Bally PROFESSIONAL arcade User manual

PROFESSIONAL
Owner's Manual
IMPORTANT
Do not block vents by operating
this unit on acarpeted surface
Heat build up may result in
component failure;
from nsTROvision inc.

(This Page Intenionally Left Blank)

BALLY PROFESSIONAL ARCADE
With the Bally Professional Arcade, you and your friends will en-
joy hours of entertainment. It is equipped with avariety of unique
features including remote game selection, full color graphics, elec-
tronic music and much, much more!
Four programs have been included with your Arcade. Avariety
of exciting Videocade game cartridges are also available which you
can purchase to increase your enjoyment of the Arcade. Or, learn to
make your own games, electronic music and video art with the Bally
Basic Computer Learning Lab.
Published by The Image Producers, Inc.
for
Astrovision, Inc.
6460 Busch Blvd., Suite 215
Columbus, OH 43229
April 1981
Copyright ©1981 Astrovision, Inc.
All Rights Reserved.

CONTENTS PAGE
General Safeguards 4
FCC Regulations 5
Bally Professional Arcade 5
TV/Game Switch Box 6
300OHM Installation 6
750HM Installation 7
Connecting Arcade to TV Receiver 7
Connecting Hand Controls 8
Channel Selector 8
Switching on Arcade and TV ,9
Adjusting TV Screen 9
Arcade Warm Up Instruction 9
Main Menu Selection 9
Hand Control Operation 10
Remote Game Selection 1
1
Television Tube Protection Circuit 12
Pause 12
User-Programmable Game Time 12
Built-in Program Instructions 12
Gunfight 13
Checkmate 14
Scribbling 15
Calculator t15
Inserting Videocade Cartridges 17
In Case of Difficulty !!.'.' 19
GENERAL SAFEGUARDS
1. Do not install the Bally Professional Arcade near heat sources
such as radiators or air ducts, or in aplace subject to direct
sunlight, excessive dust, moisture, mechanical vibration or shock.
2. Allow adequate air circulation under the Arcade to prevent heat
build up. Do not block vents by operating the Arcade on acarpeted
surface.
3. Do not open the Bally Professional Arcade cabinet as it will void
your warranty. There are no user serviceable parts inside.
4. To disconnect the cord, pull it out by the AC adapter housing.
Never pull the cord itself.
5. Save the original shipping carton and packing materials. If you
ever need to ship your set, the original carton will help prevent
damage to your Arcade.

FCC REGULATIONS
Please note the FCC regulations which prohibit the following:
1. The use of additional flat lead in from the TV/game switch box to
your TV receiver.
2. Connecting any additional TV receivers to theTV/game switch box.
3. Connecting the Bally Professional Arcade directly to your TV
antenna or cable TV connector. All connections are to be made
through the TV/game switch box.
Violations of these rules could cause interference to other TV
receivers in your area.
Also see In Case of Difficulty, page 19.
BALLY PROFESSIONAL ARCADE
The following sections describe the procedure for setting up
your Arcade and connecting it to your television set. Please compare
the illustrations to your own system and read the instructions
carefully.
CONSOLE POWER
ADAPTER
OVERLAY FOR
SCRIBBLING
BALLY PROFESSIONAL ARCADE
Figure 1

TV/GAME SWITCH BOX
The TV/game switch box included with your Bally Professional
Arcade enables you to select regular television programming or
Arcade games by simply moving the selector switch to the mode
desired.
By comparing the back of your television set with the following
two illustrations, check to see which set of instructions apply to you.
If you have 300 ohm ribbon type flat lead into the VHF antenna ter-
minals, go to the next section entitled 300 ohm installation. If you
have 75 ohm round coaxial cable into the VHF antenna jack, go to
the following section on 75 ohm installation.
TV/GAME SWITCH BOX
Figure 2
300 OHM INSTALLATION
1. Locate the VHF antenna terminals on the back of your television
receiver. Remove the existing lead in wires connected to these ter-
minals and attach them to the terminals marked "Connect to
Antenna" at the base of the TV/game switch box.
2. Connect the short length of antenna wires coming from the side of
the TV/game switch box to the VHF antenna terminals of your TV
receiver.
300 OHM TWIN LEAD INPUT
Figure 3

