palette Extension	$44	Yes	Yes	Use to set 9-bit (2-byte) colours of the Enhanced ULA palette, or to read second byte of colour.
Expansion Bus Control Register	$81	Yes	Yes	Expansion bus controls
Expansion Bus Decoding b0-7 Register	$86	Yes	Yes	When expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b16-23 Register	$88	Yes	Yes	When expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b24-31 Register	$89	Yes	Yes	When expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b8-15 Register	$87	Yes	Yes	When expansion bus is enabled: Internal ports decoding mask
Expansion Bus Enable Register	$80	Yes	Yes	Expansion bus enable/config
Expansion Bus I/O Propagate Register	$8A	Yes	Yes	Monitoring internal I/O or adding external keyboard
Extended Keys 0 Register	$B0	Yes	No	Read Next keyboard compound keys separately
Extended Keys 1 Register	$B1	Yes	No	Read Next keyboard compound keys separately
Global Transparency Register	$14	Yes	Yes	Sets the "transparent" colour for Layer 2, ULA and LoRes pixel data.
Internal Port Decoding b0-7 Register	$82	Yes	Yes	Enabling internal ports decoding
Internal Port Decoding b16-23 Register	$84	Yes	Yes	Enabling internal ports decoding
Internal Port Decoding b24-31 Register	$85	Yes	Yes	Enabling internal ports decoding
Internal Port Decoding b8-15 Register	$83	Yes	Yes	Enabling internal ports decoding
Keymap High Address Register	$28	Yes	Yes	PS/2 Keymap address MSB, read (pending) first byte of palette colour
Keymap High Data Register	$2A	No	Yes	High data to PS/2 Keymap (MSB of data in bit 0)
Keymap Low Address Register	$29	No	Yes	PS/2 Keymap address LSB.
Keymap Low Data Register	$2B	No	Yes	Low eight LSBs of PS/2 Keymap data.
Layer 2 Control Register	$70	Yes	Yes	Layer 2 resolution, palette offset
Layer 2 RAM Page Register	$12	Yes	Yes	Sets the bank number where Layer 2 video memory begins.
Layer 2 RAM Shadow Page Register	$13	Yes	Yes	Sets the bank number where the Layer 2 shadow screen begins.
Layer 2 X Offset MSB Register	$71	Yes	Yes	Sets the pixel offset used for drawing Layer 2 graphics on the screen.
Layer 2 X Offset Register	$16	Yes	Yes	Sets the pixel offset used for drawing Layer 2 graphics on the screen.
Layer 2 Y Offset Register	$17	Yes	Yes	Sets the Y offset used when drawing Layer 2 graphics on the screen.
LoRes Control Register	$6A	Yes	Yes	LoRes Radastan mode
LoRes X Offset Register	$32	Yes	Yes	Pixel X offset (0..255) to use when drawing LoRes Layer.
LoRes Y Offset Register	$33	Yes	Yes	Pixel Y offset (0..191) to use when drawing LoRes Layer.
Machine ID Register	$00	Yes	No	Identifies TBBlue board type. Should always be 10 on Next.
Machine Type Register	$03	Yes	Yes	Identifies timing and machine type.
Memory Mapping Register	$8E	Yes	Yes	Control classic Spectrum memory mapping
Memory management slot 0 bank	$50	Yes	Yes	Selects the 8k-bank stored in 8k-slot 0 (see Memory map).
Memory management slot 1 bank	$51	Yes	Yes	Selects the 8k-bank stored in 8k-slot 1 (see Memory map).
Memory management slot 2 bank	$52	Yes	Yes	Selects the 8k-bank stored in 8k-slot 2 (see Memory map).
Memory management slot 3 bank	$53	Yes	Yes	Selects the 8k-bank stored in 8k-slot 3 (see Memory map).
Memory management slot 4 bank	$54	Yes	Yes	Selects the 8k-bank stored in 8k-slot 4 (see Memory map).
Memory management slot 5 bank	$55	Yes	Yes	Selects the 8k-bank stored in 8k-slot 5 (see Memory map).
Memory management slot 6 bank	$56	Yes	Yes	Selects the 8k-bank stored in 8k-slot 6 (see Memory map).
Memory management slot 7 bank	$57	Yes	Yes	Selects the 8k-bank stored in 8k-slot 7 (see Memory map).
Next Reset Register	$02	Yes	Yes	Identifies type of last reset. Can be written to force reset.
Palette Index Register	$40	Yes	Yes	Chooses an palette element (index) to manipulate with
Palette Value Register	$41	Yes	Yes	Use to set/read 8-bit colours of the ULANext palette.
Peripheral 1 Register	$05	Yes	Yes	Sets joystick mode, video frequency and Scandoubler.
Peripheral 2 Register	$06	Yes	Yes	Enables CPU Speed key, DivMMC, Multiface, Mouse and AY audio.
Peripheral 3 Register	$08	Yes	Yes	ABC/ACB Stereo, Internal Speaker, SpecDrum, Timex Video Modes, Turbo Sound Next, RAM contention and [un]lock 128k paging.