U880

The U880 is an 8-bit microprocessor that was manufactured by VEB Mikroelektronik "Karl Marx" Erfurt (abbreviated as MME; part of Kombinat Mikroelektronik Erfurt) in the German Democratic Republic. Production of the U880 started in 1980 at VEB Funkwerk Erfurt (abbreviated as FWE; the plant was renamed to VEB Mikroelektronik "Karl Marx" in 1983). The U880 is an unlicensed clone of the Zilog Z80 microprocessor, also supporting illegal opcodes and bugs, except for very minor differences like not setting the CY flag for the command (when L goes zero).

==Processor variants== thumb|Die shot 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"]] thumb|Die shot of the U880; size 3601 μm x 3409 μm (second die shrink 1990); chip inscription at the bottom of the image: "U880/6 HL MME 1990" 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). {|class="wikitable |- !Temperature range !Clock rate !Designations |- |0 °C to +40 °C |1.0 MHz |UD880D, UB880D S1 |- |rowspan=3|0 °C to +70 °C |2.5 MHz |U880D, UB880D, 80-CPU |- |4.0 MHz |UA880D, 80A-CPU |- |8.0 MHz |U880DC08, Thesys Z80H |- |−25 °C to +85 °C |2.5 MHz |VB880D |}