75 OHM INSTALLATION
Note: With this system it will be necessary to supply a75 ohm to 300
ohm matching transformer. This can be obtained from your dealer or
any television service center.
1. Remove the coaxial connector from the back of your TV receiver
and connect it to the matching transformer.
2. Connect the 300 ohm flat twin lead (from the matching
transformer) to the terminals marked "Connect to Antenna" at the
base of the TV/game switch box.
3. Connect the short length of the antenna wires coming from the
side of the TV/game switch box to the VHF antenna terminals of
your TV receiver.
75 OHM TERMINAL
(UNUSED)
75 OHM TO 300 OHM
TRANSFORMER
75 OHM COAXIAL CABLE INPUT
Figure 4
CONNECTING ARCADE TO TV RECEIVER
Carefully unroll the coaxial cable from the Arcade console and
plug it into the connector on the TV/game switch box marked GAME.
Then, plug the power adapter into a120 VAC outlet.
HAND CONTROL PLUG-IN
BACK OF ARCADE
Figure 5
TO TV/GAME
SWITCH BOX
TO POWER ADAPTER

CONNECTING HAND CONTROLS
The Bally Professional Arcade comes with two hand controls.
Each one is numbered on the top of its knob to indicate player #1 and
player #2. Additional hand controls may also be purchased for three
and four player games.
Plug each hand control into its appropriate connector on the
back of the Arcade. Hand control #1 should be inserted into the first
jack on the back left side. From left to right (as you face the front of
the Arcade), the jacks connect to players 1, 2, 4, 3, respectively.
CHANNEL SELECTOR
With the Bally Professional Arcade, channel 3or 4on your
television receiver may be used to play the video games. This feature
is important because it minimizes the potential for interference if a
particular channel is active in your area.
To select alocally inactive channel, locate the channel selector
contained in the compartment on the left side panel as you face the
front of the Arcade. Note the position of the switch. If channel 3is in
use in your area, the switch should be set to the channel 4position.
Reset the switch if necessary.
MOVE TO POSITION 4
CHANNEL 3POSITION
CHANNEL SELECTOR
Figure 6

SWITCHING ON ARCADE AND TV
The on/off switch for the Arcade is located on the back left side
of the console. Slide the switch to the left (as you face the front of
the Arcade) to turn on the power.
Once you have selected either channel 3or 4on the Arcade,
switch on your television set and turn to that channel. (Please make
sure the TV/game switch box selector is in the game position.)
ADJUSTING TV SCREEN
If the selected TV channel is not normally used, it may be badly
out of focus; therefore, adjust the fine tuning as follows:
1. If your TV is equipped with an AFC/AFT button, turn it off to
release the automatic fine tuning circuitry. Otherwise, proceed to
step 2.
2. Adjust the fine tuning knob clockwise until aherringbone pattern
appears in the colored parts of the picture. Then, turn the knob
slowly Counter-clockwise. Release it at the point where the
herringbone pattern just disappears and the picture is clear. This
is the correct tuning point.
3. Turn the AFC/AFT button to on in order to reactivate the
automatic fine tuning circuits.
ARCADE WARM-UP INSTRUCTION
During the first few minutes of operating your Bally Profes-
sional Arcade, arandom pattern may appear on your TV screen. If
this occurs, simply press the RESET button to clear it. It may even be
necessary to turn the power switch off then on again to completely
clear the circuit.
Due to sophisticated circuitry operation, this condition may oc-
cur until the unit has reached its stable operating temperature.
MAIN MENU SELECTION
The Bally Professional Arcade comes with aselection of three
video games and a5-function, 10-memory calculator. With these pro-
grams, you can begin using the Arcade as soon as you set it up. After
you have made your connections and your unit has been turned on,
press RESET and the following menu should appear on your screen:
1-GUNFIGHT
2-CHECKMATE
3-CALCULATOR
4-SCRIBBLING

Instructions for playing these games will be provided later in
this manual. Each player will need to have access to ahand control
in order to play the games. In addition, players may choose to use the
remote game selection feature rather than entering numbers on the
keypad.
HAND CONTROL OPERATION
Each hand control is made up of three different parts—aknob,
ajoystick and atrigger. The functions of these parts vary from game
to game.
LEFT
DOWN
RIGHT
8-WAY JOYSTICK
KNOB
TRIGGER
HAND CONTROLS
Figure 7
10

