Panasonic KX-W1500

5.2 CPU and Control Circuit
5.2.1 General Description
This
block
consists
mainly
of
the
CPU
(IC18),
ROMS
(ICQ,
IC11,
1C12),
RAM
(IC7,
IC8,
IC10,
1C15,
IC16),
Gate
Arrays
(IC3,
1C19),
and
LSI
(IC1,
1C23).
The
CPU
receives
key
data
from
the
keyboard
and
signals
from
various
sensors
and
function
switches.
Then
the
CPU
controls
the
CRT
and
FDD
by
control
signals
through
the
Gate
Array
(IC3,
1C19),
LSI
(IC1,
1023).
The
CPU
then
controls
the
Daisywheel,
Paper
Feed,
Carrier
Spacing,
Ribbon
Feed
motors
and
the
Hammer
Sole-
noid
by
control
signals
through
Driver
{C
(IC20,
IC21,
IC22).
Block Diagram
Ico
IC4 1C5
104
IC16
1C15
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CPU Gate Array
chip
Rese. select
WR
1C19
Address Bus
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