Bally 5000 Plus, Manual

Page: 186 / 388

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C i r cu i t Desc r i pt i on ( con t ' d )
Out pu t Por t s
T h e r e a r e
7
out pu t por t s , t h r ee 6 . 3
VAC por t s , one and one ha l f 5 VDC
por t s , and t wo and one ha l f 2 4 VDC
por t s . The MPU boa r d w r i t e s to a
d a t a
b y t e . W i t h i n t ha t by t e ,
so f twa r e con t ro l s each b i t .
6 . 3 VAC ( L i gh t i ng ) Out pu t Por t s
Por t
Ch i p
o
8 4
1 8 2
2 E 2
W i t h t he WP s i gna I a t p i n 1 1 , t he
I nput da t a p r esen t I s l a t ched to
t he out pu t da t a . T h e a c t i ve H I GH
s i gna l passes t h rough a l i m i t i ng
r e s i s tor and t hen t h rough a
b l ock i ng d i ode . Th i s causes a
pos i t i ve t r i gger a t t he g a t e ( p i n
3 ) of t he t r i ac t o t u r n ON t he AC
l i g h t i ng .
The da t a r ema i ns l a t ched u n t l I a
( powe r up or h a r d ) o r a WP
w i t h new da t a t o be l a t ched
r es e t
s i gna l
I s sent .
The RESET s i gna l ( P 1 p i n 1 2C )
en t e r s t he c h i ps a t p i n 1 . RESET
d r i ves t he out pu t s o f t he l a t ches
t o l og i c LOW wh i ch cases t he
out pu t s t o be I na c t i ve .
4- 1 8
NOT E S