The knob on the top of the hand control can be turned to the left
or to the right. When playing Gunfight, rotation of the knob moves
the position of the gunfighter's hand.
The joystick can be moved in eight directions, such as, forward,
backward, side-to-side and at 45 degree angles. These motions
determine the movement of the image angles; for instance, in
Checkmate, the joystick is used to move your symbol horizontally,
vertically and diagonally.
When the trigger is pulled, aswitch is activated which controls
part of the game action; for example, the trigger is used for shooting
in Gunfight or placing atrace on the screen in Scribbling.
REMOTE GAME SELECTION
The Bally Professional Arcade provides you with the conve-
nience of remote game selection. All of the keypad entries required
to start agame may be made using the hand control connected in the
#1 position.
Remote game selection is easy, and only three steps are involv-
ed. Let's play Checkmate as an example.
1. When the main menu is displayed on the screen, pull the trigger
once. Anumber will appear on the lower left corner of the TV
screen.
2. Turn the knob on the hand control to change the number. Adjust
the knob until the number of the entry you want is shown. For
Checkmate, this number would be 2.
3. Pull the trigger again. This time it will register your choice with the
Bally Professional Arcade.
The Arcade will now ask you to "ENTER #OF GAMES." Press
the trigger once for remote game selection. Adjust the knob to in-
dicate the number of games you wish. Register your choice by press-
ing the trigger.
Now follow the same three step sequence to enter the number
of players.
When agame is over, you may select another game by pulling
the trigger to obtain the main menu. (Note: If you pull the trigger too
quickly, it will erase the final score of the game.) Then, pull the trig-
ger, adjust the knob and pull the trigger again to enter your choices.
11

TELEVISION TUBE PROTECTION CIRCUIT
It has been said that video games may harm your television tube
if left on for excessive periods of time. This is not true of the Bally
Professional Arcade. If left unattended for approximately four
minutes, the Arcade will blank the screen and prevent any burned-in
images. Press any key on the keypad or use the hand control to
resume operation. (Note: There may be occasional exceptions to this
protection circuit feature.)
PAUSE
To pause in the middle of agame, press the clear (C) key to
blank the screen. Press the clear (C) key again to resume at the exact
point at which you blanked the screen. (Note: As with the protection
circuit, there may be occasional exceptions to the pause feature.)
USER-PROGRAMMABLE GAME TIME
You are not limited to aprescribed length of time or fixed scores
when playing the Arcade games. With the use of the keypad, you can
program most games to ascore of 1to 99 or from 1second to 10
minutes in length.
BUILT-IN PROGRAM INSTRUCTIONS
Your Bally Professional Arcade has three built-in games and a
calculator. Please read the following instructions to learn their
operation.
12

GUNFIGHT
Gunfight is avery popular arcade game for two players. You
have complete control over your gunfighter's movements as you at-
tempt to gun down your opponent before he or she gets you. To add
to the fun, different objects appear on the screen between the gun-
fighters. Your gunfighter will be able to hide behind cacti, trees and
even amoving, covered wagon.
Select this game by pressing 1on the keypad or pulling the trig-
ger on hand control #1, turning the knob until 1appears on your TV
screen, then pulling the trigger again. This informs the Arcade that
you wish to play Gunfight.
Then, enter the score to which you would like to play. When play-
ing to ascore of less than 10, you will need to enter an equal sign (=
)
to begin play.
Gunfight utilizes hand controls #1 and #2. The functions of the
hand controls are:
Joystick Walks your gunfighter around the screen.
Knob Raises and lowers his arm.
Trigger Shoots.
At the top of your TV screen, the Arcade will indicate each
player's score and the number of bullets remaining. In addition, a
10-second timer will be shown after either player uses all six bullets.
Each "scoring set" will have different objects appear on the screen.
Aim carefully! You may use up all your bullets by cutting down the
tops of trees!
GUNFIGHT
Figure 8
13

CHECKMATE
The object of Checkmate is to cause your opponent to crash in-
to your trail, his own trail, or the sides of the playing field. Every time
you outlast one of your opponents, you receive one point. For exam-
ple, in agame with four players, the first player to be eliminated
scores zero, and the remaining three score one point each. The next
player eliminated also scores zero, and the remaining two players
each score another point. After all other players have been
eliminated, the remaining player will have scored three points— and
the game is over.
To select Checkmate, press 2on the keypad, or pull the trigger
on hand control #1, turn the knob until 2appears on the screen and
pull the trigger again. You are now ready to play Checkmate.
Then, using the keypad or hand control #1 ,enter the number of
games you wish to play. When playing less than 10 games, you must
press the equal sign (=)to begin play.
Finally, enter the number of players. If you enter 0, the Arcade
plays by itself. If you enter 1, four characters appear and you play
against the Arcade (you control symbol #1). Enter 2, 3or 4and the
corresponding number of symbols will appear.
1+DDfl 3* ddd| dd |4u ODD 2° ODD
i
V
I
+*+*.*
<da
CHECKMATE
Figure 9
In the box at the top of the TV screen, the Arcade shows each
player's number and symbol, as well as the number of games
remaining.
When the game begins, the symbols move automatically. You
can change the direction by using the joysticks to move horizontally,
vertically and diagonally. If you try to move backwards, it's an in-
stant crash! For this game, the knob and trigger have no function.
Akey strategy is to fence off as much of the screen as possible.
That way, your opponent has no choice but to crash into your trail or
his own. Games are fast-paced and exciting—especially with the
great Arcade sounds.
14

