<s>
The	O
Durango	B-Device
F-85	I-Device
was	O
an	O
early	O
personal	B-Device
computer	I-Device
introduced	O
in	O
September	O
1978	O
by	O
Durango	B-Device
Systems	I-Device
Corporation	I-Device
,	O
a	O
company	O
started	O
in	O
1977	O
by	O
George	O
E	O
.	O
Comstock	O
,	O
John	O
M	O
.	O
Scandalios	O
and	O
Charles	O
L	O
.	O
Waggoner	O
,	O
all	O
formerly	O
of	O
Diablo	O
Systems	O
.	O
</s>
<s>
The	O
F-85	O
could	O
run	O
its	O
own	O
multitasking	O
operating	O
system	O
called	O
DX-85M	O
,	O
which	O
included	O
an	O
integral	O
Indexed	O
Sequential	O
(	O
ISAM	B-Application
)	O
file	O
system	O
and	O
per-task	O
file	O
locking	O
,	O
or	O
alternatively	O
CP/M	B-Application
-80	I-Application
.	O
</s>
<s>
DX-85M	O
utilized	O
a	O
text	O
configuration	O
file	O
named	O
CONFIG.SYS	B-Device
five	O
years	O
before	O
this	O
filename	O
was	O
used	O
for	O
a	O
similar	O
purpose	O
under	O
MS-DOS/PC	O
DOS	O
2.0	O
in	O
1983	O
.	O
</s>
<s>
The	O
F-85	O
used	O
single-sided	O
5¼-inch	O
100	O
tpi	O
diskette	O
drives	O
providing	O
480KB	O
utilizing	O
a	O
high-density	O
4/5	B-Device
group	I-Device
coded	I-Device
encoding	I-Device
.	O
</s>
<s>
The	O
machine	O
was	O
using	O
a	O
Western	O
Digital	O
FD1781	O
floppy-disk	B-Device
controller	I-Device
with	O
77-track	O
Micropolis	O
drives	O
.	O
</s>
<s>
Still	O
later	O
,	O
they	O
designed	O
a	O
80186-/80286	O
-based	O
16-bit	O
system	O
,	O
the	O
Durango	O
"	O
Poppy	O
"	O
;	O
MS-DOS	B-Application
was	O
selected	O
as	O
the	O
entry	O
operating	O
system	O
.	O
</s>
