<s>
A	O
computer	B-General_Concept
bureau	I-General_Concept
is	O
a	O
service	O
bureau	O
providing	O
computer	O
services	O
.	O
</s>
<s>
Computer	B-General_Concept
bureaus	I-General_Concept
developed	O
during	O
the	O
early	O
1960s	O
,	O
following	O
the	O
development	O
of	O
time-sharing	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
These	O
allowed	O
the	O
services	O
of	O
a	O
single	O
large	O
and	O
expensive	O
mainframe	B-Architecture
computer	I-Architecture
to	O
be	O
divided	O
up	O
and	O
sold	O
as	O
a	O
fungible	O
commodity	O
.	O
</s>
<s>
Development	O
of	O
telecommunications	O
and	O
the	O
first	O
modems	B-Application
encouraged	O
the	O
growth	O
of	O
computer	B-General_Concept
bureau	I-General_Concept
as	O
they	O
allowed	O
immediate	O
access	O
to	O
the	O
computer	O
facilities	O
from	O
a	O
customer	O
's	O
own	O
premises	O
.	O
</s>
<s>
The	O
computer	B-General_Concept
bureau	I-General_Concept
model	O
shrank	O
during	O
the	O
1980s	O
,	O
as	O
cheap	O
commodity	O
computers	O
,	O
particularly	O
the	O
PC	O
clone	O
but	O
also	O
the	O
minicomputer	B-Architecture
allowed	O
services	O
to	O
be	O
hosted	O
on-premises	B-General_Concept
.	O
</s>
