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Atari System-1 Motherboard Pinouts
I typed these up for someone and thought I may as well post them :-) I'll send a copy to wiretap as well.

Atari System-1 Motherboard Pinouts taken from the Schematics.

Typed by: Michael Stormoen (mike@2084.com)

P108
------
1 Vid Rtn
2 Blue
3 Green
4 Red
5 V Sync
6 key
7 Comp Sync
8 H Sync

P104
------
1 +5
2 Coin Counter
3 Coin Counter 2
4 Unused
5 Self Test
6 Aux Coin Switch
7 Unused
8 Key
9 Left Coin SW
10 Right Coin SW
11 Gnd

P105
------
1 Self Test
2 Right Rtn (ground for audio)
3 Right Audio (to amp section on AR/III board)
4 Left Rtn (ground for audio)
5 Key
6 Left Audio (to amp section on AR/III board)

P101
------
1 RTN (ground)
2 + sense
3 +5
4 +10.3 V Reset
5 - sense
6 -15
7 unused
8 RTN (ground)
9 +15
10 +5
11 +5
12 RTN (ground0

Control panel wiring varies from game to game...
Here's what's on the schematics:

J106
------
1 +5
2 n/c
3 LED 2
4 LED 1
5 Key
6 SW 5
7 SW 2
8 SW 4
9 SW 1
10 SW 3
11 GND

J102
------
1 +5
2 Up 2 / Vert. 4
3 Dn 2 / Horz. 4
4 Lt 2 / Vert. 3
5 Rt 1 / Horz. 1
6 Rt 2 / Horz. 3
7 Lt 1 / Vert. 1
8 Up 1 / Vert. 2
9 DN 1 / Horz. 2
10 Key
11 GND

J103
------
1 +5
2 Horz Clk 2
3 Horz Dir 2
4 Vert Clk 2
5 Vert Dir 2
6 Horz Clk 1
7 Horz Dir 1
8 Vert Clk 1
9 Key
10 Vert Dir 1
11 GND

Michael.
www.2084.com
mike@2084.com

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