U80701

The U80701 is a replica of the microprocessor type MicroVAX 78032 Digital Equipment Corporation (DEC ), which was developed by reverse engineering. He was the first in the German Democratic Republic (GDR) produced 32 -bit processor and is designed to make the computer then leading line of Digital Equipment Corporation, specifically the MicroVAX II, in the GDR available. The for U80700 - circuit system belonging processor was officially launched on 14 August 1989. The development of collective circuit system was awarded on October 6, 1989 with the National Prize of the GDR, First Class for Science and Technology.

At the Leipzig Spring Fair 1990 microprocessor was exhibited in a showcase of VEB Microelectronics " Karl Marx " Erfurt. On the part of the Soviet Union was interested before to the circuit as well as on the K 1820. It should be used in small computer Robotron K 1820, a replica of the MicroVAX II. From this system, 10 samples were built. After the turn of the processor U80701 was no longer manufactured in series production.

Architecture

The CPU was housed in a 68-pin flatpack plastic or ceramic package. The integrated memory management unit ( MMU) could be up to 16 MB of physical as well as up to 4 gigabytes of virtual address memory and support a 512-byte page -oriented protection mechanism and a management of access rights.

Programming was done about 175 machine instructions, 16 32 -bit wide general as well as 20 processor or internal registers. The CPU had a 62.4 -KB ROM with integrated 8-byte prefetch stack. The ROM contains a program to control flow. Address and data bus occupied the same pins, so here, the multiplexing method is used. Furthermore, it was possible to extend the CPU by an additional floating point unit.

For U80700 - processor system included the following circuits:

  • U80701: main processor ( CPU)
  • U80702: Reed-Solomon generator ( RSG )
  • U80703: floating point processor (FPU)
  • U80707: DIGITAL Link asynchronous receiver / transmitter ( DLART )
  • U80709: CPU interface gate array ( CIGA )
  • U80711: Bus Interface Gate Array ( OFIAMT )

The individual components of U80700 - circuit system were developed under the direction of combine microelectronics Erfurt in division of labor cooperation with the combines of Robotron and Carl Zeiss Jena ( Center for Microelectronics Dresden ) and the Central Institute of Cybernetics and Information Processes Berlin Academy of Sciences of the GDR. For example, Robotron Elektronik Dresden was ( Subject E9 and E5) tasked with the development of U80702, U80703 and U80707 to duty stapler contemporary patterns.

Data

Connections

Swell

  • Radio Amateur 38 (1989), H. 10, S. 473 (picture # 2).
  • Klaus Krakat: East German Kombinat developed the first native 32 -bit CPU. Computer Week No. 41, October 6, 1989.
  • Application Center Electronics: Microelectronics overview. (PDF, 1.1 MB) electronic info -Verlag, Berlin 1990, pp. 234-236.
  • Of authors: Technical Manual CPU KAC20. VEB Robotron Elektronik Dresden, December 1989.
Memory protection Machine code Read-only memory Floating-point unit Gate-Array ZMDI German Academy of Sciences at Berlin Volkseigener Betrieb
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