Bally 5000 Plus, Manual

Page: 333 / 388

Conn e c t o r Loca t i on a n d U s e
J 1
J 1 i s a 34-p i n con n e c t o r t h a t i n t e r f a ces
w i t h t he b a c k p l ane boa r d at J 1 2 ( me s s age
cen t e r ) . E v e n- numb e r e d p i ns f r om 2 t o 3 0
a r e g rounde d . T h e powe r comes I n on p i ns
3 1 t h rough 34 . An a c t i ve l ow on p i n 2 7
a I l ows t he so f t wa r e t o t e I I I f t he L E D
boa r d I s connec t e d .
C i r cu i t Descr i pt i on
C h i p Se l e c t
W I N a n d PA I D L EO s r ece i ve t h e i r s i gn a l
f r om J 1 -p l n 7 ( S E L A ) . C R E D I TS , LAST I N ,
and CO I N I N L E O s r e ce i ve t he i r s i gna l f r om
J 1 -p l n 5 ( S EL B ) .
I f t h e mode p i n ( U 1 -p l n 9 ) I s a c t i ve h i g h
a n d t he wr i t e p i n ( U 1 -p l n 8 ) I s l ow , t he n
U 1 i s s e l ec t ed . T o s e l e c t U 2 , t he mode p i n
( U 2-p l n 9 ) I s a c t i ve h i g h a nd t he wr i t e
p i n ( U2-p l n 8 ) l s l ow .
The f i r s t wr i t e pu l se s e l ec t s t he c h i p a n d
t e l I s t he ch i p t o use t he n e x t 8 b i t s f o r
segmen t I n fo r ma t i on o f t he 1 s t L E D d i sp l ay
( 0 1 ) . Each subseque n t d a t a b y t e goes I n t o
0 2 , 0 3 , e t c . T h e n e x t 8 l ow-go i ng wr i t e
pu l ses I nput d a t a I n t o t he I n t e r na l RAM on
t he d i sp l ay d r i ve r I e ch i ps ( U 1 or U 2 ) .
Da t a I s c l oc k e d I n t o t he c h i p on a f i r s t ­
i n- f i r s t -ou t b a s i s . The d a t a for d i g i t * 1
I s f i r s t ; d i g i t *8 I s l as t . B i na r y d i g i t
I nf o r m a t i on :
1 07 1 06 I DS 1 04 1 0 3 1 02 1 0 1 1 00
OP
A B C E G F 0
On t he 9 t h t r a n s i t i on o f t he wr I t e pu l se ,
t he
ch i p becomes
dese l ec t e d a n d a n
I n t e r n a l o sc l l a t or t a k e s o v e r mu l t i p l e x i ng
d i g i t a n d segme n t i n f o r ma t i on t o e a c h
d i sp l a y .
FO-5000-1 ( Re v A )
1 2-A . LED D I SPLAY BOARD
NOTES
1 2A-5