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).
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[]
- Thomson EF9345
- Motorola 6845
- Texas Instruments TMS9918
- MOS Technology VIC-II
- List of home computers by video hardware
References[]
- ^ a b "TEA1002 Datasheet | Mullard - Datasheetspdf.com". datasheetspdf.com.
- ^ "Machine: Mullard TEA1002 PAL colour encoder (tea1002)". arcade.vastheman.com.
- ^ "Machine: AlphaTantel (alphatan)". arcade.vastheman.com.
- ^ http://messui.polygonal-moogle.com/comp/tea1002.pdf
- ^ "TEA1002 PAL COLOUR ENCODER AND VIDEO SUMMER | Fabian Enterprises Ltd". www.fabian.com.mt.
- Graphics chips