Palette Index Register - Revision history

Ped7g: core 3.0 changes/refresh

2019-11-11T21:38:31Z

core 3.0 changes/refresh

← Older revision		Revision as of 22:38, 11 November 2019
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	In ULANext mode, enabled via {{NextRegNo\|$43}}:		In ULANext mode, enabled via {{NextRegNo\|$43}}:
	:INKs come from a subset of indices 0-127 (except full ink colour mode, when all 0-255 indices are INK colour)		:INKs come from a subset of indices 0-127 (except full-ink colour mode, when all 0-255 indices are INK colour)
	:PAPERs come from a subset of indices 128-255 (in full ink colour mode the ~~only paper~~ is ~~at 128 and BORDERs at 128-135~~)		:PAPERs come from a subset of indices 128-255 (in full-ink colour mode the PAPER and BORDER colour is taken from {{NextRegNo\|$4A}})
	:The number of active indices depends on the number of attribute bits assigned to INK and PAPER out of the attribute byte by {{NextRegNo\|$42}}.		:The number of active indices depends on the number of attribute bits assigned to INK and PAPER out of the attribute byte by {{NextRegNo\|$42}}.

	The ULA always takes border colour from paper.		In ULA+ mode, the top 64 entries hold the ULA+ palette.

			The ULA always takes border colour from paper colours.

	Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to classic/enhanced ULA palette.		Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to classic/enhanced ULA palette.

Ped7g: core 3.0 changes/refresh

2019-11-11T16:11:07Z

core 3.0 changes/refresh

← Older revision		Revision as of 17:11, 11 November 2019
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	\|ShortDesc=Chooses an palette element (index) to manipulate with		\|ShortDesc=Chooses an palette element (index) to manipulate with
	}}		}}
	This associates selected element (0-255) of currently selected (Register $43) palette to be accessible through the {{NextRegNo\|$41}} and {{NextRegNo\|$44}}.		This associates selected element (0-255) of currently selected (Register $43) palette to be accessible through the {{NextRegNo\|$41}} and {{NextRegNo\|$44}}. Write will also reset the index of {{NextRegNo\|$44}}, so the next write there will be considered as first byte of colour.

	For the [classic] ULA only:		For the [classic] ULA only:

Specnext: 6 revisions imported

2019-04-14T10:00:19Z

6 revisions imported

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

wiki>Ped7g: Core 2.00.26 changes

2019-01-31T18:54:51Z

Core 2.00.26 changes

← Older revision		Revision as of 19:54, 31 January 2019
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	\|Readable=Yes		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Chooses an ~~ULANext~~ palette index to ~~configure.~~		\|ShortDesc=Chooses an palette element (index) to manipulate with
	}}		}}
	~~Palette indices 0-127 are INK colours. Entries 0-7 are the standard Spectrum INK colours~~ (~~except full ink colour mode, when all~~ 0-255 ~~indices are INK colour~~).		This associates selected element (0-255) of currently selected (Register $43) palette to be accessible through the {{NextRegNo\|$41}} and {{NextRegNo\|$44}}.

	~~Palette~~ indices ~~128~~-~~255~~ are ~~PAPER colours. Entries 128~~-~~135~~ are ~~the standard Spectrum PAPER colours and BORDER colours (even in "full INK" mode).~~		For the [classic] ULA only:
			:INKs are mapped to indices 0-7
			:Bright INKS are mapped to indices 8-15
			:PAPERs are mapped to indices 16-23
			:Bright PAPERs are mapped to indices 24-31

	~~Higher colours can only be used by enabling~~ ULANext mode via {{NextRegNo\|$43}}. The ~~split~~ of attribute bits ~~between~~ INK and PAPER ~~values is selected~~ by ~~INK-mask set via~~ {{NextRegNo\|$42}}.		In ULANext mode, enabled via {{NextRegNo\|$43}}:
			:INKs come from a subset of indices 0-127 (except full ink colour mode, when all 0-255 indices are INK colour)
			:PAPERs come from a subset of indices 128-255 (in full ink colour mode the only paper is at 128 and BORDERs at 128-135)
			:The number of active indices depends on the number of attribute bits assigned to INK and PAPER out of the attribute byte by {{NextRegNo\|$42}}.

	Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to ~~Enhanced~~ ULA palette.		The ULA always takes border colour from paper.

			Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to classic/enhanced ULA palette.

