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The
keysof Keyboard
B
"write"
on the
screen according
to thewhite
arrowheadsonthe keyboard (Fig. 15).
To
form
an interesting
pattern, press "Clear" key,
then A2, B215
times,
B6once,
and
then
BO.
The memorystores upto 130
key entriesor"moves". After
130
moves,
the
computerauto'
matically starts
to repeatthe pattern.
For 129orfewermoves.
Key
BO must
be pressedtostart the
repeatcycle.
KEYBOARD
A
KEYBOARD
B
f
aha
I
nan
;
a
l
B StudioII
©
CLEAR
KEY#0
STARTS
COMPUTER
PATTERN
Figure
15.
Keyboard "B"
Moves Spot
According to
White
Arrowheads
on
Panel
"Doodles"
Function
Press
"Clear"
key. PressA1
.
Single
dotappearson screen
at
lower
left
corner. Use keys
on Keyboard Bto move spot
according
towhite arrows
on panel (Fig.
16).
Key
B5
leaves
a
trail
as player "writes"
with Keyboard
B.
Pressing
Key BO
leaves no
trail. Retrace
stepstoerase lines already written.
Figure
16. In"Doodles",etch
a
sketch
electronically withthe
"B"keyboard
KeyboardTests
If "Tester I"
cartridge is
available, use
it
to
isolate
keyboard
malfunction.
IfTester I is
unavailable,
the keyboards
can be
tested usingthe
built-in
"Addition"game:
Step
1 : Punch
up
"Addition"
game (Key
A5).
Soundswitch
must be"on".
Step
2:
Whenthe
three-digit
numberappears
on screen,
enter
a
series of
wronganswers,
beginning
withA1
.
Aseach
button ispressed, the
beepersounds,
indicating
the
particular
button isoperational. The
beeper sounds
only
duringthe
five
secondsthatthe
random-order
display
is
on
screen.
Usually,
theentire keyboard
can
be
checkedduringthe
five-second
display. If
any
key
fails
to
sound,that
key is
faulty andthe
entire keyboard
should
be
replaced.
am
ana
13D
KEY
#5START
PLAYERA
ENTERS
Q
\___
r\~~.
\
io ni
B
o\po
DDD
DDD
a
Studio11
DDD
DDDD
DDD
<
©
CLEARI
^
—
—.
—
PLAYER
B
]
ENTERS
'
SUM
Figure 17.
Using"Addition"toCheck Keyboards
"Double-Hit"
KeyboardComplaints
Some
early
production units (Serial Nos. 37125andlower)
occasionally
exhibit
a
keyboard malfunctiontermed "double-
hit"
whenStudio II operates in the"Patterns" mode (un-
wanted
dotsappearon thescreen,
andthe
beepersounds
twicefor
onlyone keyentry). Theonly remedy
for
double
hits is
keyboard replacement.
Coaxial CableTests
The
coaxial
cablecarries
modulated RFfrom
theconsole
and DCfrom
the power
unit.
Use
an
ohmmetertotest the
cable
fromthe plugend (Fig.
1
8).
Agood
cable
measures 5
to
*J
J
CABLE CONNECTOR
I—
/©n
—
OHMMETER
N
Z>««">
s~^
I
I
I
4-
""J
Figure
18. CheckingContinuity
ofCo-axCable
8