<s>
DCEbus	B-Architecture
is	O
a	O
computer	B-General_Concept
bus	I-General_Concept
standard	O
,	O
originally	O
developed	O
for	O
industrial	O
control	O
computers	O
interfacing	O
to	O
the	O
"	O
real	O
world	O
"	O
by	O
the	O
Belgian	O
company	O
Data	O
Applications	O
International	O
.	O
</s>
<s>
The	O
24	O
I/O	O
lines	O
available	O
on	O
the	O
DCEbus	B-Architecture
(	O
from	O
an	O
Intel	B-Device
8255	I-Device
of	O
the	O
controlling	O
computer	O
)	O
could	O
be	O
used	O
directly	O
,	O
or	O
could	O
use	O
the	O
"	O
DCE	O
bus	O
mode	O
"	O
,	O
in	O
which	O
the	O
24	O
I/O	O
lines	O
were	O
grouped	O
in	O
three	O
groups	O
of	O
eight	O
I/O	O
lines	O
,	O
of	O
which	O
the	O
first	O
group	O
was	O
used	O
for	O
data	O
,	O
and	O
of	O
the	O
second	O
group	O
two	O
were	O
used	O
for	O
read	O
and	O
write	O
strobes	O
,	O
and	O
one	O
for	O
"	O
bus	O
expansion	O
"	O
,	O
the	O
third	O
group	O
was	O
used	O
for	O
eight	O
"	O
card	O
address	O
lines	O
"	O
.	O
</s>
