<s>
The	O
U880	B-Device
is	O
an	O
8-bit	O
microprocessor	B-Architecture
that	O
was	O
manufactured	O
by	O
VEB	O
Mikroelektronik	O
"	O
Karl	O
Marx	O
"	O
Erfurt	O
(	O
abbreviated	O
as	O
MME	O
;	O
part	O
of	O
Kombinat	O
Mikroelektronik	O
Erfurt	O
)	O
in	O
the	O
German	O
Democratic	O
Republic	O
.	O
</s>
<s>
Production	O
of	O
the	O
U880	B-Device
started	O
in	O
1980	O
at	O
VEB	O
Funkwerk	O
Erfurt	O
(	O
abbreviated	O
as	O
FWE	O
;	O
the	O
plant	O
was	O
renamed	O
to	O
VEB	O
Mikroelektronik	O
"	O
Karl	O
Marx	O
"	O
in	O
1983	O
)	O
.	O
</s>
<s>
The	O
U880	B-Device
is	O
an	O
unlicensed	O
clone	B-General_Concept
of	O
the	O
Zilog	B-General_Concept
Z80	I-General_Concept
microprocessor	B-Architecture
,	O
also	O
supporting	O
illegal	B-Language
opcodes	I-Language
and	O
bugs	O
,	O
except	O
for	O
very	O
minor	O
differences	O
like	O
not	O
setting	O
the	O
CY	O
flag	O
for	O
the	O
command	O
(	O
when	O
L	O
goes	O
zero	O
)	O
.	O
</s>
<s>
The	O
U880	B-Device
was	O
manufactured	O
in	O
NMOS	B-Algorithm
technology	O
and	O
encased	O
in	O
a	O
plastic	O
DIL40	B-Algorithm
package	O
with	O
a	O
pin	O
spacing	O
of	O
2.5mm	O
(	O
export	O
versions	O
had	O
the	O
Western	O
pin	O
spacing	O
of	O
2.54mm	O
;	O
Russian	O
variants	O
also	O
came	O
in	O
a	O
ceramic	O
package	O
)	O
.	O
</s>
<s>
The	O
military	O
version	O
of	O
the	O
U880	B-Device
has	O
an	O
additional	O
"	O
MEK	O
4	O
"	O
marking	O
.	O
</s>
<s>
VEB	O
Mikroelektronik	O
"	O
Karl	O
Marx	O
"	O
also	O
manufactured	O
a	O
number	O
of	O
support	O
chips	O
for	O
the	O
U880	B-Device
.	O
</s>
<s>
The	O
U880	B-Device
was	O
by	O
far	O
the	O
most	O
widely	O
used	O
microprocessor	B-Architecture
in	O
the	O
German	O
Democratic	O
Republic	O
.	O
</s>
<s>
office	O
computers	O
A	O
5120	O
,	O
PC	O
1715	O
(	O
all	O
by	O
VEB	O
Robotron	O
)	O
,	O
the	O
1715	O
used	O
a	O
second	O
U880	B-Device
just	O
for	O
the	O
keyboard	O
.	O
</s>
<s>
At	O
the	O
time	O
the	O
U880	B-Device
was	O
the	O
most	O
advanced	O
8-bit	O
processor	O
available	O
in	O
the	O
Eastern	O
Bloc	O
.	O
</s>
<s>
Only	O
clones	B-General_Concept
of	O
the	O
Intel	B-General_Concept
8080	I-General_Concept
were	O
manufactured	O
in	O
Poland	O
,	O
Czechoslovakia	O
,	O
Hungary	O
,	O
Romania	O
,	O
and	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
As	O
the	O
Z80	B-General_Concept
replaced	O
the	O
Intel	B-General_Concept
8080	I-General_Concept
in	O
the	O
West	O
,	O
the	O
U880	B-Device
was	O
used	O
throughout	O
the	O
Eastern	O
Bloc	O
.	O
</s>
<s>
Following	O
the	O
example	O
of	O
Zilog	O
where	O
the	O
Z80	B-General_Concept
was	O
succeeded	O
by	O
the	O
16-bit	O
processors	O
Z8001	B-Device
/	I-Device
Z8002	I-Device
,	O
VEB	O
Mikroelektronik	O
"	O
Karl	O
Marx	O
"	O
produced	O
the	O
U8001	O
/	O
U8002	O
.	O
</s>
<s>
And	O
just	O
like	O
its	O
Western	O
counterpart	O
,	O
the	O
U8001	O
/	O
U8002	O
saw	O
far	O
less	O
use	O
than	O
the	O
U880	B-Device
.	O
</s>
<s>
When	O
MS-DOS	B-Application
emerged	O
as	O
the	O
dominant	O
operating	O
system	O
for	O
personal	O
computers	O
,	O
in	O
the	O
Eastern	O
Bloc	O
the	O
only	O
available	O
clone	B-General_Concept
of	O
the	O
Intel	B-General_Concept
8086	I-General_Concept
was	O
the	O
Soviet	O
K1810VM86	B-Device
.	O
</s>
<s>
VEB	O
Mikroelektronik	O
"	O
Karl	O
Marx	O
"	O
then	O
proceeded	O
to	O
develop	O
a	O
clone	B-General_Concept
of	O
the	O
Intel	B-General_Concept
80286	I-General_Concept
,	O
the	O
U80601	B-Device
.	O
</s>
<s>
Furthermore	O
,	O
a	O
CMOS	O
version	O
of	O
the	O
Z80	B-General_Concept
was	O
developed	O
with	O
the	O
designation	O
U84C00	B-Device
.	O
</s>
<s>
Both	O
ERMIC	O
and	O
Thesys	O
continued	O
to	O
manufacture	O
the	O
NMOS	B-Algorithm
version	O
of	O
the	O
U880	B-Device
,	O
ERMIC	O
still	O
with	O
the	O
MME	O
name	O
and	O
logo	O
,	O
Thesys	O
under	O
its	O
new	O
name	O
.	O
</s>
<s>
A	O
die	O
shrink	O
chip	O
with	O
the	O
marking	O
U880/6	B-Device
had	O
been	O
developed	O
in	O
1990	O
and	O
went	O
into	O
production	O
some	O
time	O
after	O
that	O
.	O
</s>
<s>
The	O
smaller	O
chip	O
allowed	O
clock	O
rates	O
up	O
to	O
8MHz	O
for	O
the	O
U880DC08	B-Device
and	O
Thesys	B-Device
Z80H	I-Device
.	O
</s>
<s>
From	O
about	O
1991	O
until	O
1993	O
,	O
bare	O
U880	B-Device
chips	O
were	O
sold	O
to	O
Russian	O
and	O
Ukrainian	O
companies	O
and	O
packaged	O
there	O
.	O
</s>
<s>
Initially	O
the	O
U880/5	B-Device
chip	O
revision	O
was	O
labelled	O
as	O
80A-CPU	B-Device
and	O
T34VM1	B-Device
(	O
)	O
.	O
</s>
<s>
Later	O
integrated	O
circuits	O
with	O
U880/6	B-Device
chips	O
inside	O
received	O
the	O
official	O
designation	O
KR1858VM1	B-Device
(	O
)	O
for	O
the	O
plastic	O
package	O
and	O
KM1858VM1	B-Device
(	O
)	O
for	O
the	O
ceramic	O
package	O
.	O
</s>
