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

6.
DIGITAL CIRCUIT
BLOCK DIAGRAM
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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.
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