- U880
The U880 was an
8-bit microprocessor manufactured in theGerman Democratic Republic . It was manufactured inNMOS technology and encased in a DIL40 package.The U880 CPU was used between
1985 and1989 in theKC 85 /2, KC 85/3 and KC 85/4 computers (manufactured by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen), in theZ1013 (manufactured by Robotron Riesa), Robotron 1715 and also in other office and amateur computers in the GDR.The U880 is almost identical copy of the
Zilog 's 8-bit Z80 microprocessor. Differences include absence of CY flag setting in OUTI command (when L goes zero) and another behaviour of hidden bus register seen through undocumented F3 and F5 flags. RussianКР1858ВМ1 chips work the same way as U880.The U880 was developed and manufactured as a non-licensed reproduction by VEB Mikroelektronik "Karl Marx" (
Erfurt ). A pin and function-compatibleCMOS processor system with the designation of U84C00 was also under development.The variant UB880 corresponds to the original Z80 processor, the UA880 to a Z80A CPU and the VB880 to a Z80 version with extended temperature specification (-25°C to +85°C) for military and industrial applications. Reproductions of Zilog's peripheral components PIO (U 855), SIO (U 856), CTC (U 857), DMA (direct memory access) (U 858) and DART (U 8563) were also manufactured.
External links
* [http://www.cpu-collection.de/?l0=cl&l1=Z80&l2=Eastern%20Bloc U880 Processors: images and descriptions from cpu-collection.de]
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