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Document Title: [Atari System 1.txt (text file)]

Atari System-1 Motherboard Pinouts 
==================================

 P108 Video
 ----------
 1 Video Return
 2 Blue
 3 Green
 4 Red
 5 V Sync
 6 key
 7 Comp Sync
 8 H Sync
 
 P104 Input
 ----------
 1  +5
 2  Coin Counter
 3  Coin Counter 2
 4  N.U.
 5  Self Test
 6  Aux Coin Switch
 7  N.U.
 8  Key
 9  Left Coin SW
 10 Right Coin SW
 11 Gnd
 
 P105 Sound
(note outputs are line level and need an external amp to drive a speaker)
 ----------
 1 Self Test
 2 Right Return (ground for audio)
 3 Right Audio (to amp section on AR/III board)
 4 Left Return (ground for audio)
 5 Key
 6 Left Audio  (to amp section on AR/III board)
 
 P101 Power
 ----------
 1  Return (ground)
 2  + sense
 3  +5 V
 4  +10.3 V Reset (unreg)
 5  - sense
 6  -15 V
 7  unused
 8  RTN (ground)
 9  +15 V
 10 +5 V
 11 +5 V
 12 Return (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
 

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