Roland S-10 - Page 7

DEC. 1986
CIRCUIT
DESCRIPTIONS
USSilSR
1.
CPU
Main
Board IC25 8032
Major Tasks of the
CPU;
.
Keyboard
Reading
Transfers the
velocity
curve data to IC36
(SRAM
HM61 16).
The key
scanner
IC37
(63H149) refers
to
this table
for
determining
a
key dynamics and writes
it into
1C36
together
with the
key number
and the
key
event (on
or off). The CPU
reads
these data
through
IC37.
.
LED
lighting,
LCD
driving,
A/D conversion
BENDER CV,
RANGE, MOD
on/off), IC27 (work-
ing RAM)
reading/writing.
. 1C10
(Sampling 1C)
reading/writing
.
MIDI
transmitting/receiving
.
Rotary
encoder
reading
l.CPU.X'f
K
IC25
8032A
C P Ufi I C3
6
(
SRAM HM6
1 1
6
)
-^-<
0
-Vt" T
•
tl-y
4--X++
h
T
UT
IC37
63H149(iCro
+
?
-.y
C0(lliro4-—
tf
^
X.
ty^
+—
•
iCRAM
IC3 6
„
CPU(iCtl6(D
-
k
r
XT
^iiUTi5c7y.fis-To
•
LED^Iarj.
LCDli®,
AD^jtC
BENDER CV,
RANGE,
MOD
ON/OFF),
7
-
+
X
RAM
I
C
2 7
•
-tX7°yx^'"IC
IC10(RF5C36)
-vcD#iA
/
fi/iiTy.
tij (y
•
MIDI
• a
—
ij
X
X
3
—
—
COic-AjATr
Fig.
1
(2.
A7-A0 DC2-DC0
DA11-DA0
Dll DIO
RS
LCE
LC7-LC0
-OUTO
S-10
2.
I/O
Gate Array Main Board IC23 62H195
Most
of addressing
for
I/O's
and memories and
some
of
the
functions
are
done
through
I/O
gate
array
IC23.
Shown below are
the address map to
be
set by
62H195
and the
block diagram of 62H195.
(Fig.
1
)
3.
Sampling
1C
Main
Board
IC10
RF5C36
The
Roland
custom IC
RF5C36 plays a
key
role
in
the sampling
system. The process
is
illustrated
mainly
with
the aid of
photos, diagrams
and
charts.
NOTE
(See
Fig.
2)
The system
clock
for
the
sampling
system is
based on
the Xtal
connected across IC10
pins
70 and 71.
Left
under an unstable condition, XI
will
sometimes cause
TP7
(RAS) to
be kept high.
This
problem will be
found
on ealier products.
This
can be solved by
add-
ing
10PF
(C32)
across
main board IC10
pin 71
and
the ground point.
2.l/0-5"-h7^H'
XO.K-K IC23
62H195
±ieo:) I / o
fo
T C7V
^
y
CO
T K
X x
<D|§:/£T'»jfFco
I /OY-
h
T XT
titlt-to 62H195
COytiy^Y'i-YYyAioJiY
r
K
xx^-;-
(Fig.l)
3.-tf>7°U
'X'?
ICIO
RF5C38
-y-xx°y
x/'-'i
c
L fzlipY- y
comicom.
'¥M.
^
-
i~o
Y'yy°')
x/' -XXt Aco-xx-r
A/'D
y
ICIO
t°x7
0,
7
I
X
1
(cat-o'i^Tlg
/LLtt-o
C
CO
Xtal
Lq]g§/)ST^($:/iI'j:±i^TP7
(RAS)
Y
H ic
7f
-y
/:
S i i /t 0 S
-r
<=
:(yjJ5iSiS7?
yY>YC32
lOPF/inClO
t”X71
i/'"7
X
* h
(Fig. 2
)