TEA1002

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The TEA1002 is a PAL video encoder chip[1] produced by Mullard in 1982 and used on the Mattel Aquarius and AlphaTantel computers.[2][3] It was also used on teletext decoders and color bar generators associated with video test equipment[4][5]

The chip is capable of displaying 320 x 192 pixels (within borders), 40x24 text blocks (with 8 x 8 pixel character block) and 80x72 addressable graphics. It generates 16 colors based on Luminance, Chrominance and Saturation and according to 75 % color bars.


Levels[]

According to the TEA1002 datasheet,[1] colors are formed by the combination of three signals. The following table lists the internal signals and shows an approximation of the generated colors, as seen on a web standard sRGB monitor. Colors could be different when seen on a CRT TV. Internally colors are stored in a 4 bit RGBI arrangement. There are three bits for the RGB components (generating 8 primary colors) and an intensity bit that generates a variation (75% luminance intensity for white, creating gray; 50% chroma saturation decrease for the RGB primaries).

Color Luminance % (75% EBU color bars) Chroma (º) Chroma (%)
Black 0.0 - -
Red 22.5 103 48
Green 44.0 241 44
Yellow 66.5 167 33
Blue 8.5 347 33
Magenta 31.0 61 44
Cyan 52.5 283 48
White 100.0 - -
Grey 75.0 - -
Cyan 52.5 283 24
Magenta 31.0 61 22
Blue 8.5 347 17
Yellow 66.5 167 17
Green 44.0 241 22
Red 22.5 103 24
Black 0.0 - -

See also[]

References[]

  1. ^ a b "TEA1002 Datasheet | Mullard - Datasheetspdf.com". datasheetspdf.com.
  2. ^ "Machine: Mullard TEA1002 PAL colour encoder (tea1002)". arcade.vastheman.com.
  3. ^ "Machine: AlphaTantel (alphatan)". arcade.vastheman.com.
  4. ^ http://messui.polygonal-moogle.com/comp/tea1002.pdf
  5. ^ "TEA1002 PAL COLOUR ENCODER AND VIDEO SUMMER | Fabian Enterprises Ltd". www.fabian.com.mt.
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