Service manual
· ,vIZ-800
3·7. Interfacing
with
the
MZ·800
Fig. 1 shows the block diagram for connection with the
printer.
Fig.
2 shows its circuit description. Fig. 3 shows
the timing chart.
3·8. Block diagram
00---1
ARDP---I
ARDA
---I
Buffer
'~~
LSD
0
,
I
2
!
3
I
i
4
1
5
I
I
6
7
8
9
I
A
i
B
I
c
i
D
E
I
I
F
I
I
I
Table
of
character set
D ! E
iw
Q!
1 A Q i I i ! 0 i i I
I
!G#3iC'S
I I
l"lwlm
i
El$4DT
I I !'V!sl i I
l[8]x5EU
I :u; i i
[]8x6FUI
I
it::1
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C
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i
ihid!';
I
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91
I
Yj
I
1'1
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I i K I I '
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I
ibif1oi:
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+ ; K [ ! C
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Xi
viCi~
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r , <
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eli
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:'
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i 1- =
NI
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Ir'iuiyi
MPU
Transistor
array
Solenoid
driver
Functional
Switches
PAPER FEED
PEN CHANGE
ARDA
---...,
Color
position
detector
X.axis
stepping
motor
V.axls
stepPing
motor
PEN
UP/Down
Solenoid
The
CPU
sends data to the printer after confirming that
ARDA
is
in low state. Five micro seconds later, the strobe
signal
ARDP goes high. The
CPU
confirms that ARDA
is
in
high state, ARDP
is
returned
to
a low state 14.5 micro
seconds later.
DATA
____
~><~
______
~------
,
ARDP--------~--~
I
--:-:
-.;.:
...
51'S
I I
I I
41
.
L
I
I
14.5' :
I
I'S