<s>
The	O
K	B-Device
1840	I-Device
,	O
full	O
name	O
RVS	O
K	B-Device
1840	I-Device
(	O
,	O
"	O
computer	O
system	O
with	O
virtual	B-Architecture
memory	I-Architecture
"	O
)	O
is	O
a	O
minicomputer	B-Architecture
from	O
the	O
German	O
Democratic	O
Republic	O
(	O
GDR	O
)	O
.	O
</s>
<s>
The	O
K	B-Device
1840	I-Device
minicomputer	B-Architecture
is	O
a	O
clone	O
of	O
VAX-11/780	O
from	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
.	O
</s>
<s>
The	O
export	O
of	O
western	O
32-bit	O
minicomputers	B-Architecture
to	O
Comecon	O
countries	O
was	O
forbidden	O
by	O
the	O
CoCom	O
technology	O
embargo	O
.	O
</s>
<s>
Therefore	O
one	O
was	O
developed	O
locally	O
,	O
using	O
computer	B-Application
aided	I-Application
design	I-Application
(	O
CAD	B-Application
)	O
technology	O
based	O
on	O
a	O
32-bit	O
computer	B-General_Concept
architecture	I-General_Concept
.	O
</s>
<s>
The	O
K	B-Device
1840	I-Device
is	O
the	O
first	O
32-bit	O
computer	O
of	O
the	O
M	O
32	O
VAX-compatible	O
minicomputer	B-Architecture
line	O
.	O
</s>
<s>
K	B-Device
1840	I-Device
has	O
a	O
maximum	O
computing	O
speed	O
of	O
1.1MIPS	O
;	O
it	O
can	O
access	O
up	O
to	O
16MiB	O
of	O
main	O
memory	O
and	O
up	O
to	O
4GiB	O
of	O
virtual	B-Architecture
memory	I-Architecture
.	O
</s>
<s>
While	O
the	O
K	B-Device
1840	I-Device
was	O
under	O
development	O
,	O
its	O
successor	O
(	O
the	O
K	O
1845	O
,	O
based	O
on	O
the	O
VAX-11/785	O
)	O
had	O
already	O
been	O
conceived	O
.	O
</s>
<s>
A	O
further	O
successor	O
was	O
contemplated	O
:	O
the	O
K	O
1850	O
,	O
with	O
a	O
performance	O
of	O
6MIPS	O
,	O
using	O
emitter-coupled	B-General_Concept
logic	I-General_Concept
(	O
ECL	O
)	O
gate	O
arrays	O
.	O
</s>
<s>
Robotron	O
developed	O
a	O
copy	O
of	O
the	O
MicroVAX	O
II	O
called	O
the	O
K	B-Device
1820	I-Device
,	O
which	O
reaches	O
approximately	O
90%	O
of	O
the	O
performance	O
of	O
the	O
K	B-Device
1840	I-Device
.	O
</s>
<s>
The	O
K	B-Device
1820	I-Device
is	O
fully	O
compatible	O
with	O
the	O
software	O
of	O
the	O
K	B-Device
1840	I-Device
,	O
so	O
that	O
already-developed	O
system	O
and	O
application	O
software	O
can	O
be	O
used	O
.	O
</s>
<s>
In	O
mid-1990	O
,	O
production	O
of	O
the	O
K	B-Device
1840	I-Device
and	O
K	O
1845	O
and	O
all	O
development	O
work	O
stopped	O
,	O
because	O
economical	O
production	O
was	O
not	O
feasible	O
under	O
free-market	O
conditions	O
resulting	O
from	O
the	O
currency	O
,	O
economic	O
and	O
social	O
union	O
of	O
East	O
and	O
West	O
Germany	O
on	O
1	O
July	O
1990	O
,	O
causing	O
the	O
collapse	O
of	O
Robotron	O
's	O
traditional	O
markets	O
in	O
the	O
Soviet	O
Union	O
and	O
East	O
Europe	O
.	O
</s>
<s>
There	O
are	O
K	B-Device
1840s	I-Device
in	O
the	O
Technische	O
Sammlungen	O
Museum	O
in	O
Dresden	O
,	O
in	O
the	O
Konrad-Zuse-Computermuseum	O
in	O
Hoyerswerda	O
and	O
in	O
the	O
Computer	O
History	O
Museum	O
in	O
Mountain	O
View	O
,	O
California	O
,	O
US	O
.	O
</s>
