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 (up, down) Buttons: 5 Fire-Thrust-Reverse-Hyperspace-Smart Bomb

Cocktail Cabinet

• Overall Dimensions/Weight

Documentation

Drawings/Schematics

Early Drawings

• 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)

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 to the MPU board when requested.

• Jumpers W1 and W2

  • 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

  • 20 pins
    • 2 are Ground (Pin 10 on both headers)
    • 2 are cut as keys to prevent the wrong connector from being installed (3J3 - 9, 3J2-6)
    • Upright (Green and Red ROM Versions)
    • 3J3 Connector (Lower closest to ribbon cable - Pin 1 is lowest)