<s>
ANDOS	B-Device
is	O
a	O
Russian	O
operating	B-General_Concept
system	I-General_Concept
for	O
Electronika	B-Device
BK	I-Device
series	O
computers	O
:	O
BK-0010	B-Device
,	O
BK-0011	O
,	O
and	O
BK-0011M	O
.	O
</s>
<s>
They	O
were	O
based	O
on	O
the	O
PDP-11	B-Device
architecture	O
by	O
Digital	O
Equipment	O
Corporation	O
.	O
</s>
<s>
ANDOS	B-Device
was	O
created	O
in	O
1990	O
and	O
released	O
first	O
in	O
1992	O
.	O
</s>
<s>
It	O
was	O
the	O
only	O
widespread	O
system	O
on	O
BK	O
series	O
computers	O
that	O
used	O
MS-DOS-compatible	O
file	B-Application
system	I-Application
format	O
.	O
</s>
<s>
ANDOS	B-Device
used	O
the	O
FAT12	B-Application
file	B-Application
system	I-Application
on	O
800Kb	O
floppy	B-Device
disks	I-Device
.	O
</s>
<s>
For	O
Electronika	B-Device
BK-0011M	I-Device
and	O
BK-0011	O
,	O
ANDOS	B-Device
could	O
emulate	O
a	O
BK-0010	B-Device
by	O
loading	O
a	O
BK-0010	B-Device
read-only	B-Device
memory	I-Device
(	O
ROM	B-Device
)	O
image	O
into	O
BK-0011(M )	O
random-access	B-Architecture
memory	I-Architecture
(	O
RAM	B-Architecture
)	O
.	O
</s>
<s>
In	O
minimal	O
configuration	O
,	O
the	O
system	O
could	O
occupy	O
less	O
than	O
4Kb	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
The	O
system	O
was	O
able	O
to	O
support	O
up	O
to	O
64	O
disk	O
drives	O
(	O
or	O
hard	B-Device
disk	I-Device
drive	I-Device
partitions	O
)	O
,	O
and	O
RAM	B-Application
disks	I-Application
in	O
the	O
computer	O
's	O
memory	O
and	O
tape	O
recording	O
.	O
</s>
<s>
It	O
could	O
also	O
have	O
read-only	O
access	O
to	O
MicroDOS	O
file	B-Application
system	I-Application
format	O
disks	O
,	O
although	O
in	O
the	O
last	O
version	O
,	O
this	O
function	O
was	O
transferred	O
from	O
system	O
core	O
to	O
the	O
file	O
manager	O
and	O
became	O
optional	O
.	O
</s>