SCRIBBLING
Scribbling turns your TV into acolor drawing tablet. You can
have hours of fun with this fascinating, creative game. By
manipulating the various controls, you can create amulti-color pat-
tern on your TV screen and draw or write almost anything you
choose.
Press 4on the keypad (or select 4using remote control) to play
Scribbling. Then, enter 0, 1, 2, 3or 4for the number of people who
wish to play. If you enter 0, the Arcade will draw intricate patterns on
the screen while you watch.
WHITE GREEN RED BLUE
COLOR CHANGE
COLOR CHANGE
»tt
INTENSITY INCREASE
**+
INTENSITY DECREASE
CLEAR
SCRIBBLING OVERLAY
Figure 10
Place the plastic overlay provided with your unit over the
keypad. There are 256 colors obtainable with Scribbling. To change
the color of the picture on your TV, use the keys on the keypad as
follows:
(Top to Bottom, Left to Right)
Top Row Mixes amount of white, green, red, blue.
Second Row Reverses color changes of above.
Third Row Increases intensities.
Fourth Row Decreases intensities.
Fifth Row No function.
Sixth Row First key (clear) clears the screen; all others
have no function.
In addition to the keypad functions, the hand control is used in
the following ways:
Joystick Moves cursor in eight directions.
Knob Increases size of cursor and changes color
from white to green to red to blue.
Trigger Places atrace on the screen as you move the
joystick.
15

CALCULATOR
Not only does the Bally Professional Arcade contain three great
games, but it also has a5-function, 10-memory calculator that will
store and scroll up to 92 entries on your TV screen.
QQQO
MR MS CH *
QQQQ
7891
QQQO
QQQQ
dd66
CE *
QQOO
CALCULATOR FUNCTIONS
Figure 11
To select the calculator, enter 3 on your keypad (or use Hand
Control #1 to select 3by remote control).
You should now see ahorizontal gold bar at the bottom of your
screen. This gold bar is used to display the present entry and answer.
Similar to other calculators, this one allows you to add, sub-
tract, multiply, divide and figure percentages. The keypad functions
for the calculator are:
(C)Clear Key Removes all previous calculations including
memory storage.
(CE) Clear Entry Removes only the last entry from display.
(CH) Change Sign The CH key changes the sign of the displayed
number. Negative numbers will appear in red.
(MS) Memory Store Adds displayed number to memory; 10 individ-
ual entries to memory storage can be made.
Each time the MS key is used, it should be
followed by pressing the appropriate number
key (1, 2, 3, etc.) to select the desired storage
register.
(MR) Memory Recall Recalls number in memory to display. Must be
followed by appropriate number key to secure
correct memory from storage.
(a)Scroll Up Moves video tape forward.
(v)Scroll Down Moves video tape backward.
(.)Decimal Enters adecimal point.
(%)Percentage Calculates apercentage of the previous entry.
16

To learn to use the keypad, enter the following problem:
8+6-5x 16-8 =
After you have solved this problem, continue making entries
until the first few numbers begin to slide off the screen. At this point,
press the scroll backward key(t) until the top digit reappears. Now
press the scroll forward key (4) and return to the point where you
left off.
You can store up to 92 line entries on this problem stack.
Numbers should not be entered when the screen is scrolling up or
down, as those numbers will be omitted. If your problems go over the
92 line limit, numbers at the top of the stack will be lost as new data
is entered.
INSERTING VIDEOCADE CARTRIDGES
Whenever you insert videocade game cartridges into the Ar-
cade, the preceding four programs will generally be the last four
listed on the main menu of games. To load anew cartridge, follow
these instructions:
1
.
Insert the cartridge, label side up, so that the long, open slot faces
into the Arcade.
2. Press the RESET button, and the menu of games will be displayed.
17

