Atari ST VGA Cable Procedures

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Atari ST VGA Cable Procedures - February 18th 2006 - v1.01.

Taken from http://www.logicsays.com/atari/mono/docs/atari_vga.htm by Techie Alison

  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+2+3 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

http://www.notator.org/contributions/st_vga.zip

http://pinouts.ru/Video/VGA15_pinout.shtml

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