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Atari ST to VGA with Mono/Color switch
This is a special cable for monitors that can handle a 15 kHz signal at the VGA input.
There is a 4PDT switch that changes the colour RGB lines and the monochrome signal to a VGA connector.
The fourth pole of the switch is used for monochrome signal detection.
DIN 13 pin female on cable
ST video out
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VGA male on cable
VGA
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| 7 |
Red via switch |
1 |
| 6 |
Green via switch |
2 |
| 10 |
Blue via switch |
3 |
| 11 |
Monochrome out via switch |
1, 2, 3 |
| 4 |
Monochrome detect via switch to GND |
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| 9 |
Horizontal sync |
13 |
| 12 |
Vertical sync |
14 |
| 13 |
GND |
5, 6, 7, 8, 10 |
Use resistors 75R - 150R in RGB lines for signal attenuation.
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