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This page provides a simple browsing interface for finding entities described by a property and a named value. Other available search interfaces include the page property search, and the ask query builder.

List of results

• Active Video Line MSB Register  + (Holds the MSB (only, as bit 0) of the raster line currently being drawn.)
• Video Line Interrupt Value Register  + (Holds the eight LSBs of the line on which a raster interrupt should occur.)
• Active Video Line LSB Register  + (Holds the eight LSBs of the raster line currently being drawn.)
• Machine ID Register  + (Identifies [[TBBlue]] board type. Should always be 10 (binary 0000 1010) on Next.)
• Core Version Register (sub minor)  + (Identifies core (FPGA image) version (sub minor number).)
• Core Version Register  + (Identifies core (FPGA image) version.)
• Machine Type Register  + (Identifies timing and machine type.)
• Next Reset Register  + (Identifies type of last reset. Can be written to force reset.)
• Config Mapping Register  + (In config mode, allows RAM to be mapped to ROM area.)
• Tilemap Transparency Index Register  + (Index into Tilemap palette (of "transparent" colour).)
• Sprites Transparency Index Register  + (Index into sprite palette (of "transparent" colour).)
• Interrupt Enable 0  + (Interrupt type enable control)
• DMA interrupt enable 0  + (Interrupts that can override DMA)
• XDEV command  + (Issue 4 only)
• XADC register  + (Issue 4 only)
• XADC D0  + (Issue 4 only)
• XADC D1  + (Issue 4 only)
• Joystick I/O Mode  + (Joystick port I/O control)
• Kempston Joystick 2, Joystick I/O  + (Kempston interface second joystick variant and controls joystick I/O.)
• NMI Return Address LSB  + (LSB of NMI return address)
• Layer 2 Control Register  + (Layer 2 resolution, palette offset)
• Display Control 1 Register  + (Layer2, ULA shadow, Timex $FF port)
• LoRes Control Register  + (LoRes Radastan mode)
• Keymap Low Data Register  + (Low eight LSBs of PS/2 Keymap data.)
• NMI Return Address MSB  + (MSB of NMI return address)

• Expansion Bus I/O Propagate Register  + (Monitoring internal I/O or adding external keyboard)

• Peripheral 5 Register  + (Multiface type, Divmmc automap, Mouse buttons and DPI config)
• Sprite port-mirror Attribute 4 Register  + (Nextreg port-mirror to write directly into "byte 5" of [[:Sprite Attribute Upload|Sprite Attribute Upload]] ($xx57 / 87).)
• Sprite port-mirror Attribute 1 Register  + (Nextreg port-mirror to write directly into "byte 2" of [[:Sprite Attribute Upload|Sprite Attribute Upload]] ($xx57 / 87).)
• Sprite port-mirror Attribute 0 Register  + (Nextreg port-mirror to write directly into "byte 1" of [[:Sprite Attribute Upload|Sprite Attribute Upload]] ($xx57 / 87).)
• Sprite port-mirror Attribute 2 Register  + (Nextreg port-mirror to write directly into "byte 3" of [[:Sprite Attribute Upload|Sprite Attribute Upload]] ($xx57 / 87).)
• Sprite port-mirror Attribute 3 Register  + (Nextreg port-mirror to write directly into "byte 4" of [[:Sprite Attribute Upload|Sprite Attribute Upload]] ($xx57 / 87).)
• Vertical Video Line Offset Register  + (Offset numbering of raster lines in copper/interrupt/active register)
• SpecDrum DAC Output  + (Output to SpecDrum DAC.)
• Keymap Low Address Register  + (PS/2 Keymap address LSB.)
• Keymap High Address Register  + (PS/2 Keymap address MSB, read (pending) first byte of palette colour)
• Pentagon 1024 paging  + (Paging in Pentagon 1024K mode)
• Pi I2S Audio Control Register  + (Pi I2S controls)
• LoRes X Offset Register  + (Pixel X offset (0..255) to use when drawing LoRes Layer.)
• ULA X Offset Register  + (Pixel X offset (0..255) to use when drawing ULA Layer.)
• LoRes Y Offset Register  + (Pixel Y offset (0..191) to use when drawing LoRes Layer.)
• ULA Y Offset Register  + (Pixel Y offset (0..191) to use when drawing ULA Layer.)
• Next Memory Bank Select  + (Provides additional bank select bits for extended memory.)
• Extended Keys 0 Register  + (Read Next keyboard compound keys separately)
• Extended Keys 1 Register  + (Read Next keyboard compound keys separately)
• Extended MD Pad Buttons  + (Reading additional buttons on MD pads)
• TBBlue Register Access  + (Reads and/or writes the selected TBBlue control register.)
• Kempston Mouse Buttons  + (Reads buttons on Kempston Mouse.)
• UART RX  + (Reads data from serial port, write sets the baudrate)
• Kempston Joystick  + (Reads movement of joysticks using Kempston interface.)
• Sprite port-mirror Attribute 0 (with INC) Register  + (Same as [[:Sprite port-mirror Attribute 0 Register|Sprite port-mirror Attribute 0 Register]] ($35) (write first byte of sprite-attributes), plus increments [[:Sprite port-mirror Index Register|Sprite port-mirror Index Register]] ($34))