<s>
An	O
end	B-Device
of	I-Device
interrupt	I-Device
(	O
EOI	O
)	O
is	O
a	O
computing	O
signal	O
sent	O
to	O
a	O
programmable	B-Architecture
interrupt	I-Architecture
controller	I-Architecture
(	O
PIC	O
)	O
to	O
indicate	O
the	O
completion	O
of	O
interrupt	B-Application
processing	O
for	O
a	O
given	O
interrupt	B-Application
.	O
</s>
<s>
Interrupts	B-Application
are	O
used	O
to	O
facilitate	O
hardware	O
signals	O
sent	O
to	O
the	O
processor	O
that	O
temporarily	O
stop	O
a	O
running	O
program	O
and	O
allow	O
a	O
special	O
program	O
,	O
an	O
interrupt	B-General_Concept
handler	I-General_Concept
,	O
to	O
run	O
instead	O
.	O
</s>
<s>
An	O
EOI	O
is	O
used	O
to	O
cause	O
a	O
PIC	O
to	O
clear	O
the	O
corresponding	O
bit	O
in	O
the	O
in-service	B-Architecture
register	I-Architecture
(	O
ISR	O
)	O
,	O
and	O
thus	O
allow	O
more	O
interrupt	B-General_Concept
requests	I-General_Concept
(	O
IRQs	B-General_Concept
)	O
of	O
equal	O
or	O
lower	O
priority	O
to	O
be	O
generated	O
by	O
the	O
PIC	O
.	O
</s>
<s>
EOIs	O
may	O
indicate	O
the	O
interrupt	B-General_Concept
vector	I-General_Concept
implicitly	O
or	O
explicitly	O
.	O
</s>
<s>
An	O
explicit	O
EOI	O
vector	O
is	O
indicated	O
with	O
the	O
EOI	O
,	O
whereas	O
an	O
implicit	O
EOI	O
vector	O
will	O
typically	O
use	O
a	O
vector	O
as	O
indicated	O
by	O
the	O
PICs	B-Architecture
priority	O
schema	O
,	O
for	O
example	O
the	O
highest	O
vector	O
in	O
the	O
ISR	O
.	O
</s>
<s>
Also	O
,	O
EOIs	O
may	O
be	O
sent	O
at	O
the	O
end	B-Device
of	I-Device
interrupt	I-Device
processing	O
by	O
an	O
interrupt	B-General_Concept
handler	I-General_Concept
,	O
or	O
the	O
operation	O
of	O
a	O
PIC	O
may	O
be	O
set	O
to	O
auto-EOI	O
at	O
the	O
start	O
of	O
the	O
interrupt	B-General_Concept
handler	I-General_Concept
.	O
</s>
