1 2 .
VACUUM FLUORESCENT D I SPLAY BOARD
C i r cu i t Des c r i pt i on
Powe r
T h e 5 VOC a t J 1 p i n 3 1 -34 goes
t o
t he
cus t om
OC/ OC-AC
vo l t age
conve r t e r ( VR 1 ) . VR 1 conve r t s t he
vo l t age t o t he f o l l ow i ng out pu t s .
40
VOC
for
t he d i sp l ay
un i t a n d
h i gh-vo I t age
l og i c
5 . 4 VAC peak
to
peak
a t
a p p r o x -
I ma t e l y 1 4K H z f o r
t he
d i sp l a y f i l amen t
+5
VOC
for c a t hode b i a s
p rov i s i on
I nput
U 1 7
p i n
1 4 out pu t s a
l og i c
H I GH
over 0 1
t o
J 1 p i n
1 3
when
t he
688701
m i c rocomp u t e r
I s
busy
p rocess i ng d a t a .
When
0 1
I s
a
l og i c
LOW , command and
d a t a
I nput
t r a ns f e r s ove r 0 0-07 t o
U 1 7 .
J 1
D a t a
&
Command
U 1 7
P i n
P i n
1 1
DO
1 3
1 3
0 1
1 4
1 5
0 2
1 5
1 7
0 3
1 6
1 9
0 4
1 7
2 1
05
1 8
2 3
0 6
1 9
25
07
2 0
J 1
p i n 9 s e n d s a l og i c LOW WR I T E
( WR ) s i gna l
t o U 1 7 p i n 39
t o
I n t e r r up t
t he m i c r ocompu t e r
t o
r ece i ve t he v a l i d I nput s . J 1 p i n 7
sends
t he s t a t us of AO t o U 1 7 p i n
29 .
A H I GH AO s i gn a l
t e l I s t h a t
t he
t ype o f I nput d a t a I s f o r t he
cur sor pos i t i on on t he d i sp l ay .
A
LOW AO s i g n a l t e l I s t h a t t he
t ype
of
I nput d a t a I s for t he
commands
and a c t ua l
s c r een d a t a f o r
t he
d i sp l ay .
1 2-6
NOTE S
Summary of Contents for 5000 Plus
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Page 125: ...3 MPU BOARD Troub l eshoot i ng cont d CLOCK D I AGRAM Vee 3 68...
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Page 242: ...HOPPER CONTROL BOARD Boar d Assemb l y AS 3556 1 3 o 0 o Q5 r 7 4...
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Page 361: ...1 5 APPEND I CES APPEND I X 4 Co i n Mechan i sm I nc 1 5 6...
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Page 383: ...APPEND I X 6 Ser v i ce Su i l e t i ns 1 5 APP END I CES 1 5 1 2...
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