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