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6-4-4
Display
The
display
display
to
change
DOTCK,
LOAD,
signal
of
40
and
of
level,
pins
lY-4Y.
6-4-5
CRTC
block
CRTC
generates
address
signal
the
recognise
written
block
is
CRTC-SEL
signal
signal
to
RS
for
the
system
signal
of
display
with
MPU
data
1
,Q
modeChBHQ9
character
character
switching
mode
40
characters
mode
to
CHRCK
and
GRENBLE
when
characters
mode,
80
character
mode
Block
the
signals
for
the
display
location
of
the
light
in
6-lO.
fig.
is
inputted
to
terminal
(24
Pin)
clock
is
inputted
address
signal
bus.
Fig.5-8
CRTC
Address
RSglSt@r
6?
RS
3
2
1
o
4
xxxxx]
x
1
o{xxxxx
o
o
o
o
o
o
o
1
o
1
o
1
o
o
o
1
0
0
0
1
o
1
o
1
1
o
o
o
o
1
1
1
1
_
_
_._.
_
|0'l{UU1uu|
o
o
1
o
1
o
1
111
o
o
1
1
o
1
1
1
1o0111R7yncrji-onougkpo.><O
1
o
01
o
o
o
o
1
o
1
R
o
1
o
o
1
o
1
o
1
o
1
o
1
o
0101011
o
o
o
1
o
1
1
1
1
o
1
1
o
o
1
o
1
o
1
1
o
y
'o
1
1
1
1
o
1
'o
o
o
o
1
1
o
o
o
o
1
0,1
1
circuit
circuit
(fig.
80
characters.
or
40
and
80
characters
of
Pin
IC38
l
input
when
High
Level,
are
video
for
signal
the
Also,
to
RAM.
the
on
screen.
pen
EE
terminal
(25
pin)
select
the
register
to
terminal
and
to
E
the
terminal.
to
CLK
Internal
Register
Name
of
the
R e l § ? i S t
§egiSter
Valid
on
egfgigglt
AR
R0
Egrfifcghgiacte
. 8 ‹ § f
R1
9E&H?B1t\67;!1S
R2
us
R3
ertica1,tOta
1
...
M
a I a C t ‹ r l ' 1 O . ]
] § $ t § 1 2 § § ? r
R5
_A
ØgØØfdlllggl
Ea
R6
R7
yncrji-onougkpo
e
ace
R8
to
'
5'
t
er
a § § r e S § - f s
.
R9
Start
QBEQSE
R10
ggggg§@H<
R11
adifessm
§ 1 § § " f t
R12
5(E?rt55addfeSS
R13
g(H)
R14
cursor
(L)
C
f S f
R15
R16
light
pen
'
light
Pen
R11
IC38)
is
the
6-8,
the
Un
input
inputted.
use
are
(SELECT
terminal)
outputted
to
IC38
and_supp1y
generators
have
the
function
to
circuit
The
of
of
came
(11:36)
and
of
CRTC.E
TTL
signal
for
the
CHRCK
bus
is
connected
Data
Structure
WRITE
READ
g
|
-
-
9
X
X
O_
t a |
O
><
O
.X
Po
pu
se
O
I
I
n
X
} ' - |
O
><
g
YX
O
O
.><
ew
O
><
1
O
><
O
><
1
O
O
O
O
O
O
O
O
O
O
><
O
><
circuit
side,
Each
is
Low
output
the
CRTC
ABQ
signal
clock
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