			The Tilemap palette contains 256 colours, but number of colour selected by particular pixel of tile consists of top 4 bits from tile attribute and bottom 4 bits from the tile pixel, i.e. the Tilemap palette works like 16x16 sub-palettes, with each tile being defined with 0-15 indices only (and one index of them is transparent). Then the attribute of the tile fills up the top four bits, selecting 0-15 "sub-palette".

			4-bit sprites test for transparency only against low 4 bits of Sprite transparency register, and further the pixels are processed similarly to 8-bit sprites, as if the top 4 bits in pattern data were all zeroes. I.e. to the pixel value the palette offset from sprite attributes is added, and final index is used to fetch colour from Sprite palette. Transparency index is compared before the palette offset is applied.

wiki>Ped7g: Making the description a bit more detailed.

2019-01-06T23:27:34Z

Making the description a bit more detailed.

← Older revision		Revision as of 00:27, 7 January 2019
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	Palette indices 128-255 are PAPER colours. Entries 128-135 are the standard Spectrum PAPER colours and BORDER colours (even in "full INK" mode).		Palette indices 128-255 are PAPER colours. Entries 128-135 are the standard Spectrum PAPER colours and BORDER colours (even in "full INK" mode).

	Higher colours can only be used by enabling ULANext mode via {{NextRegNo\|$43}}.		Higher colours can only be used by enabling ULANext mode via {{NextRegNo\|$43}}. The split of attribute bits between INK and PAPER values is selected by INK-mask set via {{NextRegNo\|$42}}.

	Layer 2 and ~~Sprite~~ palettes work as "full ink" always, INK/PAPER concept does apply only to Enhanced ULA palette.		Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to Enhanced ULA palette.

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

2018-12-22T21:03:50Z

Rewording a bit and adding info from web docs.

← Older revision		Revision as of 22:03, 22 December 2018
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	{{NextRegister		{{NextRegister
	\|Number=$40		\|Number=$40
	\|Readable=No		\|Readable=Yes
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Chooses a ULANext palette ~~number~~ to configure.		\|ShortDesc=Chooses an ULANext palette index to configure.
	}}		}}
			Palette indices 0-127 are INK colours. Entries 0-7 are the standard Spectrum INK colours (except full ink colour mode, when all 0-255 indices are INK colour).

	Palette ~~numbers from 0~~-~~127~~ are ~~INK colors~~. Entries 0-7 are the standard Spectrum INK ~~colors~~.		Palette indices 128-255 are PAPER colours. Entries 128-135 are the standard Spectrum PAPER colours and BORDER colours (even in "full INK" mode).

	~~Palette numbers from 128-255 are PAPER colors. Entries 0-7 are the standard Spectrum PAPER colors and border colors~~.		Higher colours can only be used by enabling ULANext mode via {{NextRegNo\|$43}}.

	~~Higher colors can~~ only ~~be used by enabling ULANext mode via {{NextRegNo\|$43}}~~.		Layer 2 and Sprite palettes work as "full ink" always, INK/PAPER concept does apply only to Enhanced ULA palette.

wiki>Hyphz at 17:23, 27 August 2017

2017-08-27T17:23:57Z

← Older revision		Revision as of 18:23, 27 August 2017
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	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
	\|ShortDesc=Chooses a ULANext palette number to configure~~, and toggles repurposed FLASH bit~~.		\|ShortDesc=Chooses a ULANext palette number to configure.
	}}		}}

			Palette numbers from 0-127 are INK colors. Entries 0-7 are the standard Spectrum INK colors.

			Palette numbers from 128-255 are PAPER colors. Entries 0-7 are the standard Spectrum PAPER colors and border colors.

			Higher colors can only be used by enabling ULANext mode via {{NextRegNo\|$43}}.

wiki>Hyphz at 23:25, 21 August 2017

2017-08-21T23:25:57Z

← Older revision		Revision as of 00:25, 22 August 2017
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	\|Readable=No		\|Readable=No
	\|Writable=Yes		\|Writable=Yes
			\|ShortDesc=Chooses a ULANext palette number to configure, and toggles repurposed FLASH bit.
	}}		}}

wiki>Hyphz: Created page with "{{NextRegister |Number=$40 |Readable=No |Writable=Yes }}"

2017-08-21T20:50:20Z

Created page with "{{NextRegister |Number=$40 |Readable=No |Writable=Yes }}"

New page