Defender

Released - 1981

Upright Cabinet

• Overall Dimensions/Weight

Height	Width	Depth	Weight
72"	26"	32.5" (32 1/2")	265 lbs.

• Marquee Information

Height	Width
7.75" (7 3/4")	24.375" (24 3/8")

• Control Panel Information

  Joystick

  • 2-Way_Leaf_Switch_Joystick (up, down)

  Buttons

  • 5 Fire-Thrust-Reverse-Hyperspace-Smart Bomb

Cocktail Cabinet

• Overall Dimensions/Weight

Documentation

Drawings/Schematics

Early Drawings (no content yet)

• Front Cover

Later Drawings

• Front Cover
• Table Of Contents
• Board Layout Diagram 1
• Board Layout Diagram 2
• MPU Layout Diagram 1 (R8570)
• MPU Layout Diagram 2 (Parts List) (R8570)
• MPU Schematic/Logic 1 (R8570)
• MPU Schematic/Logic 2 (R8570)
• Interface/Widget Board (C8573)
• ROM Board Layout Diagram (D8572)
• ROM Board Schematic (D8572)
• Power Supply Diagram (D8359)
• Power Supply Schematic (D8359)
• Cabinet Power Schematic
• Power Board Diagram (D8373)
• Early Sound Board Diagram/Layout (D8121)
• Early Sound Board Schematic (D8121)
• Later Sound Board Diagram/Layout (D8224)
• Later Sound Board Schematic (D8224)

• Manual Stored Here
• Parts Catalog Stored Here

Boards

Interface Board (I/O, Widget)

Click here for more information..

Description: The interface board is used to provide input ports that allow the physical connection of user inputs from the Control Panel. This board uses a 6821 PIA (peripheral interface adapter) that digitizes all inputs and provides the switch state to the MPU board when requested.

• Jumpers

  • W1
    • Is used to identify to the system if the game is an Upright or Cocktail
    • W1 Removed - Cocktail Game - Screen Flip and unique controls (+5v Pull-Up resistor to PIA)
    • W1 Installed - Upright Game - 2 Players share same controls, no screen flip (Connects PIA input to Ground)
    • Notes: Green Rom Version has no support for Cocktail Mode
  • W2
    • Is used to allow the program to enable or disable the Multiplexers (Muxers)
    • W2 should always be connected there is no reason to remove jumper

• Connections

  • Upright
    • 3J2 Connector (Upper - Furthest from ribbon cable - Pin 1 is lowest - 10 Pin Molex PCB Headers - .156")
    1. 'Fire' Button - (ORG-BRN) - PIA Pin 2
    2. 'Thrust' Button - (ORG-RED) - PIA Pin 3
    3. 'Smart Bomb' Button - (ORG) - PIA Pin 4
    4. 'Hyperspace' Button - (ORG-YEL) - PIA Pin 5
    5. '2-Player Start' Button - (ORG-GRN) - PIA Pin 6
    6. '1-Player Start' Button - (ORG-BLU) - PIA Pin 7
    7. 'Reverse' Button - (ORG-VIO) - PIA Pin 8
    8. 'Down' Joystick - (ORG-GRY) - PIA Pin 9
    9. Key (Pin Removed)
    10. NC (No Connection)
    • 3J3 Connector (Lower closest to ribbon cable - Pin 1 is lowest - 10 Pin Molex PCB Headers - .156")
    1. Up' Joystick - (ORG-WHT) - PIA Pin 10
    2. NC (No Connection)
    3. NC
    4. NC
    5. NC
    6. Key - Pin Removed
    7. NC
    8. NC
    9. NC
    10. Ground - (ORG-BLK) - Common to all switches and joystick
  • Cocktail
    • 3J2 Connector (Upper - Furthest from ribbon cable - Pin 1 is lowest - 10 Pin Molex PCB Headers - .156")
    1. 'Fire' Button (P1) - (ORG-BRN) - PIA Pin 2
    2. 'Thrust' Button (P1) - (ORG-RED) - PIA Pin 3
    3. 'Smart Bomb' Button (P1) - (ORG) - PIA Pin 4
    4. 'Hyperspace' Button (P1) - (ORG-YEL) - PIA Pin 5
    5. '2-Player Start' Button (P1) - (ORG-GRN) - PIA Pin 6
    6. '1-Player Start' Button (P1) - (ORG-BLU) - PIA Pin 7
    7. 'Reverse' Button (P1) - (ORG-VIO) - PIA Pin 8
    8. 'UP' Joystick (P1) - (ORG-GRY) - PIA Pin 9
    9. Key (Pin Removed)
    10. Ground - (RED-BLK) - Common to all P2 Controls)
    • 3J3 Connector (Lower closest to ribbon cable - Pin 1 is lowest - 10 Pin Molex PCB Headers - .156")
    1. Down' Joystick (P1)- (ORG-WHT) - PIA Pin 10
    2. 'Up' Joystick (P2) - (RED-BRN)
    3. 'Thrust' Button (P2) - (RED)
    4. 'Smart Bomb' Button (P2) - (RED-ORG)
    5. 'Hyperspace' Button (P2) - (RED-YEL)
    6. Key - Pin Removed
    7. 'Reverse' Button (P2) - (RED-VIO)
    8. 'Fire' Button (P2) - (RED-GRY)
    9. 'Down' Joystick (P2) - (RED-WHT)
    10. Ground - (ORG-BLK) - (Common to all P1 Controls)

• Ribbon Cable - Pinout

  1. D4 - PIA Pin 29
  2. NMI(NOT) - PIA No Connection
  3. D7 - PIA Pin 26
  4. FIRQ(NOT) - PIA No Connection
  5. D6 - PIA Pin 27
  6. RW (Read/Write) - PIA Pin 21
  7. D5 - PIA Pin 28
  8. Reset(NOT) - PIA Pin 34
  9. D2 - PIA Pin 31
  10. +5vdc (Power for board) - PIA Pin 20
  11. D1 - PIA Pin 32
  12. D0 - PIA Pin 33
  13. D3 - PIA Pin 30
  14. E(Enable) - PIA Pin 25
  15. PIA(NOT) - PIA Pin 23 via IC4(14049 Hex Inverter Pin 11 to 12)
  16. Ground - PIA Pin 6
  17. A0 - PIA Pin 36
  18. A1 - PIA Pin 35
  19. A2 - PIA Pin 24
  20. A3 - PIA Pin 22 via IC4(14049 Hex Inverter - Pin 9 to 10)

Software

High Score Table Initials Decoded:

DRJ – Eugene Jarvis. Designer, programmer.

SAM – Sam Dicker. Programmer.

LED – Larry DeMar. Programmer.

PGD – Paul Dussault. Programmer.

CRB – Chuck Bleich. Hardware engineering.

MRS – Mike Stroll. Head of Engineering at Williams.

SSR – Steve Ritchie. An engineer at Williams primarily involved in pinball, did not work directly on Defender.

TMH – Tom Hart. Hardware engineer.