When programming, the raster "Raster" is often referred a demo term which refers to as the act of modifying the setting colours while the picture is being drawn by the display (TV or monitor). This is done to display more than the usual [[Video modes]] number of inks between 2 scanlines, in interrupt modecolours.
This is a way to The display more than draws one line every 64microseconds, with the usual whole image drawn at a frequency of 50Hz.The [[Video modesCPU]] number ([[Z80]]) runs at about 4 MHz. Most instructions are multiples of coloursa microsecond and this makes timing for making rasters easy.
The time between the display of 2 Scanlines traditional raster is made by changing the CRTC allow the CPU to order the Gate array to modify the setting colour for one pen once each line creating a horizontal bar of inkscolour.
The screen is updated with a frequency of 50Hz...The [[CPU]] ([[Z80]]) runs at about 4 MHz. So It has enough cycles between 2 scanlines to order this. You But changing the colours can also use Split raster be used to "actually" display 2 have different screensareas of the screen in different colours, sometimes with different Video Modese. This also allows g. for a status panel and a Graphic heavy [[HUD]] with no interference with [[Scrolling]]game area.
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