Clip Window Tilemap Register - Revision history

Ped7g: core 3.0 changes/refresh

2019-11-11T13:36:26Z

core 3.0 changes/refresh

← Older revision		Revision as of 14:36, 11 November 2019
Line 26:		Line 26:

	The X coordinates are internally doubled (40x32 mode) or quadrupled (80x32 mode), and origin [0,0] is 32<sup></sup> pixels left and above the top-left ULA pixel, i.e. Tilemap mode does use same coordinates as Sprites, reaching 32<sup></sup> pixels into "BORDER" on each side.		The X coordinates are internally doubled (40x32 mode) or quadrupled (80x32 mode), and origin [0,0] is 32<sup></sup> pixels left and above the top-left ULA pixel, i.e. Tilemap mode does use same coordinates as Sprites, reaching 32<sup></sup> pixels into "BORDER" on each side.

	<sup>*</sup>) 32 pixels in 40x32 mode, when pixels have identical width with classic ULA and Sprite pixels. In 80x32 mode the pixels have half width, but they cover the identical screen area, so the first ULA pixel is then at [64,32] position out of [0..639,0..255] area.

	The coordinate values are 0,159,0,255 after a Reset.		The coordinate values are 0,159,0,255 after a Reset.

	The displayed area is "inclusive", i.e. for default values full 320x256 (640x256) sprite-pixel area is displayed.		The displayed area is "inclusive", i.e. for default values full 320x256 (640x256) sprite-pixel area is displayed.

			-----
			<sup>*</sup> 32 pixels in 40x32 mode, when pixels have identical width with classic ULA and Sprite pixels. In 80x32 mode the pixels have half width, but they cover the identical screen area, so the first ULA pixel is then at [64,32] position out of [0..639,0..255] area.

Ped7g: core 3.0 changes/refresh

2019-11-11T13:34:58Z

core 3.0 changes/refresh

← Older revision		Revision as of 14:34, 11 November 2019
Line 25:		Line 25:
	Read from register will only read currently selected coordinate, index is not modified (to read next coordinate, write the current coordinate value back, to increment index).		Read from register will only read currently selected coordinate, index is not modified (to read next coordinate, write the current coordinate value back, to increment index).

	The X coordinates are internally doubled (40x32 mode) or quadrupled (80x32 mode), and origin [0,0] is 32<sup></sup> pixels left and above the top-left ULA pixel, i.e. Tilemap mode does use same coordinates as Sprites, reaching 32<sup></sup> pixels into "BORDER" on each side. *) 32 pixels in 40x32 mode, when pixels have identical width with classic ULA and Sprite pixels. In 80x32 mode the pixels have half width, but they cover the identical screen area, so the first ULA pixel is then at [64,32] position out of [0..639,0..255] area.		The X coordinates are internally doubled (40x32 mode) or quadrupled (80x32 mode), and origin [0,0] is 32<sup></sup> pixels left and above the top-left ULA pixel, i.e. Tilemap mode does use same coordinates as Sprites, reaching 32<sup></sup> pixels into "BORDER" on each side.

			<sup>*</sup>) 32 pixels in 40x32 mode, when pixels have identical width with classic ULA and Sprite pixels. In 80x32 mode the pixels have half width, but they cover the identical screen area, so the first ULA pixel is then at [64,32] position out of [0..639,0..255] area.

	The coordinate values are 0,159,0,255 after a Reset.		The coordinate values are 0,159,0,255 after a Reset.

	The displayed area is "inclusive", i.e. for default values full 320x256 (640x256) sprite-pixel area is displayed.		The displayed area is "inclusive", i.e. for default values full 320x256 (640x256) sprite-pixel area is displayed.

Specnext: 1 revision imported

2019-04-14T09:59:51Z

1 revision imported

← Older revision	Revision as of 10:59, 14 April 2019
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wiki>Ped7g: Core 2.00.26 changes

2019-01-31T13:35:13Z

Core 2.00.26 changes

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{{NextRegister
|Number=$1B
|Readable=Yes
|Writable=Yes
|ShortDesc=Sets and reads clip-window for Tilemap.
}}
The coordinates are stored under index:
{| class="wikitable"
|-
! Index !! Coordinate
|-
| 0 || X1 position
|-
| 1 || X2 position
|-
| 2 || Y1 position
|-
| 3 || Y2 position
|}

The current read/write index (which coordinate is selected) can be read or reset by {{NextRegNo|$1C}}.

Write to register will modify currently selected coordinate, and auto-increment index (wrapping from 3 to 0).

Read from register will only read currently selected coordinate, index is not modified (to read next coordinate, write the current coordinate value back, to increment index).

The X coordinates are internally doubled (40x32 mode) or quadrupled (80x32 mode), and origin [0,0] is 32<sup>*</sup> pixels left and above the top-left ULA pixel, i.e. Tilemap mode does use same coordinates as Sprites, reaching 32<sup>*</sup> pixels into "BORDER" on each side. *) 32 pixels in 40x32 mode, when pixels have identical width with classic ULA and Sprite pixels. In 80x32 mode the pixels have half width, but they cover the identical screen area, so the first ULA pixel is then at [64,32] position out of [0..639,0..255] area.

The coordinate values are 0,159,0,255 after a Reset.

The displayed area is "inclusive", i.e. for default values full 320x256 (640x256) sprite-pixel area is displayed.