Bally 5000 Plus, Manual

Page: 174 / 388

4 .
1 /0
BOARD
Connec t o r Loca t i on and Use
P l
P 1 I s a 96 p i n connec t o r w i t h 3 2
p i ns I n e a c h r ow o f A , 8 , a n d C .
J 1
J l I s a SO p i n dua I
wh i c h I n f e r f ac e s t o
d i s t r i bu t i on boa r d .
J 2
J 2 I s a 3 4 p i n dua l
wh i c h I n t e r f ac e s t o
cont r o l boa r d .
r ow h e a d e r
t he door
r ow h e a d e r
t he
r e e l
See
1 /0
BOARD S I GNALS
TABL E .
LOCAT I ON
C i r cu i t Descr i pt i on
Decode Add r e s s
Sof t wa r e a d d r e s s e s t he 1 /0 boa r d o n
t he a d d r e s s l i ne s
( A 1 -A 1 S ) . T h e
s i gn a l s o n A 1 -A3 a r e cons t an t l y
p r esent t o t he f o l l ow i ng c h i ps .
Ch i p
A 1 -A3 G 1 p i n 1 1 - 1 3
A 1 -A3 F 2 p i n 1 -3
A 1 -A3 F 3 p i n
1 -3
A 1 -A3 F4 p i n
1 -3
T h e s i gna l s on A4-A 1 1 a n d A 1 3-A 1 S
a r e
I nve r t e d I n F 1 , F S , a n d G S .
The a d d r e s s s t robe ( AS ) s i gna I I s
I n ve r t e d i n F l . T h e s e s i gna l s a n d
A1 2 a r e g a t ed I n G 3 wh i c h sends a
l og i c LOW s i gna l t o G 2 p i n 9 .
The a d d r e s s mod
i
f I e r I I nes ( AMO­
AMS ) o r i g i na t e on t he MPU boa r d
f r om t he p r ocessor f u n c t i on s t a t us
s i gna l s and t he I /O D E C s i g na l . G4
compa r e s t hese s i gn a l s t o t he h e x
va l ue 2D o r 2 9 ( se n t f r om t he
m i c r op r ocessor ) . G4 p i n 1 9 sends
a l og i c LOW s i gna l t o G 2 p i n 1 0 .
4-6
NOT ES