Document Title: [Xenophobe Tech.html (html file)]
For testing purposes, you can run the 68000 CPU board without the SOUNDS GOOD daughterboard. Yes, this means that you can quickly power up the game using only +5V, GND, and the video signals. If you hold the TEST pin (J2, pin 8) to GND, you can then ground the SERVICE pin (J2, pin 7) to cycle through the self-test screens. The practical upshot of all this is that having an incomplete board set isn't a show-stopper. You can play the game quite nicely (albeit silently) without the sound board, with no ill effects.
68000 CPU BOARD
---------------
J1 - Power Input (12 pins, .156")
- The CPU board only requires +5V and GND, but if you want to draw +12V
from the auxillary power connector, it's probably a good idea to connect
it here anyways...
1 - GND
2 - GND
3 - +5V
4 - +5V
5 - Key
6 - Reset Out (unused)
7 - GND
8 - +12V (unused - see note on J6)
9 - +5V
10 - +5V
11 - GND
12 - GND
J2 - Inputs IP00 through IP17 (19 pins, .100")
- P1 controls, sound status, coin and utility switches
1 - P1 coin
2 - P2 coin
3 - P3 coin
4 - N/C
5 - STAT0 (to SOUNDS GOOD, J1, pin 6)
6 - Tilt
7 - Service
8 - Test
9 - GND
10 - P1 Up
11 - P1 Down
12 - P1 Left
13 - P1 Right
14 - Key
15 - P1 Trigger
16 - P1 Right Button
17 - P1 Left Button
18 - N/C
19 - GND
J3 - Inputs IP20-IP27, Outputs OP60-OP67, Coin Meter (23 pins, .100")
- P2 controls, sound selection, coin meter
1 - P2 Up
2 - P2 Down
3 - P2 Left
4 - P2 Right
5 - P2 Trigger
6 - P2 Right Button
7 - P2 Left Button
8 - N/C
9 - GND
10 - Sound 0 (to SOUNDS GOOD, J1, pin 4)
11 - Sound 1 (to SOUNDS GOOD, J1, pin 3)
12 - Sound 2 (to SOUNDS GOOD, J1, pin 9)
13 - Sound 3 (to SOUNDS GOOD, J1, pin 8)
14 - Strobe/SIRQ (to SOUNDS GOOD, J1, pin 2)
15 - Sound Reset (to SOUNDS GOOD, J2, pin 9)
16 - N/C
17 - N/C
18 - GND
19 - Key
20 - Meter Return (to GND on power supply)
21 - Coin Meter
22 - GND
23 - GND
J4 - Inputs IP40-IP47, Outputs OP51-OP57 (16 pin, .100")
- P3 controls
1 - P3 Up
2 - P3 Down
3 - P3 Left
4 - P3 Right
5 - P3 Trigger
6 - P3 Right Button
7 - P3 Left Button
8 - Key
9 - N/C
10 - GND
11 - N/C
12 - N/C
13 - N/C
14 - N/C
15 - N/C
16 - N/C
J5 - Video outputs (9 pins, .100")
- Video is separate sync only; there is no composite sync output.
1 - Red
2 - GND
3 - Green
4 - GND
5 - Blue
6 - GND
7 - Key
8 - Horizontal sync
9 - Vertical sync
J6 - Aux Power Input (11 pins, .100")
- This is not used in the "official" setup, but can be used if necessary.
For instance, if your power supply doesn't have enough duplicate outputs
to power up all three boards, you can use J6 to supply the other boards
with any missing voltages. If you want to use +12V on this connector,
you'll have to connect the +12V connector on J1.
1 - GND
2 - GND
3 - +5V
4 - +12V
5 - Key
6 - Reset Out (unused)
7 - Reset Out (unused)
8 - +12V
9 - +5V
10 - GND
11 - GND
SOUNDS GOOD BOARD
-----------------
J1 - Sound Selection/Status (9 pins, .100")
1 - Spare (unused)
2 - Strobe/SIRQ (from CPU, J3, pin 14)
3 - Sound 1 (from CPU, J3, pin 11)
4 - Sound 0 (from CPU, J3, pin 10)
5 - STAT1 (unused)
6 - STAT0 (from CPU, J2, pin 5)
7 - Key
8 - Sound 3 (from CPU, J3, pin 13)
9 - Sound 2 (from CPU, J3, pin 12)
J2 - Power Input (12 pins, .156")
- I'm not sure about the difference between the "A", "E", and "L" grounds;
I've treated the "A"(udio?) and "L"(ogic?) grounds identically and had
acceptable results. Your mileage may vary.
