Controller Port (male jack)(4 on 400/800, 2 on all others):
      1         5
       o o o o o
        o o o o
       6       9                      trackball (CX22) meanings:
1. (Joystick) Forward Input-  -  -  -  -  X Direction
2. (Joystick) Back Input  -  -  -  -  -  -X Motion
3. (Joystick) Left Input -  -  -  -  -  - Y Direction
4. (Joystick) Right Input  -  -  -  -  -  Y Motion
5. B Potentiometer Input
6. Trigger Input/Light Pen/Light Gun Input (400 supports a light pen or
7. +5V                                      light gun in port 4 only)
8. Ground
9. A Potentiometer Input

Serial I/O (SIO)/Peripheral port (male jack)(all machines):
         2           12
          o o o o o o
         o o o o o o o
        1             13
1. Clock Input             8. Motor Control
2. Clock Output            9. Proceed'
3. Data Input             10. +5V/Ready (1200XL lacks +5V thanks to current
4. Ground                     limit resistor R63.  Replace R63 with a jumper
5. Data Output                wire to enable +5V on this pin on the 1200XL.)
6. Ground                 11. SIO Audio Input
7. Command'               12. 400/800: +12V ; XL/XE: Not Connected
                          13. Interrupt'

Monitor port (female jack): (all but 400, NTSC 600XL, SECAM 800XL,
3 o     o 1                  SECAM 130XE, XEgs)
   o   o
 5   o   4
     2
1. Composite Luminance (except PAL 600XL: Not Connected)
2. Ground
3. Audio Output
4. Composite Video
5. Composite Chrominance (except 1200XL: Not Connected; PAL 600XL: Ground;
                          all but very late-production 800XL: Not Connected)

Monitor port (female jack)(SECAM 800XL, SECAM 130XE):
THIS PINOUT REMAINS QUESTIONABLE.  STILL LOOKING FOR DOCUMENTATION FROM A
NON-WEB SOURCE.
   5       1     1. +12V 5mA max (Select - held at +5V to cause the TV to
    o  6  o                       switch to this video source)
       o         2. Audio (High Level - amplitude about 6 x regular Audio -
    o     o                unused by Atari-distributed Peritel cable)
   4   o   2     3. Audio
       3         4. Composite Video
                 5. Ground (common for audio & video)
                 6. +5V 100mA max (UHF power modulator - 
                                   unused by Atari-distributed Peritel cable)

     The standard video cable provided by Atari France with every
     SECAM 800XL (? and 130XE ?) has the male 6-pin DIN on one end, and a
     standard male Peritel connector on the other end, with this pinout:

     2. Audio (right channel, from port pin #3)       _20_________________2_
     4. Ground (for audio, from port pin #5)          \ o o o o o o o o o o |
     6. Audio (left channel, from port pin #3)     (21)\ o o o o o o o o o o|
     8. +5V (Select, from port pin #1)                  19------------------1 
     17. Ground (for video, from port pin #5)            
     20. Composite video (from port pin #4)

Power (female jack)(all but 400,800,1200XL):
    7     6        1. +5V
     o   o         2. Shield
  3 o     o 1      3. Ground
     o   o         4. +5V
   5   o   4       5. Ground
       2           6. +5V
                   7. Ground

Cartridge Slot (present on all machines; Left Cartridge Slot on 800):
     A  B  C  D  E  F  H  J  K  L  M  N  P  R  S
     o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
     o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
     1                                         15
 1. S4' Chip Select--$8000 to $9FFF  A. RD4 ROM present--$8000 to $9FFF
 2. A3 CPU Address bus line          B. GND Ground
 3. A2 CPU Address bus line          C. A4 CPU Address bus line
 4. A1 CPU Address bus line          D. A5 CPU Address bus line
 5. A0 CPU Address bus line          E. A6 CPU Address bus line
 6. D4 CPU Data bus line             F. A7 CPU Address bus line
 7. D5 CPU Data bus line             H. A8 CPU Address bus line
 8. D2 CPU Data bus line             J. A9 CPU Address bus line
 9. D1 CPU Data bus line             K. A12 CPU Address bus line
10. D0 CPU Data bus line             L. D3 CPU Data bus line
11. D6 CPU Data bus line             M. D7 CPU Data bus line
12. S5' Chip Select--$A000 to $BFFF  N. A11 CPU Address bus line
13. +5V                              P. A10 CPU Address bus line
14. RD5 ROM present--$A000 to $BFFF  R. R/W' CPU read/write
15. CCTL' Cartridge control select   S. B02,Phi2 CPU Phase 2 clock

