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Encyclopedia > GTIA

George's Television Interface Adapter is the successor to the CTIA chip used in the Atari 8-bit Computers. The GTIA chip was also used in the Atari 5200 as well. George McLeod designed the chip.


The GTIA chip added the following capabilities to the existing CTIA:

  • 256 colors instead of 128. This was done by increasing the valid luminance values from 8 to 16.
  • 3 additional graphics modes. All 3 modes are 80x192 pixels, with the difference being in the colors allowed -- one mode allows for 16 shades of a single hue, one allows for 16 hues with a single shade/luminance value, and the last one allows for 9 colors of any hue/luminance.

In addition, due to differences in how the CTIA and the GTIA interface with the television, programs that depend on artifact effects will display differently.


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GTIA - Wikipedia (268 words)
Um diese Darstellung beeinflussen zu können, enthielt der GTIA eine Reihe programmierbarer Register, mit denen z.B. das "tatsächliche Aussehen" der Farben bestimmt werden konnte, die der ANTIC darstellen sollte.
Der GTIA kümmerte sich um die Bewegung dieser Elemente, er bestimmte, ob ein Player/Missile vor oder hinter einem bestimmeten Teil des Grafikbildes erschien, und er war in der Lage, Kollisionen zwischen Player, Missiles und der restlichen Grafik festzustellen.
Diese Technik entlastete den Prozessor erheblich bei der Darstellung bewegter Grafik.
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