ULA Palette Control Register - Revision history

Ped7g: Add reference to Tilemap control reg for tilemap palette select.

2025-12-11T08:38:02Z

Add reference to Tilemap control reg for tilemap palette select.

← Older revision		Revision as of 09:38, 11 December 2025
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	Write will also reset the index of {{NextRegNo\|$44}}, so the next write there will be considered as first byte of colour.		Write will also reset the index of {{NextRegNo\|$44}}, so the next write there will be considered as first byte of colour.

			To select Tilemap active palette use {{NextRegNo\|$6B}}.

Xalior: Xalior moved page Enhanced ULA Control Register to ULA Palette Control Register: match formal nextreg.txt name

2025-10-14T11:03:25Z

Xalior moved page Enhanced ULA Control Register to ULA Palette Control Register: match formal nextreg.txt name

← Older revision		Revision as of 12:03, 14 October 2025
(No difference)

Howprice: Clarified the difference between bits 6:4 and 3:1.

2020-12-31T19:13:22Z

Clarified the difference between bits 6:4 and 3:1.

← Older revision		Revision as of 20:13, 31 December 2020
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	\| 0 \|\| Enable ULANext mode if 1. (0 after a reset)		\| 0 \|\| Enable ULANext mode if 1. (0 after a reset)
	\|}		\|}

			n.b. Bits 6-4 select palette for reading or writing whereas bits 3-1 select the palette for the display signal generator.

	Possible bits 6-4 for palette select (bit 6 selects first/second, 5-4 select type):		Possible bits 6-4 for palette select (bit 6 selects first/second, 5-4 select type):

Ped7g at 23:04, 4 January 2020

2020-01-04T23:04:31Z

← Older revision		Revision as of 00:04, 5 January 2020
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	\| 1 \|\| Select ULA palette (0 = first palette, 1 = second palette)		\| 1 \|\| Select ULA palette (0 = first palette, 1 = second palette)
	\|-		\|-
	\| 0 \|\| ~~Enabe~~ ULANext mode if 1. (0 after a reset)		\| 0 \|\| Enable ULANext mode if 1. (0 after a reset)
	\|}		\|}

Ped7g: core 3.0 changes/refresh

2019-11-11T16:12:00Z

core 3.0 changes/refresh

← Older revision		Revision as of 17:12, 11 November 2019
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	\| %111 \|\| Tilemap second palette		\| %111 \|\| Tilemap second palette
	\|}		\|}

			Write will also reset the index of {{NextRegNo\|$44}}, so the next write there will be considered as first byte of colour.

Mikecad: Mikecad moved page ULANext Control Register to Enhanced ULA Control Register without leaving a redirect: ULANext is deprecated

2019-04-20T12:30:09Z

Mikecad moved page ULANext Control Register to Enhanced ULA Control Register without leaving a redirect: ULANext is deprecated

← Older revision		Revision as of 13:30, 20 April 2019
(No difference)

Mikecad at 12:12, 20 April 2019

2019-04-20T12:12:34Z

← Older revision		Revision as of 13:12, 20 April 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Enables or disables ~~ULANext~~ interpretation of attribute values and toggles active palette.		\|ShortDesc=Enables or disables Enhanced ULA interpretation of attribute values and toggles active palette.
	}}		}}
	{\| class="wikitable"		{\| class="wikitable"

Specnext: 6 revisions imported

2019-04-14T10:00:23Z

6 revisions imported

← Older revision		Revision as of 11:00, 14 April 2019
(No difference)

wiki>Ped7g: Core 2.00.26 changes

2019-01-31T19:01:15Z

Core 2.00.26 changes

← Older revision		Revision as of 20:01, 31 January 2019
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	\| 1 \|\| Select ULA palette (0 = first palette, 1 = second palette)		\| 1 \|\| Select ULA palette (0 = first palette, 1 = second palette)
	\|-		\|-
	\| 0 \|\| ~~Disable the standard Spectrum flash feature to enable the extra colours~~. (0 after a reset)		\| 0 \|\| Enabe ULANext mode if 1. (0 after a reset)
	\|}		\|}

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	\|-		\|-
	\| %110 \|\| Sprites second palette		\| %110 \|\| Sprites second palette
			\|-
			\| %011 \|\| Tilemap first palette
			\|-
			\| %111 \|\| Tilemap second palette
	\|}		\|}

wiki>Ped7g: Rewording a bit and adding info from web docs.

2018-12-22T21:48:57Z

Rewording a bit and adding info from web docs.

← Older revision		Revision as of 22:48, 22 December 2018
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	{{NextRegister		{{NextRegister
	\|Number=$43		\|Number=$43
	\|Readable=No		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Enables or disables ULANext interpretation of attribute values and toggles active palette.		\|ShortDesc=Enables or disables ULANext interpretation of attribute values and toggles active palette.
	}}		}}

	{\| class="wikitable"		{\| class="wikitable"
	! Bit !! Function		! Bit !! Function
	\|-		\|-
	\| 7 \|\| ~~Reserved~~		\| 7 \|\| 1 to disable palette index write auto-increment
			\|-
			\| 6-4 \|\| Select palette for reading or writing
			\|-
			\| 3 \|\| Select Sprites palette (0 = first palette, 1 = second palette)
			\|-
			\| 2 \|\| Select Layer 2 palette (0 = first palette, 1 = second palette)
			\|-
			\| 1 \|\| Select ULA palette (0 = first palette, 1 = second palette)
			\|-
			\| 0 \|\| Disable the standard Spectrum flash feature to enable the extra colours. (0 after a reset)
			\|}

			Possible bits 6-4 for palette select (bit 6 selects first/second, 5-4 select type):
			{\| class="wikitable"
			! Bits 6-4 !! selects
	\|-		\|-
	\| 6 \|\| ~~Select normal (0) or second (1)~~ palette ~~to read/write~~		\| %000 \|\| ULA first palette
	\|-		\|-
	\| ~~4-5~~ \|\| ~~Select~~ ULA ~~(00), Layer 2 (01) or sprite (10)~~ palette ~~to read/write~~		\| %100 \|\| ULA second palette
	\|-		\|-
	\| 3 \|\| ~~Enable second~~ palette ~~on Sprites~~		\| %001 \|\| Layer 2 first palette
	\|-		\|-
	\| 2 \|\| ~~Enable~~ second palette ~~on Layer 2~~		\| %101 \|\| Layer 2 second palette
	\|-		\|-
	\| 1 \|\| ~~Enable second~~ palette ~~on ULANext~~		\| %010 \|\| Sprites first palette
	\|-		\|-
	\| 0 \|\| ~~Enable ULANext attributes~~		\| %110 \|\| Sprites second palette
	\|}		\|}