TEA1002

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).

ColorLuminance % (75% EBU color bars)Chroma (ยบ)Chroma (%)
Black0.0--
Red22.510348
Green44.024144
Yellow66.516733
Blue8.534733
Magenta31.06144
Cyan52.528348
White100.0--
Grey75.0--
Cyan52.528324
Magenta31.06122
Blue8.534717
Yellow66.516717
Green44.024122
Red22.510324
Black0.0--

See also

References
  1. "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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