U880

The U880 was produced in the GDR 8- bit main processor for computers. It is made in n- MOS technology and is situated in a DIL40 housing.

The U880 CPU was as a general purpose processor 1980-1989 in the home computers KC 85/2-4 VEB Microelectronics " Wilhelm Pieck " Mühlhausen, the KC 87 of the VEB Robotron measurement electronics "Otto Schön " Dresden and its predecessor models 9001 and Z KC 85 / 1, the Z1013 by VEB Robotron Elektronik Riesa, or Polyplay, the only arcade machines of the GDR, and, moreover, in another office, small and amateur computers such as the A 5120 VEB booking engines work of Karl -Marx-Stadt the PC in 1715 the VEB Robotron office machine work " Ernst Thalmann " Sömmerda used. It is well suited due to the easy -to-learn command set for easy data processing or control tasks and teaching purposes.

The U880 is an almost identical copy of the 8 -bit Z80 processor from Zilog. The differences are limited to the specific details, such as an unset CY flag when OUTI command. The Russian КР1858ВМ1 replicas are identical to the U880.

The U880 is designed and manufactured as unlicensed plagiarism by VEB Microelectronics " Karl Marx " Erfurt means of reverse engineering. A pin and function compatible processor system called U 84C00 DC based on CMOS technology was in development. The circuit set of these CMOS variant consisted of U 84C20 DC ( PIO), U 84C30 DC ( CTC ) and the SIO U 84C40 DC.

The following variants of the U880 were available:

• 80 - CPU - 880 corresponds to the UB as an export version
• 80A - CPU - 880 corresponds to the UA as an export version
• U 880 - corresponds to the original Z80 (initial designation, later renamed UB 880 )
• UA 880 - corresponds to the Z80A, maximum clock frequency of 4 MHz.
• UB 880 - corresponds to the original Z80. Maximum clock frequency of 2.5 MHz
• VB 880 - Z80 version with extended temperature specification ( -25 ° C to 85 ° C) for industrial applications. Maximum clock frequency of 2.5 MHz
• UD 880 - variant with reduced components data ( the measured data of the circuit was not the norm ), a so-called seizure type. Maximum clock frequency of 1 MHz.
• With additional MEK 4- stamp: Military version of the U880

As peripheral blocks were replicas of the Zilog PIO ICs ( U855 ), SIO ( U856 ), CTC ( U857 ), DMA ( U858 ) and DART ( U8563 ) were prepared. All peripherals were also in the clock and temperature range variants mentioned above. As memory EPROM, for example, U2732, and can dRAM 64K × 1 as the U2164 are used.