Star Tech Journal

Issue: 1981-December - Vol 3 Issue 10

S*TJ DECEMBER 1981 18
EXIDY
MONITOR
* ADJUSTMENT *
PROCEDURE
To Freeze Picture For Monitor Adjustment
If you have to adjust the color on your
monitor or make other adjustments, you
may wish to "freeze" the picture. The
easiest way to do this is to activate one
of the coin switches. While the switch is
activated, the picture will "freeze" on
the screen, and as long as you hold down
the coin switch it will remain frozen.
Another way of doing this is to jump
the switch terminals together or remove
either of the wires and place it on the
empty terminal. Do your adjustments
and then disengage your coin switch.
COIN DOOR
- 0
0
0
0
'---
0
0
COIN SWITCH
SWITCH TERMINALS
Checking Voltages on Exidy "Venture"
One of the first things
to check when you have
a problem is your
voltage. A good place
to check for all your
voltages is at the con-
nector P-5 on the
Audio/Color board.
The voltages should be
shown at right with
connector connected to
the audio/color board.
P-5
1
GND
2
+12vdcHI
-12vdc HI
-12vdc LO
-5vdc
+ 12vdc LO
SPKR(A)
3
4
5
6
7
+5vdc
SPKR(B)
8
9
10
11
12
13
14
15
EXIDY
The traces on the audio color board
connect 2 pins each from the connector
so that you have the same voltages at:
pin 1 & 15
gnd
2& 14
+ 12vdc HI
3 & 13
-12vdc HI
4 & 12
-12vdc LO
5 & 11
-5vdc
6 & 10
+ 12vdc LO
7 & 9
Speaker (A) and (B)
8
+ 5vdc
l
* "MOUSETRAP" * SPECIAL * DEVICE * NOTES
Exidy "Mousetrap": Microprocessor On Logic Board
"Mousetrap" uses two microprocessors on the
audio board (a 6502 and a Z-80) and one
microprocessor on the logic board (a 6502A).
The logic board must use a 6502A otherwise
it will not operate correctly. On the audio
board any 6502 will suffice.
Example:
2114-25
Exidy "Mousetrap": 2114 Logic Rams
The logic board on "Mousetrap" uses (8) 2114
RAMs. The speed of these RAMs must be
300 nanoseconds or less or the system will
not operate correctly. The way to identify how
fast these are is to look at the number
following the 2114 marking.
2114-25 means the speed of this RAM is
250 nanoseconds.
If you have any questions concerning this
information, call Exidy Customer Service at
(800) 538-8402 or (408) 734-9410.
COURTESY OF EXIDY'S TECHNICAL NEWSLETTER " ZERO DOWNTIME"
S*TJ DECEMBER 1981 19
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MARCH '81
Midway "Galaxian" Substitute +5v Regulator• Atari
"Battlezone" Control Handle Mod • Gottlieb New
System 80 Service Manual • Midway "Pac-Man"
Ram/Rom Location Code • Atari "Missile Command"
Power Interrupt Mod • Atari "Battlezone" Random
Score Problem • Gottlieb Auxiliary Lamp Driver
Board • Microprocessor Troubleshooting (Part 3) •
Midway "Pac-Man" Degree of Difficulty Mod • Atari
"Battlezone" Aux PCB Mod • Stern "Berzerk" Service
Notes • Cinematronics "Star Castle" V3 Roms •
Atari "Asteroids" Switch Maintenance • Rowe/AMI
Turntable Maintenance Tips
APRIL '81
Midway"Rally·X"Test Mode• "Big Computer" in one
chip • Seeburg "SMC 1," "SMC 2" Potential SPKR
Damage • Williams General Illumination Mod •
Midway "Rally-X" Monitor Fuse Rating • Midway
"Pac-Man" Cocktail Table Static PCB • Early Warning
(Field Maintenance Tips) • Rowe/AMI Number
Conversions • Exidy "SPECTAR" Program Update
Mod (11 A-1 to 11 A-2) • Williams C8363 Master
Display Board Troubleshooting Procedures • HVL
Circuits - Atari "Missile Command" Color Monitors
MAY '81
Williams Service Notes • Midway "Rally-X" Static
PCB • Centuri "Phoenix" Options • Exidy Color
Board Ribbon Cables • Updating Older Rowe/AMI
Phonos to Contemporary Prices • Midway "Pac-
