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 NumberReadableWritableDescription
Debug LED Control Register$FFfalsetrueTurns debug LEDs on and off on TBBlue implementations that have them.
Default Tilemap Attribute Register$6CtruetrueDefault tile attribute for 8-bit only maps.
Display Control 1 Register$69truetrueLayer2, ULA shadow, Timex $FF port
DivMMC Trap Enable 1 Register$B2truetrueDivMMC trap configuration
DivMMC Trap Enable 2 Register$B4truetrueDivMMC trap configuration
ESP WiFi GPIO Output Register$A8truetrueESP WiFi GPIO Output
ESP WiFi GPIO Register$A9truetrueESP WiFi GPIO Read/Write
Enhanced ULA Control Register$43truetrueEnables or disables Enhanced ULA interpretation of attribute values and toggles active palette.
Enhanced ULA Ink Color Mask$42truetrueSpecifies mask to extract ink colour from attribute cell value in ULANext mode.
Enhanced ULA Palette Extension$44truetrueUse to set 9-bit (2-byte) colours of the Enhanced ULA palette, or to read second byte of colour.
Expansion Bus Control Register$81truetrueExpansion bus controls
Expansion Bus Decoding b0-7 Register$86truetrueWhen expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b16-23 Register$88truetrueWhen expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b24-31 Register$89truetrueWhen expansion bus is enabled: Internal ports decoding mask
Expansion Bus Decoding b8-15 Register$87truetrueWhen expansion bus is enabled: Internal ports decoding mask
Expansion Bus Enable Register$80truetrueExpansion bus enable/config
Expansion Bus I/O Propagate Register$8AtruetrueMonitoring internal I/O or adding external keyboard
Extended Keys 0 Register$B0truefalseRead Next keyboard compound keys separately
Extended Keys 1 Register$B1truefalseRead Next keyboard compound keys separately
Global Transparency Register$14truetrueSets the "transparent" colour for Layer 2, ULA and LoRes pixel data.
Internal Port Decoding b0-7 Register$82truetrueEnabling internal ports decoding
Internal Port Decoding b16-23 Register$84truetrueEnabling internal ports decoding
Internal Port Decoding b24-31 Register$85truetrueEnabling internal ports decoding
Internal Port Decoding b8-15 Register$83truetrueEnabling internal ports decoding
Keymap High Address Register$28truetruePS/2 Keymap address MSB, read (pending) first byte of palette colour
Keymap High Data Register$2AfalsetrueHigh data to PS/2 Keymap (MSB of data in bit 0)
Keymap Low Address Register$29falsetruePS/2 Keymap address LSB.
Keymap Low Data Register$2BfalsetrueLow eight LSBs of PS/2 Keymap data.
Layer 2 Control Register$70truetrueLayer 2 resolution, palette offset
Layer 2 RAM Page Register$12truetrueSets the bank number where Layer 2 video memory begins.
Layer 2 RAM Shadow Page Register$13truetrueSets the bank number where the Layer 2 shadow screen begins.
Layer 2 X Offset MSB Register$71truetrueSets the pixel offset used for drawing Layer 2 graphics on the screen.
Layer 2 X Offset Register$16truetrueSets the pixel offset used for drawing Layer 2 graphics on the screen.
Layer 2 Y Offset Register$17truetrueSets the Y offset used when drawing Layer 2 graphics on the screen.
LoRes Control Register$6AtruetrueLoRes Radastan mode
LoRes X Offset Register$32truetruePixel X offset (0..255) to use when drawing LoRes Layer.
LoRes Y Offset Register$33truetruePixel Y offset (0..191) to use when drawing LoRes Layer.
Machine ID Register$00truefalseIdentifies TBBlue board type. Should always be 10 on Next.
Machine Type Register$03truetrueIdentifies timing and machine type.
Memory Mapping Register$8EtruetrueControl classic Spectrum memory mapping
Memory management slot 0 bank$50truetrueSelects the 8k-bank stored in 8k-slot 0 (see Memory map).
Memory management slot 1 bank$51truetrueSelects the 8k-bank stored in 8k-slot 1 (see Memory map).
Memory management slot 2 bank$52truetrueSelects the 8k-bank stored in 8k-slot 2 (see Memory map).
Memory management slot 3 bank$53truetrueSelects the 8k-bank stored in 8k-slot 3 (see Memory map).
Memory management slot 4 bank$54truetrueSelects the 8k-bank stored in 8k-slot 4 (see Memory map).
Memory management slot 5 bank$55truetrueSelects the 8k-bank stored in 8k-slot 5 (see Memory map).
Memory management slot 6 bank$56truetrueSelects the 8k-bank stored in 8k-slot 6 (see Memory map).
Memory management slot 7 bank$57truetrueSelects the 8k-bank stored in 8k-slot 7 (see Memory map).
Next Reset Register$02truetrueIdentifies type of last reset. Can be written to force reset.
Palette Index Register$40truetrueChooses an palette element (index) to manipulate with
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