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6-4-3
Signals
System
chart
of
Timing
system
each
signals
timing
is
in
IC42
inputted
through
QA,
QB...QH.
explanation
made.
The
general
is
method
explained
IC42
(1)
CHRCK
(40ch:
The
signal
to
set
block
and
video
CRTC
is
used
and
of
IC42
QC
QG.
IC45
(2)
(40ch:
LOAD
the
used
for
is
LOAD
character
display
to
information
and
colour
CRTC
versed
signal
of
LOAD,
synchronious
of
the
character
HD74LSl66P).
40
characters
The
signal
for
for
80
characters
one
GRENBLE
(40ch:
(3)
control
The
signal
to
generator),and
also
and
character
signal
output
of
composed
output
QH
(4)
CAS¢l
(IC28
8_§in)
The
give
CAS
signal
to
period
(period
the
display
data
latch
the
display
IC42.
(5)
CAS¢2
(IC46
l3_pin)
The
give
CAS
signal
to
of
when
E
signal
MPU
control
of
the
Output
of
IC42.
and
output
QD
Pin)
(6)
RAS
(IC46
l
basic
The
signal
for
switch
of
the
address.
RAM
(7)
MPU
DISPSW
(IC46
Of
the
U09
SlQn3lS_t
IC42
outputs.
All manuals and user guides at all-guides.com
Circuits
Generating
signal
generating
6-9.
is
in
Fig.
charts
shifted
clock
by
generator
combining
these
By
each
of
system
in
below.
IC35
5
Pin,
8Och:
the
number
of
display
block.
signal
generating
for
80
characters,
IC35
6
Pin,
8Och:
latch
the
data
clock
to
for
unit.
Also,
used
display
character
to
is
used
signal
LOAD
load
parallel
is
composed
and
is
from
QG.
QF
8Och:
IC42
13
Pin,
the
input
signal
to
the
overlap
to
prevent
output.
generator
characters
of
and
80
IC42,
(column
address
signal
when
signal
E
is
from
RAM
and
composed
the
signal
to
RAM
is
H).
Also
used
as
in
and
data
store
RAM
the
RAS
(Row
Address
Composed
of
output
Pin)
4
thg
make
address
RAM
in
is
written
circuit
MHZ)
signal
(l.008
E
l6.l28
then
MCK,
signals,
system
output
and
their
signal
8
Pin)
characters
by
inputting
40
characters,
For
is
the
signal
composed
6
Pin)
and
from
RAM
store
clock
latch
the
to
unit.
Further,
switch
the
mode
for
bit
shift
register
8
of
and
of
QD
QH
output
10
Pin)
IC34
(output
the
Enable
pin
of
the
of
the
output
for
The
s-gnal
if
and
from
QC
of
RAM)
to
signal
is
L).
Used
of
MPU
as
of
output
QB,
(during
during
MPU
period
for
control
signal
a
colour
RAM.
Composed
Signal)
of
RAM.
Also,
and
of
RC
QG
QA,
change,
composed
of
6-8
and
Fig.
is
which
outputted
signals
are
generating
to
output
of
and
QC
colour
RAM
from
the
data
the
re-
of
each
(IC
117
IC42
and
of
graphic
graphic
is
character
40
QG.
the
during
RAM
clock
to
a
of
and
QE
QG
the
time
the
Input/
of
E
signal
for
the
used
IC42.
and
of
QG
QB
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