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10.1
G
OVERLAY
ADJUSTMENT
1.
Connect
the measuring
equipment
outlined
in
Fig.
10-2
to
PX-7.
2.
Set the
monitor
TV
to
RGB
input.
3.
Switch the
PX-7 power
on,
and
then with the
initial
message
on
display
(see
Fig.
10-3) press
the return key.
4.
When
the
next message
is
displayed
(see Fig.
10-4),
press
[1]
to
select
MSX+P-BASIC.
5.
Connect
a
digital
voltmeter to
TP-3.
6.
Run
the sample
program
given
in Fig.
10-5
for
output of
color bars
on
the
TV
screen.
7.
Turn
VR104
fully
clockwise.
8.
Adjust
VR103
to
obtain the green color bar
arrangement
shown
in
Fig.
10-6.
9.
Then
slowly turn
VR103
counter
clockwise,
and
record the
TP-3
voltage
A
when
noise
becomes
apparent
in
the
bars.
10.
Next
turn
VR103
slowly clockwise,
and
again
record the
TP-3
voltage
B
when
noise
becomes
apparent
in
the
bars.
11. Finally
adjust
VR103
to
obtain the
TP-3
voltage
which
is
half
way
between
voltages
A
and
B.
P-BASIC
Version
jl.lj
Copyright
1985 by
PIONEER
***
BASIC
MODE
SELECT
***
[1]
MSX
BASIC
+ P-BASIC
[2]
MSX8ASIC
PUSH
[1)
or
[21
(White
characters
on
blue background)
Fig.
10-4
Message
2
10
REM
20
SCREEN
2:
COLOR, 0
,
0
:
CLS
30
FOR X=0 TO
255
STEP
16
40.
LINE
(X, 95)
—
(X+15),
191),
X/16,
BF
50
NEXT
X
60
FOR
X=0
TO
255
STEP
16
70
LINE
(X,C0
—
(X+1,
95),
X/16,
BF
80
NEXT X
90
GOTO
90
Fig.
10-5
Sample
program
Fig.
10-6
G
overlay
adjustment
MSX
system
virsionfj.o]
Copyright
1983 by
Microsoft
(White
characters
on
blue
background)
Fig.
10-3 Message
1
43
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