Sub Rams - Casio CZ-1 Service Manual And Spare Parts List

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6.
DIGITAL CIRCUIT
BLOCK DIAGRAM
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LSI
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CZ-1 employtiive
control LSIt
for
quick
processing.
(1)
K
lin
CPU
Block
The
block
mainly
controls operation of the
digital circuits.
Main
CPU
Controls
keys,
switch scanning,
memory
devices
and MIDI,
ap
Main
ROM
Contains
program
for
system
execution.
_
^Main
RAM
Has
work
aresrfbr
system execution
and
stores
operation
memories and
tone
name
data.
Key
interface
LSI
...
.
A
buffer for data
communication between
CPU
and
Key
touch
control LSI.
Key
touch
control LSI
.
.
.
Detects
key
entry
and
initial
key touch
speed.
(2)
Sub
CPU
Block
The
block
mainly
controls
music
LSts.
Sub
CPU
Controls
music
LSIs
and
memory
devices.
Sub
ROM
Contains
program
for
system execution
and
data
for preset tones.
Sub
RAM
(1)
... Stores data area
for
created
sound.
Sub
RAM
(2)
...
Work
area for
system
execution.
Music LSIs
Refer to page 42.
(3)
CPU
Interface
LSI
.
. .
Interfaces
between Main
CPU
and Sub CPU.
-17-

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