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IMS IMSAI 8080 User Manual page 118

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F U N C T I O N A L D E S C R I P T I O N
T h e C P - A b o a r d is t h e o p e r a t o r ' s p a n e l f o r t h e I M S A I
8 0 8 0 Syst e m .
I t i n c l u d e s o p e r a t o r s w i t c h e s ,
l i g h t s a n d a l l l o g i c n e c e s s a r y to o p e r a t e t h e I M S A I
8 0 8 0 Sys t e m .
T h e p a n e l is c o m p l e t e l y s e l f - c o n t a i n e d a n d p l u g s
t h e b a c k p l a n e ' s 100 p i n e d g e c o n n e c t o r .
d e s i g n it is n o t n e c e s s a r y t o m o u n t t he C P - A a t t h e
f r o n t o f t h e c a b i n e t .
(via a n e x t e n d e r card)
b a c k p l a n e .*
A full set of
16 a d d r e s s s w i t c h e s a n d 6 c o n t r o l f u n c t i o n
s w i t c h e s a c c e p t o p e r a t o r c o n t r o l a n d input.
d i c a t o r s are p r o v i d e d for t h e
8 b i t d a t a bu s ,
f o r I N T E R R U P T S ,
p r o g r a m m e d o u t p u t .
T h e C P - A b o a r d c o n t a i n s the
t h e 8 p r o g r a m m e d o u t p u t i n d i c a t o r s a n d t h e
t o r e a d an 8 - b i t i n p u t b y t e f r o m t h e h i g h - o r d e r a d d r e s s
s w i t c h e s .
T h e D A T A B U S
b i - d i r e c t i o n a l p o r t i o n of th e d a t a bu s
c a b l e t o t he M P U boar d )
r e a d o r w r i t t e n b y t h e 8080 p r o c e s s o r .
T h e i n d i c a t o r s on t he p a n e l a r e w i d e - a n g l e - v i e w l i g h t
e m i t t i n g d i o d e s m o u n t e d b e h i n d a c o n t r a s t - e n h a n c i n g
a c r y l i c p a n e l a s s e m b l y .
a r e e x p l i c i t l y m a r k e d .
l ab e l s a r e v e r y clear,
c a n n e v e r w e a r off.
b i n a r y b i t v a l u e s a r e l a b e l e d f o r b o t h h e x a d e c i m a l
* T h e s w i t c h e s
a re i n c l u d e d o n the f r o n t p a n e l w h e t h e r
it is m o u n t e d i n t he front o f t he p a n e l o r not.
C P - A
Instead,, t h e b o a r d c a n b e p l u g g e d
i n t o a n y a v a i l a b l e s l o t i n the
16 b i t a d d r e s s b u s , the
the 8 b i t s t a t u s b y t e
E N A B L E D ,
RUN,
W A I T a n d
l ogic n e c e s s a r y to d r i v e
i n d i c a t o r s a r e r u n f r o m t h e
a nd s h o w d a t a e i t h e r b e i n g
A l l i n d i c a t o r s a n d s w i t c h e s
T he p h o t o g r a p h i c a l l y p r o d u c e d
p r o t e c t e d b y c l e a r a c r y l i c ,
B i t p o s i t i o n s a r e n u m b e r e d ,
C P - A
Functional Description
Revision l
i n d i c a t o r
in t o
W i t h t h i s
L E D i n ­
( control i n d i c a t o r s
. 8 b i t s o f
l o g i c n e e d e d
(via a f l a t
and
an d
4 -1

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