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Encyclopedia > NEC V20

The NEC V20 was a processor made by NEC that featured approximately 29,000 transistors. It was a reversed-engineered, pin-compatible version of an Intel 8088 processor (code compatible with the Intel 80186) that ran at 8 to 10 megahertz. The design was more efficient than the 8088 and caused the V20 to run 30% faster. The main feature that made it run faster was that it had hardware for multiplication, whereas the Intel chips had to do multiplication in microcode software. It was used in "turbo" versions of some PC clones such as Copam. A CPU The exact term processor is a sub-system of a data processing system which processes received information after it has been encoded into data by the input sub-system. ... NEC Corporation (Jp. ... Photo of transistor types (tape measure marked in centimeters) Transistor in the SMD form factor The transistor is a solid state semiconductor device used for amplification and switching. ... Reverse engineering (RE) is the process of taking something (a device, an electrical component, a software program, etc. ... An Intel 8088 Microprocessor The Intel 8088 is an Intel microprocessor based on the 8086, with 16-bit registers and an 8-bit external data bus. ... An Intel 80186 Microprocessor The 80186 architecture. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... A microprogram is a program consisting of microcode that controls the different parts of a computers central processing unit (CPU). ... A screenshot of computer software in action. ...


An unusual feature of the NEC V20 was that it added an 8080 emulation mode, in which it could execute programs written for the Intel 8080 processor. Intel C8080A processor. ...


The NEC V30 was a version of the NEC V20 that was pin compatible with the 16-bit Intel 8086 processor. An Intel 8086 Microprocessor The 8086 is a 16-bit microprocessor chip designed by Intel in 1978, which gave rise to the x86 architecture. ...


  Results from FactBites:
 
Molecular Expressions: Chip Shots - NEC (321 words)
NEC has manufactured telecommunications equipment for more than a century and is one of the oldest companies in the computer industry, having begun research into transistors in 1950 and into integrated circuits in 1960.
V20 (70K) - Partial die shot of the NEC V20 microprocessor showing thousands of bus connections on the corner of the chip using oblique illumination with blue, red, and yellow gels.
V20 (68K) - Partial die shot of the NEC V20 microprocessor showing the bus connections in the center of the chip using oblique illumination with blue and red gels.
What is NEC V20? V30 8086 8088 80186 Emulate Commands Tandy (227 words)
The NEC V20 was Nippon Electric Company's (NEC) first venture into reverse-engineering an Intel microprocessor chip instead of licensing the designs, as was common practice in the 1980s.
The NEC V20 was directly interchangeable with Intel's 8088 microprocessor line, and featured a die having 29,000 transistors and a clock speed of 8 to 10 MHz.
Although the NEC chips use the same set of commands as their Intel counterparts, they are not identical.
  More results at FactBites »

 
 

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