$A d e v i c e w i t h d a t a t r a n s f e r r a t e 10 K B / s e c$
$i s c o n n e c t e d t o a C P U . D a t a i s t r a n s f e r r e d$
$b y t e - w i s e . L e t t h e i n t e r r u p t o v e r h e a d b e 4 μ$
$s e c . T h e b y t e t r a n s f e r t i m e b e t w e e n t h e d e v i c e$
$i n t e r f a c e r e g i s t e r a n d C P U o r m e m o r y i s$
$n e g l i g i b l e . W h a t i s t h e m i n i m u m p e r f o r m a n c e$
$g a i n o f o p e r a t i n g t h e d e v i c e u n d e r i n t e r r u p t$
$m o d e o v e r o p e r a t i n g i s u n d e r p r o g r a m$
$c o n t r o l l e d m o d e ?$

35

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15

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45

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25

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Solution

The correct option is D $25$
$E T_{P r o g - I O}$ :
$10 k B \Rightarrow 1 s e c$
$1 B \Rightarrow ? s e c$
$E T_{P r o g - I O} = 100 μ s e c$
$E T_{I N T - I O} = 4 μ s e c$
$S = 100 / 4$
$= 25$

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