1 - A GND
2 - A GND
3 - +5V
4 - +5V
5 - +12V
6 - +12V
7 - E GND (unused)
8 - Key
9 - Sound Reset (from CPU, J3, pin 15)
10 - Sound Reset
11 - L GND
12 - L GND
J3 - Audio Output (12 pins, .100")
- Volume pot "A" and "B" signals go to the two "sides" of the pot.
The "wiper" goes in the "middle".
1 - Volume pot wiper (to POT)
2 - Left audio out (to DUAL POWER AMP, J1, pin 2)
3 - Right audio out (to DUAL POWER AMP, J1, pin 3)
4 - A GND (to DUAL POWER AMP, J1, pin 3)
5 - A GND
6 - Audio out (unused)
7 - Audio out (unused)
8 - A GND
9 - Key
10 - Volume pot A (to POT)
11 - A GND
12 - Volume pot B (to POT)
DUAL POWER AMP
--------------
This is a small board which amplifies the signals produced by the
"Sounds Good" board and sends them to the speakers. I got mine from
an Omega Race board set from 1981. Judging from the age differential,
it's clear that these are fairly common boards and that they've been
used in many Midway games over the ages. If you can't find one, you
can probably build an equivalent amplifier yourself out of spare parts;
any basic electronics text should tell you what you need to know to do
it yourself.
J1 - Audio Input (8 pins, .100")
1 - N/C
2 - Left audio
3 - Left shield (from SOUNDS GOOD, J3, pin 4)
4 - Key
5 - GND
6 - Right audio
7 - Right shield (unused)
8 - +12V
J2 - Speaker Output (6 pins, .100")
1 - Right speaker +ve
2 - Right speaker -ve
3 - Key
4 - Left speaker +ve
5 - N/C
6 - Left speaker -ve
DUAL POWER AMP WITH MIXER
-------------------------
You can also use a "Dual power amp with mixer" as opposed to the regular
"Dual power amp" board. This board can handle (and presumably mix) four
separate inputs as opposed to two. I've never seen one of these boards,
so again, your mileage may vary...
J1 - Audio Input (11 pins, .100")
1 - L2 shield (unused)
2 - L2 audio (corresponds to DUAL POWER AMP, J1, pin 2)
3 - L1 audio (unused)
4 - L1 shield (corresponds to DUAL POWER AMP, J1, pin 3)
5 - Key
6 - GND
7 - R2 shield (unused)
8 - R2 audio (corresponds to DUAL POWER AMP, J1, pin 6)
9 - R1 audio (unused)
10 - R1 shield (unused)
11 - +12V
J2 - Speaker Output (6 pins, .100")
1 - Right speaker +ve
2 - Right speaker -ve
3 - Key
4 - Left speaker +ve
5 - N/C
6 - Left speaker -ve
(SW2 = 10-position switch at A13 on 68000 CPU BOARD)
1 2 3 4 5 6 7 8 9 10 Meaning
---------------------------------------------------------------------
On On ( Unused )
Off On ( Unused )
On Off ( Unused )
Off Off ( Unused )
On Free play
Off No free play
On 1 coin per life unit
Off 2 coins per life unit
On 1000 hit points per life unit
Off 2000 hit points per life unit
On Attract mode sounds ON
Off Attract mode sounds OFF
On On Difficulty = Medium
Off On Difficulty = Easy
On Off Difficulty = Hard
Off Off Difficulty = Medium
On ( Unused )
Off ( Unused )
On Freeze Mode
Off Normal game play
Operator-recommended settings are all switches OFF, for no free play,
1 coin per 1000-hit point life unit, attract mode sounds activated,
medium difficulty, and freeze mode off.