Man" Joystick Modification • Signature Analysis
(Part 1) • Atari "Missile Command" Diagnostic Tests
• Rowe Bill Changer Modifications • Gottlieb Coil
Chart
JUNE '81
"Repair of Rock·Ola Dollar Bill Programmers" •
Midway "Galaxian", "Pac-Man" Substitute +5VDC
Power Transistor • Centuri "Phoenix Modifications
• Midway "Garf" Program Change • Early Warning
#2 (Field Maintenance Tips) • Signature Analysis
(Part 2) • Stern "Berzerk" Credit Accumulation Check·
list • Stern "Berzerk" Joystick Mod Kit • Suggested
Game Improvements • Color to B&W Converter CKT
• Texas Instruments PowerSemiconductorCatalogs
JULY '81
Atari "Asteroids Deluxe" Program Change Kit • Stern
"Berzerk" Joystick Adjustment • Rowe 44 7 Product
Price Upgrading • Stern "Scramble" Power Supply
Modification • Germlin "Astra Blaster" Audio Modifi-
cation • Wiring Diagram for Wico Manual/Remote
Volume Control • Gottlieb Reset Modification •
Taito "Crazy Climber" Joysticks • Signature Analysis
(Part 3) • Williams "Defender'' System Summary •
Midway "Pac-Man", "Rally-X" & "Garf" Anti-Static
Cleaner Application • Williams "Black Knight" Service
Notes • Loss of All Coils on Bally Pins • Atari
"Asteroids" Troubleshooting Tips • Stern Joystick
PCB Troubleshooting Tips
AUGUST '81
Midway "Garf" Mission Self Test • Updating Older
"SHP" Seeburg Amps • Bally MPU Screening Error
• Lost and Found Bally Flippers • Midway "Rally-X"
Ram Test Message Code• Stern "Scramble" Joystick
Notes • Atari Service Notes ("Centipede", "Battle·
zone", "Warlords", "Asteroid Deluxe", "Asteroids") •
Bally "Fireball II" Clamping Diode • Game-A-Tron
"Space Bugger" CPU Modification • Bally "Fireball
11" Fuse Modification • Early Warnings No. 3 •
Signature Analysis (Part 4) • Exidy Service Notes •
Gottlieb Display Problems• Baily's Tech Quiz Part 1
• Midway "Pac-Man" & "Rally-X" Brightness Adjust-
ment• Atari "Asteroid Deluxe" New Program Feature
• Centuri "Phoenix" Upright Modification
_________________
1
SEPTEMBER '81
Midway General Illumination • Bally 7 Digit MPU
Modification • "Hot" Centuri Service Tip • Midway
"Wizard of War" Maze Test • Exidy "Targ" and
"Spectar" Audio Amps • Baily's Tech Quiz (Part 2) •
Modification of One Coin-One Play Machine into Two
Coins-One Play Machine • Williams "Defender'' Notes
• Midway Card Rack System Compatibility • Stern
"Berzerk" Handle Assembly • Midway"Omega Race"
Features • Wico Joystick Report • Exidy "Venture"
Program Change • Gremlin "Space Fury" Cabinet
Notes • Gottlieb System 80 Sound/Speech Board •
Seeburg Price-Setting Instructions (Part 1)
OCTOBER '81
Midway "Omega Race" Troubleshooting Guide •
Centuri "Phoenix" Credit Mod • Stern "Berzerk"
Alternate Joystick • Exidy "Venture" Audio Diagnostic
Test• Bally'sTechQuiz(Part3) • CoincoDoorNotes
• 2nd Annual S*TJ Reader Survey• Bally Rectifier
Board Fuse Change • Atari "Centipede" - Potential
Shock Hazard • Stern "Super Cobra" Pwr Supply
Mod • Stern "Super Cobra" Logic System ID •
Seeburg Price-Setting Instructions (Part 2)
NOVEMBER '81
Atari "Centipede" Track-Ball Mod • Bally "Centaur''
Service Notes • Exidy "Venture" Joystick • Atari
"Tempest" Service Documentation • Midway "Pac·
Man", "Rally-X" and "Galaxian" Coin Door Mod •
Stern "Super Cobra" Garbled Sound Mod • Seeburg
Price-Setting Instructions (Part 3) • Midway"Omega
Race" Dip Switch Setting • Midway "Omega Race",
"Wizard of War" and "Pac-Man" Display Glass •
Gremlin/Sega "Space Fury" Color (G·80) X·Y System
Redesign • Interfacing Dynamic 4027 Rams to the
Z80 • Taito "Moon Shuttle" Program Change •
Baily's Tech Quiz (Part 4)
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