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In
this
RAM
case,
for
the
low
same
display,
l
piece
ifit
is
regarded
so
column
address
the
described
in
table
6-5-2
Colour
RAM
Semi
graphic
colour
This
requires
to
time.
the
For
same
has
the
RAM,
system
the
combination
shows
bit.
this
5
RAM
By
vertical
direction
cified.
In
Level-3,
of
the
read/write
because
The
general
concept
colour
register
The
write
and
to
MPU,
I/O
direction
each
The
address
common
becomes
valid
RAM
Following
store
RAM.
(1)
Period
Display
data
is
Display
sent
store
RAM
and
colour
(2)
M P U RAM
connect
when
MPU
read
the
via
data
bus
MPU
taken
the
colour
to
If
write
the
MPU
the
RAM.
At
same
colour
RAM.
Colour
(3)
register
When
is
stored
program
bit
mask
ROM
one
display
data
or
program.
will
be
not
destroyed
If
is
recording
done
is
kept
register
even
information
of
the
operation.
used
the
mode
page
changing
address
by
display
address
of
the
column
address
one
as
CAS
signal
same.
6-lO.
circuit
is
in
method
use
read
the
characters
besides
this
reason,
5bit
another
16K
x
of
the
displayed
5
bit,
the
colour
unit
1/8
character
bi-directional
different
of
is
6-20.
fig.
as
per
is
bi-directional
and
used
for
read/write
piece
of
three
one
allocated
for
are
when
the
only
registers
is
the
general
data
bus
through
RAM.
period
display
the
area,
then
address
data
which
register.
data
display
area,
time,
the
content
Bit
Mask
store
RAM
of
of
the
colour
register
this
method,
By
if
read
the
MPU
with
"H"
level
ifstore
is
read.
RAM
is
taken
address
(other
display
address
column
address.
In
1
clock
MPU
per
equaling
by
of
address
output
display
colour
to
data
and
colour
graphic
Standard
32K
Byte
colour
RAM.
Byte
the
colour
and
meaning
of
and
one
reverse
and
graphic/character
colourregisters
method
of
the
parts
memory
three
state
output
colour
from
MPU
to
buffer
state
(IC78,
store
and
colour
RAM
the
display
access
explanation
of
the
video
to
signal
generator
of
the
content
store
correspond
to
data
is
the
of
MPU
of
the
colour
register
it
display
RAM
area,
if
the
content
the
of
content
command.
of
mask
bit,
the
content
of"L"
In
case
into
colour
register
be
accessed)
can
40
character
mode
is
cycle
enough,
continuous
the
2
is
the
each
RAM
in
Basic
Level
Master
information
at
store
program
6~l2
Fig
6-ll,
Fig
of
colour
RAM
character
unit,
be
can
spe-
is
adopted
is
required.
latch
capable
read
RAM
through
HD74LS367AP).
79,
but
colour
RAM,
in
area
operation.
from
is
taken
into
RAM
the
colour
is
RAM
written
into
store
is
written
in
is
judged
by
is
or
store
RAM
colour
register
in
colour
level,
colour
by
MPU
read
3
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