— 6 —
CPU (LSI4: GT913F)
The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.
The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from
the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with
the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the
CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores
sequencer data into the working storage RAM.
The following table shows the pin functions of LSI4.
.
o
N
n
i
P
l
a
n
i
m
r
e
T
t
u
O
/
n
I
n
o
i
t
c
n
u
F
1
0
D
X
T
t
u
O
t
u
p
t
u
o
l
a
n
g
i
s
I
D
I
M
2
0
D
X
R
n
I
t
u
p
n
i
l
a
n
g
i
s
I
D
I
M
3
0
K
C
S
t
u
O
t
u
p
t
u
o
l
a
n
g
i
s
)
F
F
O
r
e
w
o
P
o
t
u
A
;
O
P
A
(
R
E
W
O
P
4
1
D
X
T
—
.
d
n
u
o
r
g
o
t
d
e
t
c
e
n
n
o
C
.
d
e
s
u
t
o
N
5
1
D
X
R
n
I
t
u
p
n
i
l
a
n
g
i
s
N
O
r
e
w
o
P
6
1
K
C
S
t
u
O
t
u
p
t
u
o
e
s
l
u
p
g
n
i
z
i
n
o
r
h
c
n
y
s
Z
H
M
1
9
~
7
,
0
N
A
,
C
C
V
A
1
N
A
—
.
d
n
u
o
r
g
o
t
d
e
t
c
e
n
n
o
C
.
d
e
s
u
t
o
N
0
1
D
N
G
A
n
I
e
c
r
u
o
s
)
V
0
(
d
n
u
o
r
G
1
1
K
C
B
t
u
O
t
u
p
t
u
o
k
c
o
l
c
t
i
B
2
1
O
S
t
u
O
t
u
p
t
u
o
a
t
a
d
d
n
u
o
s
l
a
i
r
e
S
3
1
K
C
R
L
t
u
O
t
u
p
t
u
o
k
c
o
l
c
d
r
o
W
4
1
D
N
G
n
I
e
c
r
u
o
s
)
V
0
(
d
n
u
o
r
G
6
1
,
5
1
1
T
L
X
,
0
T
L
X
t
u
O
/
n
I
t
u
p
t
u
o
/
t
u
p
n
i
k
c
o
l
c
z
H
M
4
2
7
1
C
C
V
n
I
e
c
r
u
o
s
V
5
+
9
1
,
8
1
1
D
O
M
,
0
D
O
M
n
I
.
d
n
u
o
r
g
o
t
d
e
t
c
e
n
n
o
C
.
l
a
n
i
m
r
e
t
n
o
i
t
c
e
l
e
s
e
d
o
M
0
2
B
T
S
R
n
I
t
u
p
n
i
l
a
n
g
i
s
t
e
s
e
R
1
2
I
M
N
n
I
t
u
p
n
i
l
a
n
g
i
s
N
O
r
e
w
o
P
2
2
T
N
I
—
d
n
u
o
r
g
o
t
d
e
t
c
e
n
n
o
C
0
3
~
3
2
3
I
F
~
0
I
F
3
I
S
~
0
I
S
n
I
l
a
n
g
i
s
t
u
p
n
i
y
e
k
r
o
f
l
a
n
i
m
r
e
T
8
3
~
1
3
7
C
K
~
0
C
K
t
u
O
l
a
n
g
i
s
n
a
c
s
y
e
k
r
o
f
l
a
n
i
m
r
e
T
2
5
~
9
3
0
1
I
F
~
4
I
F
0
1
I
S
~
4
I
S
n
I
l
a
n
g
i
s
t
u
p
n
i
y
e
k
r
o
f
l
a
n
i
m
r
e
T
5
5
~
3
5
2
I
K
~
0
I
K
n
I
l
a
n
g
i
s
t
u
p
n
i
n
o
t
t
u
b
r
o
f
l
a
n
i
m
r
e
T
6
5
B
N
W
M
t
u
O
P
S
D
e
h
t
r
o
f
l
a
n
g
i
s
e
l
b
a
n
e
e
t
i
r
W
6
7
~
7
5
9
1
A
M
~
0
A
M
t
u
O
s
u
b
s
s
e
r
d
d
A
7
7
0
B
S
C
M
t
u
O
M
O
R
e
c
r
u
o
s
d
n
u
o
s
e
h
t
r
o
f
t
u
p
t
u
o
l
a
n
g
i
s
e
l
b
a
n
e
p
i
h
C
8
7
1
B
S
C
M
t
u
O
d
e
s
u
t
o
N
9
7
2
B
S
C
M
t
u
O
P
S
D
e
h
t
r
o
f
t
u
p
t
u
o
l
a
n
g
i
s
e
l
b
a
n
e
p
i
h
C
0
8
C
C
V
n
I
e
c
r
u
o
s
V
5
+
1
8
D
N
G
n
I
e
c
r
u
o
s
)
V
0
(
d
n
u
o
r
G
2
8
B
D
R
M
t
u
O
M
O
R
e
c
r
u
o
s
d
n
u
o
s
e
h
t
r
o
f
t
u
p
t
u
o
l
a
n
g
i
s
e
l
b
a
n
e
d
a
e
R
8
9
~
3
8
5
1
D
M
~
0
D
M
t
u
O
/
n
I
s
u
b
a
t
a
D
9
9
E
L
P
n
I
l
a
n
i
m
r
e
t
e
h
t
,
r
o
t
p
a
d
a
C
A
n
a
y
b
d
e
r
e
w
o
p
s
i
d
r
a
o
b
y
e
k
e
h
t
n
e
h
W
l
a
n
g
i
s
f
f
o
r
e
w
o
p
o
t
u
a
d
n
e
s
t
o
n
s
e
o
d
U
P
C
e
h
t
t
a
h
t
o
s
t
l
o
v
0
s
e
m
o
c
e
b
.
t
i
u
c
r
i
c
y
l
p
p
u
s
r
e
w
o
p
e
h
t
o
t
0
0
1
7
1
P
n
I
t
u
p
n
i
l
a
d
e
P
Содержание CPS-85
Страница 13: ...13 SCHEMATIC DIAGRAMS Main PCB JCM423 MA1M 1 2 8 7 6 5 3 4...
Страница 14: ...14 Sub PCBs JCM423 MA2M MA3M MA4M 10 9...
Страница 15: ...15 Console PCBs JCM423 CN1M CN2 CN3M...
Страница 16: ...16 Keyboard PCB JCM886T KY1M...
Страница 17: ...17 Keyboard PCB JCM886T KY2M...
Страница 18: ...18 Keyboard PCB JCM886T KY3M...
Страница 20: ...20 35 33 35 31 30 34 32 SP 2...
Страница 24: ...8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 Japan Telephone 03 3347 4926 MA0700571A...
