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Williams Joust 2 information


I have had a couple of dealings with Williams "Joust 2" boards but whenever I needed some information I found almost no help on the internet. I decided to add the few things I picked up with my dealings on them. There are a few references on the internet that Williams "Turkey Shoot" PCB is very similar to "Joust 2" and the schematics/manual can be interchanged but I have not verified this myself. Note: I normally don't work on these boards but may take on a job if I have the time and it's a simple job.

Here is a picture of both ROM and CPU my test bench:

 

Here is what you need to get power to the CPU and see a display on a test monitor. See complete pin outs of the Joust2 board below:

RAM/VIDEO BOARD

J2
1 - Red video
2 - Green video
3 - Blue video
4 - Ground
5 - Vertical Sync
6 - Horizontal Sync
7 - n/c

J3
1 - n/c
2 - Ground
3 - Ground
4 - Ground
5 - n/c
6 - +5v
7 - +5v
8 - n/c
9 - +12v
10 - -5v

 

ROM BOARD

J7
1 - n/c
2 - Ground
3 - Ground
4 - Ground
5 - +12v
6 - +5v
7 - +5v
8 - n/c
9 - +12v
10 - +12v
11 - n/c
12 - -5v

 

You need at least ROM #4 (IC10) on the ROM PCB. When you first boot up a working Joust 2 CPU board you should see the following test map on the screen. All green blocks indicate good ROM and red blocks indicate bad ROM chip (a black block is not a needed location):

 

There are no ROM chips at location #IC11 and #IC54. If any of the ROM chips are bad or missing that are needed for the game you get the following error code flashing on the LED read out on the ROM PCB: 2-0-8 for a bad IC55; 2-1-2 for a bad IC12 and so on.

 

If Specialty Chip IC29 (on CPU PCB) is missing or bad you get a normal rug test then the screen will flash once and then you get a blank screen. You can still coin up games but you won't see any image on screen. If you try to use a Specialty Chip from a Joust or Robotron ROM board they don't seem to work correctly.

 

If PROM IC47 {82s129} on CPU PCB is missing or bad you get no display but game seems to coin up.

 

If PROM IC14 (82s123) on CPU PCB is missing or bad you get no display and game doesn't seem to be working.

 

The 4116 RAM chips are on the CPU PCB and if any one of them are bad you get a 1-1-4 error code flashing for a bad IC114 on the LED display on the ROM board, you may also see this error on the screen if you have a working display; 1-9-8 error code for a bad IC98 and so on.

 

Here is the layout of the CPU board:

 

Here is the layout of the ROM board:

 

(Use at your own risk. I take no responsibility for the accuracy of these pin outs.)

RAM/VIDEO BOARD

J2
1 - Red video
2 - Green video
3 - Blue video
4 - Ground
5 - Vertical Sync
6 - Horizontal Sync
7 - n/c

J3
1 - n/c
2 - Ground
3 - Ground
4 - Ground
5 - n/c
6 - +5v
7 - +5v
8 - n/c
9 - +12v
10 - -5v

 

ROM BOARD (located on the ROM board, bottom right as mounted in the cabinet)

J2
1 - Audio +
2 - Audio -
3 - n/c
4 - Shield

J3
1 - n/c
2 - n/c
3 - n/c
4 - n/c

J4
1 - Coin door?
2 - n/c
3 - Slam switch
4 - Right coin
5 - n/c
6 - Left coin
7 - High score reset
8 - Advance
9 - Auto Up
10 - Ground

J5
1 - n/c
2 - n/c
3 - n/c
4 - n/c
5 - n/c
6 - n/c
7 - n/c
8 - n/c
9 - n/c
10 - n/c
11 - n/c
12 - n/c

J6
1 - 1 player start/transform
2 - 2 player start/transform
3 - n/c
4 - Flap 2
5 - Move right 2
6 - Move left 2
7 - n/c
8 - Flap 1
9 - Move right 1
10 - Ground
11 - n/c
12 - Move left 1

J7
1 - n/c
2 - Ground
3 - Ground
4 - Ground
5 - +12v
6 - +5v
7 - +5v
8 - n/c
9 - +12v
10 - +12v
11 - n/c
12 - -5v

Unlabeled
---------
20 pin ribbon cable from sound board

 

SOUND BOARD

J1
1 - Audio + (from ROM board J2 pin 1)
2 - Audio - (from ROM board J2 pin 2)
3 - n/c
4 - Shield (from ROM board J2 pin 2)

J2
1 - -----\ Red
2 - ---->/ Black Volume Pot
3 - \
4 - -----/ Shield

J3
1 - +5v
2 - Ground
3 - -12v
4 - n/c
5 - +12v
6 - n/c

J4
20 Pin ribbon cable to ROM board

Unlabeled
1 - Speaker +
2 -
3 -
4 - Speaker -

 

Here are some pictures taken from a Williams "Turkey Shoot" game. As you can see the game boards look identical except that the ROM chips are different: