U880

of the U880; size 4513 μm x 4251 μm (first die shrink 1984); chip inscription at the bottom of the image: "U880/5 HL JH 84" The U880 was manufactured in NMOS technology and encased in a plastic DIL40 package with a pin spacing of 2.5 mm (export versions had the Western pin spacing of 2.54 mm; Russian variants also came in a ceramic package). The military version of the U880 has an additional "MEK 4" marking. Robotron UA880D MME 1.jpg|UA880D (1986) Robotron UB880D MME S1 1.jpg|UB880D S1 hobbyist version (1989) Robotron UB880D MME MEK4 1.jpg|UB880D with military "MEK 4" marking (1989) Robotron VB880D MME 1.jpg|VB880D industrial temperature version (1990) Robotron 80A CPU MME 1.jpg|80A-CPU marking for export U880DC08 C3 FWE-L.jpg|U880DC08 (1992) ==Support chips==

U8272D04 (1989) VEB Mikroelektronik "Karl Marx" also manufactured a number of support chips for the U880. The prefixes UA, UB, VB, 80, and 80A correspond to the same temperature ranges and clock rates as for the processor variants above. Likewise, the suffix S1 indicates the out-of-spec, hobbyist version. ==Applications==

The U880 was by far the most widely used microprocessor in the German Democratic Republic. Examples are: • office computers A 5120, PC 1715 (both by VEB Robotron), the 1715 used a second U880 just for the keyboard. • home computers KC 85, KC compact (both by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen), KC 87, Z1013 (both by VEB Robotron), LC80 by Kombinat Mikroelektronik Erfurt • arcade game Poly Play (by VEB Polytechnik) At the time the U880 was the most advanced 8-bit processor available in the Eastern Bloc. Only clones of the Intel 8080 were manufactured in Poland, Czechoslovakia, Hungary, Romania, and the Soviet Union. As the Z80 replaced the Intel 8080 in the West, the U880 was used throughout the Eastern Bloc. Examples are: • Poland: home computers Mera-Elzab Meritum, , Elwro 800 Junior, • Czechoslovakia: home computers Didaktik Gama, Tesla Ondra • Hungary: home computer • Romania: home computers Electromagnetica JET, , , • Soviet Union: home computer Dubna 48K ==Further development==

Following the example of Zilog where the Z80 was succeeded by the 16-bit processors Z8001 / Z8002, VEB Mikroelektronik "Karl Marx" produced the U8001 / U8002. And just like its Western counterpart, the U8001 / U8002 saw far less use than the U880. When MS-DOS emerged as the dominant operating system for personal computers, in the Eastern Bloc the only available clone of the Intel 8086 was the Soviet K1810VM86. VEB Mikroelektronik "Karl Marx" then proceeded to develop a clone of the Intel 80286, the U80601. Due to the economic changes following the German reunification in 1990, neither project proceeded beyond pilot production. VEB Mikroelektronik "Karl Marx" (MME) was privatized in 1990 under the name ERMIC GmbH, a large part of which became Thesys Gesellschaft für Mikroelektronik mbH in 1992. Thesys under its new name. A die shrink chip with the marking U880/6 had been developed in 1990 and went into production some time after that. The smaller chip allowed clock rates up to 8 MHz for the U880DC08 and Thesys Z80H. While Zilog likely could have taken up legal action against the successors of VEB Mikroelektronik "Karl Marx" for copyright infringement, they recruited Thesys as a Zilog distributor instead. From about 1991 until 1993, bare U880 chips were sold to Russian and Ukrainian companies and packaged there. Initially the U880/5 chip revision was labelled as 80A-CPU and (). Later integrated circuits with U880/6 chips inside received the official designation () for the plastic package and KM1858VM1 () for the ceramic package. Manufacturers include Angstrem Zelenograd, Kvazar Kiev, and VZPP Voronesh. ==References==