Pin-Out Assignments For Various Computer Connectors

 Parallel - 25 Pin Connector (PC
              Side)

 Pin Signal Description Direction
 1   Strobe             Out
 2   Data 1             Out
 3   Data 2             Out
 4   Data 3             Out
 5   Data 4             Out
 6   Data 5             Out
 7   Data 6             Out
 8   Data 7             Out
 9   Data 8             Out
 10  Acknowledge        In
 11  Busy               In
 12  Paper Out          In
 13  Select             In
 14  Auto Feed          Out
 15  Error              In
 16  Initialize Printer Out
 17  Select Input       Out
 18  Data 1 Ground
 19  Data 2 Ground
 20  Data 3 Ground
 21  Data 4 Ground
 22  Data 5 Ground
 23  Data 6 Ground
 24  Data 7 Ground
 25  Data 8 Ground
   36 Pin Centronix Connector

 PinNmenomic Description
 1           Strobe
 2           Data 0
 3           Data 1
 4           Data 2
 5           Data 3
 6           Data 4
 7           Data 5
 8           Data 6
 9           Data 7
 10 ACK      Acknowledge
 11          Busy
 12          Paper Out
 13          Select
 14 PI       Auto LF (PI Ground)
 15 PI       (PI)
 16 GND      Ground
 17          Frame Ground
 18          +5 Volt Test
 19          Ground
 20          Ground
 21          Ground
 22          Ground
 23          Ground
 24          Ground
 25          Ground
 26          Ground
 27          Ground
 28          Ground
 29          Ground
 30          Ground
 31          Input Prime (Spare)
 32 SLCT     Error
 33          Ground
 34          N/C (Spare)
 35          +5V
 36          Select In (Spare)

[50 Pin Lineprinter Pinout]

 Large 50 Pin Connector (I'm making
     up my own numbering scheme)

 Pin Mnemonic Description
 1-2          Ready
 1-3          On Line
 1-4          Shorted to 1-5
 1-5          Shorted to 1-4
 1-6          Data Strobe
 1-8          Data 6
 1-9          Data 5
 1-10         Data 4
 1-11         Data 3
 1-12         Data 2
 1-13         Data 1
 2-1          Ground - Ready
 2-2          Ground - Online
 2-4
 2-5          Ground Data Strobe
 2-7          Ground - Data 6
 2-8          Ground - Data 5
 2-9          Ground - Data 4
 2-10         Ground - Data 3
 2-11         Ground - Data 2
 2-12         Ground - Data 1
 3-3          Interface Verification
 3-5          Data 7
 3-6          Data 8
 3-12         Data Request
 3-13
 4-3          Interface Verification
 4-5          Ground - Data 7
 4-6          Ground - Data 8
 4-12         Ground - Data Request
 Game/Joystick - 15 Pin
  Connector (Game Port
  Side/Standard "IBM"
         Type)

 PinSignal Description
 1  +5 Volts DC
 2  Button 0
 3  Position 0
 4  Ground
 5  Ground
 6  Position 1
 7  Button 1
 8  +5 Volts DC
 9  +5 Volts DC
 10 Button 2
 11 Position 2
 12 Ground
 13 Position 3
 14 Button 3
 15 Button 2

      Keyboard Connector Pinouts (PC Side)

                   5 Pin DIN  6 PinPS/2  6 Pin
 Signal Description
                   AT Type    Mini-DIN   SDL
 Keyboard data     2          1          B
 Signal Ground     4          3          C
 +5 Volts          5          4          E
 Keyboard Clock    1          5          D
 Not Used/ConnectedNone       2          A
 Not Used/ConnectedNone       6          F
 Not Used/Connected3          None       None

Pinouts - Serial (RS232/RS422A)

        RS-323 25 Pin Serial Port

 PinNmenomic Description
 1  GND      Frame Ground
 2  TD       Transmit Data
 3  RD       Receive Data
 4  RTS      Request To Send
 5  CTS      Clear To Send
 6  DSR      Data Set Ready
 7  GND      Signal Ground
 8  CD       Carrier Detect
 9           Transmit Current Loop Return
 11          Transmit Current Loop Data
 18          Receive Current Loop Data
 20 DTR      Data Terminal Ready
 22 RI       Ring Indicator
 25          Receive Current Loop Return

     RS232C 9 Pin Connector

 PinNmenomic Description
 1  CD       Carrier Detect
 2  RD       Receive Data
 3  TD       Transmit Data
 4  DTR      Data Terminal Ready
 5  GND      Signal Ground
 6  DSR      Data Set Ready
 7  RTS      Request To Send
 8  CTS      Clear To Send
 9  RI       Ring Indicator

[6 Pin MMJ Connector]

       Digital MMJ Connector

 PinNmenomic Description
 1  DTR      Dat Terminal Ready
 2  TXD+     Transmited Data
 3  TDX-     Transmit Signal Ground
 4  RXD-     Receive Signal Ground
 5  RXD+     Receive Signal
 6  DSR      Data Set Ready
    RS-422A - 9 Pin Connector

 PinNmenomic Description
 1  GND      Signal Ground
 2  RD       Receive Data
 3  TD       Transmit Data
 4  DTR      Data Terminal Ready
 5  GND      Signal Ground
 6  DSR      Data Set Ready
 7  RTS      Request To Send
 8  CTS      Clear To Send
 9  RI       Ring Indicator
   RS-422A - 25 Pin Connector

 PinNmenomic Description
 2  TD       Transmit Data
 3  RD       Receive Data
 4  RTS      Request To Send
 5  CTS      Clear Tp Send
 6  DSR      Data Set Ready
 7  GND      Signal Ground
 8  CD       Carrier Detect
 20 DTR      Data Terminal Ready
 22 RI       Ring Indicator