Right Cartridge Slot (800 only):
     A  B  C  D  E  F  H  J  K  L  M  N  P  R  S
     o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
     o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
     1                                         15
 1. R/W' CPU read/write late         A. B02,Phi2 CPU Phase 2 clock
 2. A3 CPU Address bus line          B. GND Ground
 3. A2 CPU Address bus line          C. A4 CPU Address bus line
 4. A1 CPU Address bus line          D. A5 CPU Address bus line
 5. A0 CPU Address bus line          E. A6 CPU Address bus line
 6. D4 CPU Data bus line             F. A7 CPU Address bus line
 7. D5 CPU Data bus line             H. A8 CPU Address bus line
 8. D2 CPU Data bus line             J. A9 CPU Address bus line
 9. D1 CPU Data bus line             K. A12 CPU Address bus line
10. D0 CPU Data bus line             L. D3 CPU Data bus line
11. D6 CPU Data bus line             M. D7 CPU Data bus line
12. S4' Chip Select--$8000 to $9FFF  N. A11 CPU Address bus line
13. +5V                              P. A10 CPU Address bus line
14. RD4 ROM present--$8000 to $9FFF  R. R/W' Read/write
15. CCTL' Cartridge control select   S. B02,Phi2 CPU Phase 2 clock

Parallel Bus Interface (PBI) (600XL and 800XL only):
 1                                                                       49
 o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
 o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
 2                                                                       50
  1. GND Ground                    2. EXTSEL' External Select
  3. A0 CPU Address bus line       4. A1 CPU Address bus line
  5. A2 CPU Address bus line       6. A3 CPU Address bus line
  7. A4 CPU Address bus line       8. A5 CPU Address bus line
  9. A6 CPU Address bus line      10. GND Ground
 11. A7 CPU Address bus line      12. A8 CPU Address bus line
 13. A9 CPU Address bus line      14. A10 CPU Address bus line
 15. A11 CPU Address bus line     16. A12 CPU Address bus line
 17. A13 CPU Address bus line     18. A14 CPU Address bus line
 19. GND Ground                   20. A15 CPU Address bus line
 21. D0 CPU Data bus line         22. D1 CPU Data bus line
 23. D2 CPU Data bus line         24. D3 CPU Data bus line
 25. D4 CPU Data bus line         26. D5 CPU Data bus line
 27. D6 CPU Data bus line         28. D7 CPU Data bus line
 29. GND Ground                   30. GND Ground
 31. B02,Phi2 CPU Phase 2 clock   32. GND Ground
 33. NC Reserved                  34. RST' Reset output
 35. IRQ' Interrupt request       36. RDY' Ready input
 37. NC Reserved                  38. EXTENB' CPU External decoder Enable
 39. NC Reserved                  40. REF' Refresh cycle
 41. CAS' Column Address Strobe   42. GND Ground
 43. MPD' Math Pack (FP) Disable  44. RAS' Row Address Strobe
 45. GND Ground                   46. LR/W' Latched read/write
 47. 800XL: NC. 600XL: +5V        48. 800XL: NC. 600XL: +5V
 49. Audio input                  50. GND Ground

Enhanced Cartridge Interface (ECI)/Expansion port (130XE, 800XE, & later 65XE)
     A B C D E F H
     o o o o o o o
     o o o o o o o
     1           7
A. Reserved                  1. EXTSEL' External Select
B. IRQ' Interrupt request    2. RST' Reset output
C. HALT' Halt CPU            3. D1XX' Chip select at area $D1xx
D. A13 CPU Address bus line  4. MPD' Math Pack (FP) Disable
E. A14 CPU Address bus line  5. Audio input
F. A15 CPU Address bus line  6. REF' Refresh cycle
H. GND Ground                7. +5V

Keyboard Port (XE System console only):
           1               8
            o o o o o o o o
             o o o o o o o
            9             15
1. KR2 Keyboard Response   8. K2 Keyboard Scan
2. K3 Keyboard Scan        9. Ground
3. K4 Keyboard Scan       10. Not Connected
4. K5 Keyboard Scan       11. Ground
5. KR1 Keyboard Response  12. Not Connected
6. K0 Keyboard Scan       13. Trigger 2
7. K1 Keyboard Scan       14. 5 VDC
                          15. 5 VDC