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Document Title: [Bubbles.txt (text file)]

Typed in by Jonathan Deitch  (jdeitch@umiami.miami.edu)

Williams Bubbles
----------------

This has four boards ... CPU/Video, ROM, Interface, Sound.


CPU/Video
=========
IJ3 : Monitor Control
            7 : N/C
            6 : Horiz. Sync.
            5 : Vert. Sync.
            4 : Ground
            3 : Blue
            2 : Green
            1 : Red

IJ2 : Memory Protect Interlock
            4 : N/C
            3 : N/C
            2 : Key
            1 : Memory Protect (Inverted)

IJ1 : Power Input
            9 : - 5 V DC
            8 : + 12 V Unregulated
            7 : + 5 V DC
            6 : N/C
            5 : + 12 V DC 
            4 : Key
            3 : Ground
            2 : Ground
            1 : N/C


ROM Board
=========

2J4 : Sound Board Interface
            9 : N/C
            8 : CB2
            7 : PB4
            6 : PB5
            5 : PB2
            4 : PB3
            3 : PB0
            2 : PB1
            1 : N/C

2J3 : Coin Door Switches
       10 : N/C
            9 : Key
            8 : N/C
            7 : Slam Switch
            6 : Center Coin Slot
            5 : Left Coin Slot
            4 : High Score
            3 : Right Coin Slot
            2 : Advance
            1 : Up = Auto, Down = Manual

2J2 : Power Input
            6 : N/C
            5 : N/C
            4 : + 5 V DC
            3 : Key
            2 : N/C
            1 : Ground


Interface Board
===============

3J2 : Not connected

3J3 : Player Panel
       10 : Ground
            9 : N/C
            8 : N/C
            7 : N/C
            6 : Player 2 Start
            5 : Player 1 Start
            4 : Move Right
            3 : Move Left
            2 : Move Down
            1 : Move Up


Sound Board
===========

10J3 : Sound Select (From ROM Board)
            9 : N/C
            8 : CB2
            7 : PB4
            6 : PB5
            5 : PB2
            4 : PB3
            3 : PB0
            2 : PB1
            1 : N/C

10J4 : Volume Control
            4 : Shield
            3 : Key
            2 : Out
            1 : In

10J2 : Speakers
            4 : GND
            3 : N/C
            2 : N/C
            1 : Audio Out : Note - the schematic does not say if this is
                            amplified or not ...

10J1 : Power Input
            9 : Key
            8 : 12 V DC Unregulated
            7 : N/C
            6 : N/C
            5 : GND
            4 : N/C
            3 : + 5 V DC
            2 : + 12 V DC
            1 : N/C

}