Palette Value (9 bit colour) Register - Revision history

Xalior: Xalior moved page Enhanced ULA Palette Extension to Palette Value (9 bit colour) Register: match formal nextreg.txt name (also, old name wildly inaccurate)

2025-10-14T11:08:08Z

Xalior moved page Enhanced ULA Palette Extension to Palette Value (9 bit colour) Register: match formal nextreg.txt name (also, old name wildly inaccurate)

← Older revision		Revision as of 12:08, 14 October 2025
(No difference)

Sol HSA: updated to 78a6ee50

2024-11-03T11:38:38Z

updated to 78a6ee50

← Older revision		Revision as of 12:38, 3 November 2024
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	The read will always read the second byte of colour (%p000000B) and it will not modify the index.		The read will always read the second byte of colour (%p000000B) and it will not modify the index.

			Writes to nextreg 0x40, 0x41, 0x43 reset to the 1st write.

	The modified palette remains until a Hard Reset.		The modified palette remains until a Hard Reset.

Daz: "Enhanced ULA"

2019-04-26T15:15:31Z

"Enhanced ULA"

← Older revision		Revision as of 16:15, 26 April 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Use to set 9-bit (2-byte) colours of the ~~ULANext~~ palette, or to read second byte of colour.		\|ShortDesc=Use to set 9-bit (2-byte) colours of the Enhanced ULA palette, or to read second byte of colour.
	}}		}}
	Two consecutive writes are needed to write the 9 bit colour:		Two consecutive writes are needed to write the 9 bit colour:

Mikecad: Mikecad moved page ULANext Palette Extension to Enhanced ULA Palette Extension without leaving a redirect: ULANext deprecated

2019-04-20T12:46:04Z

Mikecad moved page ULANext Palette Extension to Enhanced ULA Palette Extension without leaving a redirect: ULANext deprecated

← Older revision		Revision as of 13:46, 20 April 2019
(No difference)

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

2019-01-31T19:04:05Z

Core 2.00.26 changes

← Older revision		Revision as of 20:04, 31 January 2019
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	(to detect whether first or second write is expected, one can read bit 7 of {{NextRegNo\|$03}}, in case your code is not aware of current state)		(to detect whether first or second write is expected, one can read bit 7 of {{NextRegNo\|$03}}, in case your code is not aware of current state)

	If writing the Layer 2 palette colour, in the second byte, bit 7 is "priority" bit. Priority colour will be always on top (drawn above ~~Sprites~~), even on an "~~SLU~~" ~~priority arrangement~~. If you need the exact same colour with priority and non priority, you will need to program the same colour twice changing bit 7 to 0 for the non priority colour ~~variant~~.		If writing the Layer 2 palette colour, in the second byte, bit 7 is "priority" bit. Priority colour will be always on top (drawn above all other layers), even on a priority arrangement like "USL" . If you need the exact same colour with priority and non priority, you will need to program the same colour twice, changing bit 7 to 0 for the non priority colour alternative.

	After the write of second byte, the palette index is auto-incremented, if the auto-increment is enabled by {{NextRegNo\|$43}}.		After the write of second byte, the palette index is auto-incremented, if the auto-increment is enabled by {{NextRegNo\|$43}}.

wiki>Ped7g: Fixing read/write vs index auto increment description, thanks to Garry help on Facebook to identify the mistake

2019-01-06T23:42:07Z

Fixing read/write vs index auto increment description, thanks to Garry help on Facebook to identify the mistake

← Older revision		Revision as of 00:42, 7 January 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Use to set~~/read~~ 9-bit (2-byte) colours of the ULANext palette.		\|ShortDesc=Use to set 9-bit (2-byte) colours of the ULANext palette, or to read second byte of colour.
	}}		}}
	Two consecutive ~~reads/~~writes are needed to ~~read/~~write the 9 bit colour:		Two consecutive writes are needed to write the 9 bit colour:
	* 1st ~~read/~~write: bits 7-0 = RRRGGGBB		* 1st write: bits 7-0 = RRRGGGBB
	* 2nd ~~read/~~write: bits 7-1 are reserved, must be 0 (except bit 7 for Layer 2), bit 0 = lsb B		* 2nd write: bits 7-1 are reserved, must be 0 (except bit 7 for Layer 2), bit 0 = lsb B

			(to detect whether first or second write is expected, one can read bit 7 of {{NextRegNo\|$03}}, in case your code is not aware of current state)

	If writing the Layer 2 palette colour, in the second byte, bit 7 is "priority" bit. Priority colour will be always on top (drawn above Sprites), even on an "SLU" priority arrangement. If you need the exact same colour with priority and non priority, you will need to program the same colour twice changing bit 7 to 0 for the non priority colour variant.		If writing the Layer 2 palette colour, in the second byte, bit 7 is "priority" bit. Priority colour will be always on top (drawn above Sprites), even on an "SLU" priority arrangement. If you need the exact same colour with priority and non priority, you will need to program the same colour twice changing bit 7 to 0 for the non priority colour variant.

	After the ~~two consecutive writes~~ the palette index is auto-incremented if the auto-increment is enabled by {{NextRegNo\|$43}}.		After the write of second byte, the palette index is auto-incremented, if the auto-increment is enabled by {{NextRegNo\|$43}}.

			The read will always read the second byte of colour (%p000000B) and it will not modify the index.

	The modified palette remains until a Hard Reset.		The modified palette remains until a Hard Reset.

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

2018-12-22T22:05:07Z

Rewording a bit and adding info from web docs.

← Older revision		Revision as of 23:05, 22 December 2018
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	{{NextRegister		{{NextRegister
	\|Number=$44		\|Number=$44
	\|Readable=No		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=~~Used~~ to ~~send~~ 9-bit (2-byte) ~~color values to~~ the ULANext ~~Palette~~.		\|ShortDesc=Use to set/read 9-bit (2-byte) colours of the ULANext palette.
	}}		}}
			Two consecutive reads/writes are needed to read/write the 9 bit colour:
			* 1st read/write: bits 7-0 = RRRGGGBB
			* 2nd read/write: bits 7-1 are reserved, must be 0 (except bit 7 for Layer 2), bit 0 = lsb B

			If writing the Layer 2 palette colour, in the second byte, bit 7 is "priority" bit. Priority colour will be always on top (drawn above Sprites), even on an "SLU" priority arrangement. If you need the exact same colour with priority and non priority, you will need to program the same colour twice changing bit 7 to 0 for the non priority colour variant.

			After the two consecutive writes the palette index is auto-incremented if the auto-increment is enabled by {{NextRegNo\|$43}}.

			The modified palette remains until a Hard Reset.

wiki>Hyphz at 18:55, 27 December 2017

2017-12-27T18:55:22Z

← Older revision		Revision as of 19:55, 27 December 2017
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	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=~~Holds the additional blue color~~ bit ~~for RGB333~~ color ~~selection~~.		\|ShortDesc=Used to send 9-bit (2-byte) color values to the ULANext Palette.
	}}		}}

wiki>Hyphz at 21:41, 30 August 2017

2017-08-30T21:41:23Z

← Older revision		Revision as of 22:41, 30 August 2017
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	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Holds the additional blue color bit for ~~512~~ color ~~palettes~~.		\|ShortDesc=Holds the additional blue color bit for RGB333 color selection.
	}}		}}