Atari ST VGA Cable Procedures
Atari ST VGA Cable Procedures - February 18th 2006 - v1.01.
1. Introduction. 2. Atari ST 13-Pin DIN Pinouts. 3. Standard VGA Pinouts. 4. Level Adjusting Resistors. 5. Atari ST to VGA Connector Wiring Assignments. 6. VGA Common Grounds. 7. References.
1. Introduction.
This document discusses building a monochrome vga cable for the Atari ST. It is relatively straightforward and no more complicated than connecting the right pins together.
2. Atari ST 13-Pin DIN Pinouts.
The following is viewed from the back of the connector, ie. solder connections;
* * * * 4 3 2 1 * * * * 8 7 6 5 * * * * 12 11 10 9 * 13 1 = Audio Output 2 = Composite Video 3 = General Purpose Output 4 = Monochrome Detect 5 = Audio In 6 = Green 7 = Red 8 = Plus 12-Volt Pullup 9 = Horizontal Sync 10 = Blue 11 = Monochrome 12 = Vertical Sync 13 = GND
3. Standard VGA Pinouts.
The following is viewed from the back of the female connector, ie. solder connections;
* * * * * 1 2 3 4 5 * * * * * 6 7 8 9 10 * * * * * 11 12 13 14 15 1 = RED 2 = GREEN 3 = BLUE 4 = ID2 5 = GND 6 = RED GND 7 = GREEN GND 8 = BLUE GND 9 = KEY/NC 10 = SYNC GND 11 = ID0 12 = ID1 13 = Horizontal Sync 14 = Vertical Sync 15 = ID3
4. Level Adjusting Resistors.
Resistors of 150ohms to be placed on the Red, Green, and Blue lines.
5. Atari ST to VGA Connector Wiring Assignments.
ST Signal Name | 13-Pin DIN | VGA | VGA Signal Name |
---|---|---|---|
Audio Output | 1 | ||
Monochrome Detect | 4 | 5 | GND |
Horizontal Sync | 9 | 13 | Horizontal Sync |
Monochrome | 11 | 1+3+5 | Red+Green+Blue |
Vertical Sync | 12 | 12 | Vertical Sync |
GND | 13 | 5 | GND |
6. VGA Common Grounds.
A number of the pins within the female VGA connector need to be shorted to GND. Pins 4,5,6,7,8,9,10, and 11. On the actual connector, these are as follows, viewing from behind;
* * * *----* 1 2 3 4 5 \ *----*----*----*----* 6 7 8 9 10 / * * * * * 11 12 13 14 15
7. References.
http://www.howell1964.freeserve.co.uk/Atari/ST/Atari_ST_Video.htm
http://www.algonet.se/~guld1/hardware/atari-scart.html
http://www.volny.cz/milarb/Atari/specable.txt