The J-11 is a

microprocessor A microprocessor is a computer processor where the data processing logic and control is included on a single integrated circuit, or a small number of integrated circuits. The microprocessor contains the arithmetic, logic, and control circu ...

chip set that implements the

PDP-11 The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all models were sold, ...

instruction set architecture In computer science, an instruction set architecture (ISA), also called computer architecture, is an abstract model of a computer. A device that executes instructions described by that ISA, such as a central processing unit (CPU), is called an ' ...

(ISA) jointly developed by

Digital Equipment Corporation Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president unt ...

and

Intersil Intersil is an American semiconductor company headquartered in Milpitas, California. As of February 24, 2017, Intersil is a subsidiary of Renesas. The previous Intersil was formed in August 1999 through the acquisition of the semiconductor busin ...

. It was a high-end chip set designed to integrate the performance and features of the

PDP-11/70 The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a set of products in the Programmed Data Processor (PDP) series. In total, around 600,000 PDP-11s of all models were sold ...

onto a handful of chips. It was used in the

PDP-11/73 The PDP-11/73 (strictly speaking, the MicroPDP-11/73) was the third generation of the PDP-11 series of 16-bit minicomputers produced by Digital Equipment Corporation to use LSI processors. Introduced in 1983, this system used the DEC J-11 chip set ...

, PDP-11/83 and Professional 380. It consisted of a data path chip and a control chip in ceramic leadless packages mounted on a single ceramic hybrid DIP package. The control chip incorporated a control sequencer and a microcode ROM. An optional separate floating-point accelerator (FPA) chip could be used, and was packaged in a standard DIP. The data path chip and control chip were fabricated by Intersil in a CMOS process while the FPA was fabricated by Digital in their "

ZMOS The V-11, code-named "Scorpio", is a miniprocessor chip set implementation of the VAX instruction set architecture (ISA) developed and fabricated by Digital Equipment Corporation (DEC). History The V-11 was Digital's first VAX microprocess ...

" NMOS process. The design originally was intended to support multiple control chips to allow implementation of additional instructions such as the Commercial Instruction Set (CIS), but no such control chips were ever offered. A clone of the J-11 was manufactured in the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...

under the designation KN1831VM1 (russian: КН1831ВМ1, italic=yes). File:J11_top.jpg, Top side of J-11 microprocessor hybrid. DC335 control chip on left, DC334 data path chip on right. US dime for scale. File:J11_bottom.jpg, Bottomside of J-11 microprocessor hybrid showing unused mounting positions for two additional control chips. File:DEC_Pro-380_CPU.jpg, J-11 on the motherboard of a DEC Professional 380. File:1831VM1.jpg, KN1831VM1: Soviet clone of the J-11. File:DEC_J-11_Control_chip_die.JPG, Die shot of DC335 control chip. File:DEC_J-11_Data_chip_die.JPG, Die shot of DC334 data path chip. File:DEC_J-11_FPA_die.JPG, Die shot of DC321 FPA chip.

References

{{Digital Equipment Corporation J-11 16-bit microprocessors