Board feature control - Revision history

Johnnyo: /* The list of ports */ update

2026-02-23T16:11:30Z

The list of ports: update

← Older revision		Revision as of 17:11, 23 February 2026
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	* {{PortNo\|$7FFD}} [[Memory Paging Control]]		* {{PortNo\|$7FFD}} [[Memory Paging Control]]
	* {{PortNo\|$BFF5}} [[AY Info]]		* {{PortNo\|$BFF5}} [[AY Info]]
			* {{PortNo\|$BF3B}} ULA+ Register Select
			* {{PortNo\|$FF3B}} ULA+ Data
	* {{PortNo\|$BFFD}} [[Sound Chip Register Write]]		* {{PortNo\|$BFFD}} [[Sound Chip Register Write]]
	* {{PortNo\|$DFFD}} [[Next Memory Bank Select]]		* {{PortNo\|$DFFD}} [[Next Memory Bank Select]]
	* {{PortNo\|$E3}} [[DIVMMC]]		* {{PortNo\|$E3}} [[DIVMMC]]
			* {{PortNo\|$E7}} SPI Data
	* {{PortNo\|$EFF7}} [[Pentagon 1024 paging]]		* {{PortNo\|$EFF7}} [[Pentagon 1024 paging]]
	* {{PortNo\|$FADF}} [[Kempston Mouse Buttons]]		* {{PortNo\|$FADF}} [[Kempston Mouse Buttons]]

Johnnyo: /* Next/TBBlue Feature Control Registers */ remove entry to "not implemented" B4

2026-01-06T07:29:40Z

Next/TBBlue Feature Control Registers: remove entry to "not implemented" B4

← Older revision		Revision as of 08:29, 6 January 2026
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	* [[NextReg:$B2]] [[DivMMC Trap Enable 1 Register]]		* [[NextReg:$B2]] [[DivMMC Trap Enable 1 Register]]
	* [[NextReg:$B2]] [[Extended MD Pad Buttons Register]]		* [[NextReg:$B2]] [[Extended MD Pad Buttons Register]]
	* [[NextReg:$B4]] [[DivMMC Trap Enable 2 Register]]
	* [[NextReg:$B8]] [[Divmmc Entry Points 0]]		* [[NextReg:$B8]] [[Divmmc Entry Points 0]]
	* [[NextReg:$B9]] [[Divmmc Entry Points Valid 0]]		* [[NextReg:$B9]] [[Divmmc Entry Points Valid 0]]

Johnnyo: /* The list of ports */ FE control first

2025-12-30T08:38:15Z

The list of ports: FE control first

← Older revision		Revision as of 09:38, 30 December 2025
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	The following ports are currently documented in this wiki:		The following ports are currently documented in this wiki:
	* {{PortNo\|$xxFE}} [[~~Keyboard~~]] and [[~~ULA Control Port~~]]		* {{PortNo\|$xxFE}} [[ULA Control Port]] and [[Keyboard]]
	* {{PortNo\|$103B}} [[I2C clock]]		* {{PortNo\|$103B}} [[I2C clock]]
	* {{PortNo\|$113B}} [[I2C data]]		* {{PortNo\|$113B}} [[I2C data]]

