<s>
IMDOS	B-Operating_System
was	O
a	O
modified	O
version	O
of	O
the	O
CP/M	B-Application
operating	I-Application
system	I-Application
for	O
Intel	B-General_Concept
8080	I-General_Concept
processors	O
,	O
used	O
by	O
IMS	O
Associates	O
,	O
Inc	O
.	O
(	O
IMS	O
)	O
for	O
their	O
IMSAI	B-Device
8080	I-Device
personal	B-Device
computer	I-Device
.	O
</s>
<s>
Since	O
MITS	O
would	O
not	O
license	O
their	O
operating	B-General_Concept
system	I-General_Concept
to	O
other	O
manufacturers	O
,	O
IMS	O
approached	O
Gary	O
Kildall	O
and	O
paid	O
a	O
fixed	O
fee	O
of	O
$	O
25,000	O
for	O
a	O
non-exclusive	O
CP/M	B-Application
license	O
.	O
</s>
<s>
IMDOS	B-Operating_System
introduced	O
interrupt-driven	O
devices	O
,	O
tree-structured	O
directories	O
,	O
and	O
other	O
advances	O
to	O
CP/M	B-Application
.	O
</s>
