Control C I R C U I T; Head Load C O N T R O L C I R C U I T - Tandy 1000 SL Technical Reference Manual

2 - 2 - 2 .
Control C i r c u i t
The c o n t r o l c i r c u i t c o n s i s t s o f s t r a p c i r c u i t , f r o n t LED c o n t r o l c i r c u i t ,
head load c o n t r o l c i r c u i t , w r i t e / e r a s e c o n t r o l c i r c u i t , motor-on g a t e ,
ready d e t e c t o r , s t e p p i n g motor c o n t r o l c i r c u i t , t r a c k c o u n t e r ,
RD/INDEX
g a t e , i n t e r f a c e d r i v e r , e t c .
Almost a l l t h e c i r c u i t s except f o r s t r a p c i r c u i t and s t e p p i n g motor
d r i v e r a r e enclosed i n t h e c o n t r o l LSI ( b i p o l a r LSI,
U l ) .
Fig.207 shows t h e block diagram.
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2 2 4
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