This equipment generates and uses radio frequency energy and
if not installed and used properly, that is, in strict accordance with
the manufacturer's instructions, may cause interference to radio
and television reception. It has been type tested and found to comply
with the limits for aClass Bcomputing device in accordance with
the specifications in Subpart Jof part 15 of FCC Rules, which are
designed to provide reasonable protection against such interference
in aresidential installation. However, there is no guarantee that
interference will not occur in aparticular installation. If this equip-
ment does cause interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the
following measures:
1. Reorient the receiving antenna.
2. Relocate the computer with respect to the receiver.
3. Move the computer away from the receiver.
4. Plug the computer into adifferent outlet so that computer and
receiver are on different branch circuits.
If necessary, the user should consult the dealer or an experienc-
ed radio/television technician for additional suggestions. The user
may find the following booklet prepared by the Federal Communica-
tions Commission helpful:
"How to Identify and Resolve Radio-TV Interference Problems."
This booklet is available from the U.S. Government Printing Of-
fice, Washington, D.C. 20402, Stock No. 004-000-00345-4.
BILLING CODE 6712-01-M
"WARNING: This equipment has been certified to comply with the
limits for aClass Bcomputing device, pursuant to Subpart Jof Part
15 of FCC Rules. Only peripherals (computer input/output devices,
terminals, printers, etc.) certified to comply with the Class Blimits
may be attached to this computer. Operation with non-certified
peripherals is likely to result in interference to radio and TV
reception."
18

IN CASE OF DIFFICULTY
Your Bally Arcade has been rigorously tested and thoroughly inspected prior to shipping,
and it is unlikely that you will experience any difficulty with its operation. However, if you
suspect that aproblem exists, the following chart will help you resolve it or determine its
cause. To use the chart, locate the symptoms under the PROBLEM heading, determine what
it might be CAUSED BY, then read and perform the POSSIBLE SOLUTIONS.
PROBLEM —No picture or sound. "Hiss" and "Snow" as if between stations.
CAUSED BY: POSSIBLE SOLUTIONS
a. No outlet Check for a loose connection or no power at the AC outlet. Plug alamp into
power. the same outlet to verify that power is present. Check for bent prongs on
the wall transformer.
b. Improper Verify that the TV/GAME switch box is properly connected to the VHF
antenna antenna terminals on your TV set and that the switch is all the way in the
connection. GAME position. Make sure that the cable has not come loose from the
switch box.
c. Channel switch Ensure that the channel selected on the TV corresponds to the channel
improperly set. switch setting on the Arcade. Try fine-tuning the channel slightly. Also
check to be sure that the channel you have selected is not being broadcast
in your area.
d. Defective power Verify that the ON/OFF power switch on the back of the Arcade operates
supply or RF freely (about 1/4 inch travel) and that it is in the outward-most (ON)
modulator. position. If power is on at the wall receptacle and no change in picture or
sound occurs when the Arcade is switched from OFF to ON, adefect
exists.
PROBLEM —Fuzzy picture or strong interference. Buzzing sound changes with picture.
CAUSED BY: POSSIBLE SOLUTIONS
a. Improper See 1b. Check the antenna wires (outside or rabbit-ears) to make sure they
antenna have been properly connected to the antenna screws on the TV/GAME
connection. switch box. Verify that the 300 ohm VHF antenna input was used when
connecting to your TV set.
b. Channel switch See 1c.
improperly set.
c. RF modulator If tuning in asatisfactory picture results in abuzzing sound that changes
adjustment. with the picture content, asimple adjustment to the RF modulator inside
the Arcade may cure this problem. DO NOT ATTEMPT TO MAKE THIS
OR ANY ADJUSTMENTS TO THE RF MODULATOR. Refer this
adjustment to your authorized service center. Note that asimilar
misalignment in your TV set can also cause this problem.
PROBLEM —Dark screen or random patterns on screen.
CAUSED BY: POSSIBLE SOLUTIONS
a. Low power. Make sure that your Arcade is not connected to an overloaded circuit and
that you are not experiencing a"brown-out" condition or transient line
drop caused by amajor motor driven appliance starting up. Your Arcade
requires asteady power supply of between 108 and 125 volts.
b. Incomplete Your Arcade is designed to reset its internal circuitry and begin BASIC or
RESET. the game menu whenever either the power is turned on or the RESET
button is pressed. Press the RESET button again to clear an incomplete
reset operation.
c. Defective game Agame cartridge can become defective when contacting unusually strong
cartridge or static discharge, such as handling the cartridge on anew carpet in very dry
BASIC System weather. Ensure that the cartridge is firmly inserted, then press RESET. If
cartridge. it still does not work, try another cartridge to make sure the Arcade is
functioning properly.
d. Temperature If the problem occurs after alength of operation, the problem may be due
build-up or to excessive temperature build-up around sensitive internal components,
internal Turn off your Arcade and try it again after it has cooled down (10-15
failure. minutes). Also, an internal component may have become intermittent with
use. Refer these problems to your authorized service center for correction.
PROBLEM —Game or BASIC cartridge won't run or partially runs only.
CAUSED BY: POSSIBLE SOLUTIONS
a. Low power. See 3a.
b. Defective See 3c.
cartridge.
c. Temperature See 3d.
build-up or
internal
failure.
19