Johnnyo: /* The list of ports */ link ports NN too

2025-12-30T08:27:09Z

The list of ports: link ports NN too

← Older revision		Revision as of 09:27, 30 December 2025
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	The following ports are currently documented in this wiki:		The following ports are currently documented in this wiki:
			* {{PortNo\|$xxFE}} [[Keyboard]] and [[ULA Control Port]]
	* ~~Port:~~$xxFE [[Keyboard]] and [[ULA Control Port]]		* {{PortNo\|$103B}} [[I2C clock]]
	* ~~Port:~~$103B [[I2C clock]]		* {{PortNo\|$113B}} [[I2C data]]
	* ~~Port:~~$113B [[I2C data]]		* {{PortNo\|$123B}} [[Layer 2 Access Port]]
	* ~~Port:~~$123B [[Layer 2 Access Port]]		* {{PortNo\|$133B}} [[UART TX]]
	* ~~Port:~~$133B [[UART TX]]		* {{PortNo\|$143B}} [[UART RX]]
	* ~~Port:~~$143B [[UART RX]]		* {{PortNo\|$153B}} [[UART Control]]
	* ~~Port:~~$153B [[UART Control]]		* {{PortNo\|$163B}} [[UART Frame]]
	* ~~Port:~~$163B [[UART Frame]]		* {{PortNo\|$183B}} [[CTC Channels]]
	* ~~Port:~~$183B [[CTC Channels]]		* {{PortNo\|$1FFD}} [[Plus 3 Memory Paging Control]]
	* ~~Port:~~$1FFD [[Plus 3 Memory Paging Control]]		* {{PortNo\|$243B}} [[TBBlue Register Select]]
	* ~~Port:~~$243B [[TBBlue Register Select]]		* {{PortNo\|$253B}} [[TBBlue Register Access]]
	* ~~Port:~~$253B [[TBBlue Register Access]]		* {{PortNo\|$303B}} [[Sprite Status/Slot Select]]
	* ~~Port:~~$303B [[Sprite Status/Slot Select]]		* {{PortNo\|$7FFD}} [[Memory Paging Control]]
	* ~~Port:~~$7FFD [[Memory Paging Control]]		* {{PortNo\|$BFF5}} [[AY Info]]
	* ~~Port:~~$BFF5 [[AY Info]]		* {{PortNo\|$BFFD}} [[Sound Chip Register Write]]
	* ~~Port:~~$BFFD [[Sound Chip Register Write]]		* {{PortNo\|$DFFD}} [[Next Memory Bank Select]]
	* ~~Port:~~$DFFD [[Next Memory Bank Select]]		* {{PortNo\|$E3}} [[DIVMMC]]
	* ~~Port:~~$E3 [[DIVMMC]]		* {{PortNo\|$EFF7}} [[Pentagon 1024 paging]]
	* ~~Port:~~$EFF7 [[Pentagon 1024 paging]]		* {{PortNo\|$FADF}} [[Kempston Mouse Buttons]]
	* ~~Port:~~$FADF [[Kempston Mouse Buttons]]		* {{PortNo\|$FBDF}} [[Kempston Mouse X]]
	* ~~Port:~~$FBDF [[Kempston Mouse X]]		* {{PortNo\|$FFDF}} [[Kempston Mouse Y]]
	* ~~Port:~~$FFDF [[Kempston Mouse Y]]		* {{PortNo\|$FFFD}} [[Turbo Sound Next Control]]
	* ~~Port:~~$FFFD [[Turbo Sound Next Control]]		* {{PortNo\|$xx0B}} [[MB02 DMA Port]]
	* ~~Port:~~$xx0B [[MB02 DMA Port]]		* {{PortNo\|$xx1F}} [[Kempston Joystick]]
	* ~~Port:~~$xx1F [[Kempston Joystick]]		* {{PortNo\|$xx37}} [[Kempston Joystick 2, Joystick I/O]]
	* ~~Port:~~$xx37 [[Kempston Joystick 2, Joystick I/O]]		* {{PortNo\|$xx57}} [[Sprite Attribute Upload]]
	* ~~Port:~~$xx57 [[Sprite Attribute Upload]]		* {{PortNo\|$xx5B}} [[Sprite Pattern Upload]]
	* ~~Port:~~$xx5B [[Sprite Pattern Upload]]		* {{PortNo\|$xx6B}} [[Datagear DMA Port]]
	* ~~Port:~~$xx6B [[Datagear DMA Port]]		* {{PortNo\|$xxDF}} [[SpecDrum DAC Output]]
	* ~~Port:~~$xxDF [[SpecDrum DAC Output]]		* {{PortNo\|$xxFE}} [[ULA Control Port]]
	* ~~Port:~~$xxFE [[ULA Control Port]]		* {{PortNo\|$xxFF}} [[Timex Sinclair Video Mode Control]]
	* ~~Port:~~$xxFF [[Timex Sinclair Video Mode Control]]

	= Next/TBBlue Feature Control Registers =		= Next/TBBlue Feature Control Registers =

Johnnyo: /* Next/TBBlue Feature Control Registers */ link from the NextReg:$NN too

2025-12-30T08:23:20Z

Next/TBBlue Feature Control Registers: link from the NextReg:$NN too

Show changes

Johnnyo: /* Next/TBBlue Feature Control Registers */ added Pi GPIO which had '-'

2025-12-30T07:50:38Z

Next/TBBlue Feature Control Registers: added Pi GPIO which had '-'

← Older revision		Revision as of 08:50, 30 December 2025
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	* NextReg:$8E [[Memory Mapping Register]]		* NextReg:$8E [[Memory Mapping Register]]
	* NextReg:$8F [[Memory Mapping Mode Register]]		* NextReg:$8F [[Memory Mapping Mode Register]]
			* NextReg:$90-$93 [[Pi GPIO Output Enable Register]]
			* NextReg:$98-$9B [[Pi GPIO Register]]
	* NextReg:$A0 [[Pi Peripheral Enable Register]]		* NextReg:$A0 [[Pi Peripheral Enable Register]]
	* NextReg:$A2 [[Pi I2S Audio Control Register]]		* NextReg:$A2 [[Pi I2S Audio Control Register]]

Johnnyo: Changing the subtitle to "About The Content of this Page"

2025-12-30T07:38:51Z

Changing the subtitle to "About The Content of this Page"

← Older revision		Revision as of 08:38, 30 December 2025
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	This is a general list of ports and registers used to control features of the Spectrum Next.		This is a general list of ports and registers used to control features of the Spectrum Next.

	== ~~THIS PAGE IS SUBSTANTIALLY BROKEN SINCE WIKI UPGRADED~~ ==		== About The Content of this Page ==

			This page features the list of the Next ports and control registers.

	A partial replacement to some of the content that the old codebase provided has been migrated to https://explorer.specnext.dev/ - this site is still under active development, but aims to be an automated way to explore the contents of official specification & documents.		A partial replacement to some of the content that the old codebase provided has been migrated to https://explorer.specnext.dev/ - this site is still under active development, but aims to be an automated way to explore the contents of official specification & documents.

