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Sharp MZ-800 Service Manual page 42

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·
,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
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i
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r
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eli
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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

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