Bally 5000 Plus, Manual

Page: 177 / 388

C i r cu i t Desc r i pt i on ( co n t ' d )
F 4 decodes t he se l e c t ed po r t a n d
s e n d s a w r i t e pu l se ( WP ) t o t h e
po r t . T h e MPU boa r d t h en w r i t e s
uppe r d a t a b y t es o v e r t he uppe r
d a t a l i nes ( 08-0 1 5 ) .
W r i t e d a t a wo r ds
F 2 and F 4 a r e se l e c t e d a t t he s ame
t i me . T h e y decode a d j acent po r t s , 1
us i ng l ower d a t a I i nes and 1 us i ng
upper da t a I i nes . T h e fo l l ow i ng
a d j acent po r t s a r e decoded f o r
t r a n s f e r r i ng d a t a wo r d s .
On l y
and
0 1 5 )
P i n
1 0
1 1
1 2
1 3
1 4
1 5
P i n
1 0
1 1
1 2
1 3
1 4
1 5
1
1
PORTS
0- 1
2-3
4-5
po r t w i t h da t a
po r t w i t h d a t a
l i nes ( 0 0-07 )
l i nes ( 08-
c a n be a c t i v a t e d a t 1 t i me .
F 2
Por t C h i p
WP 1 1 1 1 ( B ) ( o f f boa r d )
WP9 9 ( o f f boa r d )
WP7 7 ( o f f boa r d )
WP 5 5 B 3 p i n 1 1
WP 3 3 E 2 p i n 1 1
WP 1 B 2 p i n 1 1
F 4
Por t C h i p
WP 1 2 1 0 C A ) E 6 p i n 1 1
WP 1 0 8 ( o f f boa r d )
WP8 6 ( o f f boa r d )
WP6 4 B 5 p i n 1 1
WP4 2 B6 p i n 1 1
WP 2 0 B 4 p i n 1 1
4 . I /O BOARD
NOT E S
4-9