PROBLEM —Hand control erratic or inoperative.
CAUSED BY:
a. Low power.
b. Defective
hand control.
c. Dirty control
.Defective hand
control jack.
e. Game design
PROBLEM
POSSIBLE SOLUTIONS
See 3a.
Make sure that the hand control is fully connected to the appropriate jack.
Try another hand control in the same jack. Check the cord connections for
excessive strain or alimp feeling. Test the hand control functions, using a
simple BASIC program to PRINT KN(), JY(), TR().
Dust or dirt may collect on the contact surfaces of the knob and trigger. A
dirty knob usually causes ajittery response from the hand control. Attach
the control to the furthest left jack (#1) and attempt to make amenu
selection. If each pulling of the trigger does not cause one step (i.e. from
number selection to number recording to number selection, etc.), then the
trigger requires cleaning. While using the knob to select the numbers, it
should not exhibit excessive flickering between numbers and should easily
come to rest at the desired number. If you have trouble selecting numbers,
the knob control requires cleaning.
THE HAND CONTROL JACKS ARE SUSCEPTIBLE TO STATIC
DISCHARGE. —See 3c. Static discharge can damage the hand control
jack and cause erratic operation or complete failure of the jack (socket
connection). Try different controls in the problem socket to distinguish
between ahand control failure and afailure of the connecting jack.
Certain games, as aby-product of their design, seem at times to favor one
control jack over another. For example, inputs from hand control #1 may be
processed before inputs from hand control #2. The effect of such designs
may cause the #1 control to "feel more responsive" when in direct
competition situations. This slight difference may be used as ahandicap
where the games do not otherwise have selectable skill levels.
Keypad erratic or inoperative.
POSSIBLE SOLUTIONS
Like the hand controls, the keypad contacts can exhibit erratic behavior.
Make sure that the keys are pressed completely and firmly. This not only
provides abetter electrical contact but helps keep the contacts clean.
See 5d. The same keypad is electrically connected to some of the same
circuitry as the connecting jacks. Damage to the jacks can cause erratic
keypad operation, such as displaying unwanted entries from the furthest
right column of keys. Check keypad operation with the hand controls
removed and then check for non-functional connecting jacks.
PROBLEM —Programs will not load using the BASIC tape interface.
POSSIBLE SOLUTIONS
Most cassette tape recorders contain circuitry which controls the record
volume to keep it at optimum level. If your recorder does not have such a
feature, make sure that your recorder level is properly set. The proper
level is just below the point of distortion. Playback level should be fairly
loud—about two-thirds full volume is sufficient. Louder levels may be
required if the tape was recorded on adifferent tape recorder. This is due
to losses which can occur because of alignment differences between the
two recorders.
Verify that the interface cord between the BASIC System cartridge and the
recorder is connected to the proper jack on the recorder: MIC for
recording; EAR for loading. The plug cord should be properly connected at
both ends. Check the cord by plugging it into another sound system to
make sure it is working properly.
While this interface is designed to be tolerant of playback flutter/wow (up
to +25%) and certain amounts of amplitude variations, extreme variations
and even drop-outs can occur when using old or low quality tape. If in
doubt, record along period of asteady tone and then listen to the playback.
Defects in either the tape or the recorder will be obvious.
CAUSED BY:
a. Keys not
completely
pressed.
b. Defective
hand control
jack.
CAUSED BY:
a. Record /play-
back volume
too low.
.Interface
connection.
Defective tape
or recorder.
20