Johnnyo: /* The list of ports */

2025-12-30T07:35:07Z

The list of ports

← Older revision		Revision as of 08:35, 30 December 2025
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	=== The list of ports ===		=== The list of ports ===

	The following ports are documented		The following ports are currently documented in this wiki:

	* Port:$xxFE [[Keyboard]] and [[ULA Control Port]]		* Port:$xxFE [[Keyboard]] and [[ULA Control Port]]

Johnnyo: /* Mapped Spectrum Ports */ port list

2025-12-30T07:34:32Z

Mapped Spectrum Ports: port list

← Older revision		Revision as of 08:34, 30 December 2025
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	\|}		\|}

	= Mapped ~~Spectrum~~ Ports =		= Mapped Next Ports =

	===A note on partial decoding===		===A note on partial decoding===
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	On the other hand, partial decoding can allow use of the multiple output opcodes such as OTIR, which normally places the loop counter on the top half of the address bus - thus making it useless except for devices which ignore this top half. This is the reason why some of the Next registers do ignore the top half of the port address.		On the other hand, partial decoding can allow use of the multiple output opcodes such as OTIR, which normally places the loop counter on the top half of the address bus - thus making it useless except for devices which ignore this top half. This is the reason why some of the Next registers do ignore the top half of the port address.

	~~{{#ask~~:		=== The list of ports ===
	[[~~Category~~:Port]]
	~~\|?PortNumber=Hexadecimal~~		The following ports are documented
	~~\|?NumberDec#-=Decimal~~
	~~\|?PortMask=Mask~~		* Port:$xxFE [[Keyboard]] and [[ULA Control Port]]
	~~\|?ShortDesc=Description~~		* Port:$103B [[I2C clock]]
	~~\|sort=PortNumber~~		* Port:$113B [[I2C data]]
	}}		* Port:$123B [[Layer 2 Access Port]]
			* Port:$133B [[UART TX]]
			* Port:$143B [[UART RX]]
			* Port:$153B [[UART Control]]
			* Port:$163B [[UART Frame]]
			* Port:$183B [[CTC Channels]]
			* Port:$1FFD [[Plus 3 Memory Paging Control]]
			* Port:$243B [[TBBlue Register Select]]
			* Port:$253B [[TBBlue Register Access]]
			* Port:$303B [[Sprite Status/Slot Select]]
			* Port:$7FFD [[Memory Paging Control]]
			* Port:$BFF5 [[AY Info]]
			* Port:$BFFD [[Sound Chip Register Write]]
			* Port:$DFFD [[Next Memory Bank Select]]
			* Port:$E3 [[DIVMMC]]
			* Port:$EFF7 [[Pentagon 1024 paging]]
			* Port:$FADF [[Kempston Mouse Buttons]]
			* Port:$FBDF [[Kempston Mouse X]]
			* Port:$FFDF [[Kempston Mouse Y]]
			* Port:$FFFD [[Turbo Sound Next Control]]
			* Port:$xx0B [[MB02 DMA Port]]
			* Port:$xx1F [[Kempston Joystick]]
			* Port:$xx37 [[Kempston Joystick 2, Joystick I/O]]
			* Port:$xx57 [[Sprite Attribute Upload]]
			* Port:$xx5B [[Sprite Pattern Upload]]
			* Port:$xx6B [[Datagear DMA Port]]
			* Port:$xxDF [[SpecDrum DAC Output]]
			* Port:$xxFE [[ULA Control Port]]
			* Port:$xxFF [[Timex Sinclair Video Mode Control]]

	= Next/TBBlue Feature Control Registers =		= Next/TBBlue Feature Control Registers =

Johnnyo: /* Next/TBBlue Feature Control Registers */ inserting the whole list

2025-12-29T21:56:44Z

Next/TBBlue Feature Control Registers: inserting the whole list

Show changes

← Older revision		Revision as of 17:11, 23 February 2026
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	* {{PortNo\|$7FFD}} [[Memory Paging Control]]		* {{PortNo\|$7FFD}} [[Memory Paging Control]]
	* {{PortNo\|$BFF5}} [[AY Info]]		* {{PortNo\|$BFF5}} [[AY Info]]
			* {{PortNo\|$BF3B}} ULA+ Register Select
			* {{PortNo\|$FF3B}} ULA+ Data
	* {{PortNo\|$BFFD}} [[Sound Chip Register Write]]		* {{PortNo\|$BFFD}} [[Sound Chip Register Write]]
	* {{PortNo\|$DFFD}} [[Next Memory Bank Select]]		* {{PortNo\|$DFFD}} [[Next Memory Bank Select]]
	* {{PortNo\|$E3}} [[DIVMMC]]		* {{PortNo\|$E3}} [[DIVMMC]]
			* {{PortNo\|$E7}} SPI Data
	* {{PortNo\|$EFF7}} [[Pentagon 1024 paging]]		* {{PortNo\|$EFF7}} [[Pentagon 1024 paging]]
	* {{PortNo\|$FADF}} [[Kempston Mouse Buttons]]		* {{PortNo\|$FADF}} [[Kempston Mouse Buttons]]