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