Difference between revisions of "Rasters"
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(Created page with 'In programation, the raster is often referred as the act to modify the setting of inks between 2 scanlines. This is a way to display more than the usual Video modes number o…') |
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| − | In programation, the raster is often referred as the act to modify the setting of inks between 2 scanlines. | + | In programation, the raster is often referred as the act to modify the setting of inks between 2 scanlines, in interrupt mode. |
This is a way to display more than the usual [[Video modes]] number of colours. | This is a way to display more than the usual [[Video modes]] number of colours. | ||
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So It has enough cycles between 2 scanlines to order this. | So It has enough cycles between 2 scanlines to order this. | ||
| − | You can also use Split | + | You can also use Split raster to "actually" display 2 different screens, sometimes with different Video Modes. This also allows a Graphic heavy [[HUD]] with no interference with [[Scrolling]]. |
Revision as of 16:42, 13 October 2009
In programation, the raster is often referred as the act to modify the setting of inks between 2 scanlines, in interrupt mode.
This is a way to display more than the usual Video modes number of colours.
The time between the display of 2 Scanlines by the CRTC allow the CPU to order the Gate array to modify the setting of inks.
The screen display at 50Hz...The CPU (Z80) runs at about 4 MgHz.
So It has enough cycles between 2 scanlines to order this.
You can also use Split raster to "actually" display 2 different screens, sometimes with different Video Modes. This also allows a Graphic heavy HUD with no interference with Scrolling.
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