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	Molecular Expressions: Chip Shots - NEC
		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.
	micro.magnet.fsu.edu /chipshots/nec/index.html (321 words)

	What is NEC V20? V30 8086 8088 80186 Emulate Commands Tandy
		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.
	bugclub.org /beginners/processors/NEC-V20.html (227 words)

	NEC V20 - Wikipedia, the free encyclopedia
		The NEC V20 (μPD70108) was a processor made by NEC that featured approximately 29,000 transistors.
		An unusual feature of the NEC V20 was that it added an Intel 8080 emulation mode, in which it could execute programs written for the Intel 8080 processors.
		The NEC V30 (μPD70116) was a version of the NEC V20 that was pin compatible with the 16-bit data bus Intel 8086 processor.
	en.wikipedia.org /wiki/NEC_V20 (341 words)

	cpu-collection.de >> NEC >> V20
		The NEC V20 is a 16-bit CMOS microprocessor with 8-bit external data bus, object-code and pin-compatible with the Intel 8088.
		Native NEC V20 instruction set includes all 8086/8088 instructions, new instructions from the 80186/80188 microprocessor, and instructions unique to V20 - bit processing, packed BCD instructions and special instructions for switching the processor to 8080 emulation mode and back.
		The V20 is almost the same as the NEC V30 with the exception that the V30 has a 16-bit data bus.
	www.cpu-collection.de /?l0=co&l1=NEC&l2=V20 (198 words)

	[No title]
		NEC seeks to have such a ruling applied to several of the microsequences in the Intel microcode that are very short, involve only a few steps, and are handl ed almost identically in NEC's accused microcode and by Mr.
		Intel's rationale is that NEC normally would desire that the microcodes for the V20 and the V30 be able to operate in both microprocessors, and t hat it would have been preferable to create the hardware of the V20 without the bug and thus avoid the mistake found in the 8088.
		However, NEC had a license from Intel to duplicate the 8086/88 microprocessor hardware to the extent comprehended by the Intel patents.
	courses.cs.vt.edu /cs4984/computerlaw/nec.doc (6708 words)

	NEC@Everything2.com
		NEC has a product range of approximately 15.000 products (compared to Siemens who has almost 1.000.000 products) all over the world, and it ranges from satellite stations to microchips.
		The NEC group's turnover is almost 43 billions USD and this is generated by almost 155.000 employees who are working at approximately 250 companies all over the world (1996).
		NEC Corporation's domestic history began in 1963 when the first U.S. office was opened in New York City.
	everything2.com /index.pl?node=NEC (707 words)

	NOW, THE JAPANESE CHALLENGE IN MICROPROCESSORS Japan's largest chipmaker is moving fast to break the U.S. hammerlock on ...
		NEC, whose $1.8 billion in chip sales in 1984 made it Japan's biggest in the field, plans to seize a macro chunk of the market with micros of its own design and thus escape the costs, delays, and humiliations of having to license U.S. chips.
		NEC, Hitachi, and Fujitsu could follow suit by developing micros of their own design that are good enough to compete in the open market.
		NEC is going for broke: it has lined up Zilog in the U.S. and Sony in Japan as backup suppliers, introduced 11 peripheral chips to go with the V series, teamed up with Hewlett-Packard's Japanese subsidiary to make a development system, and signed deals with a gaggle of U.S. software houses.
	money.cnn.com /magazines/fortune/fortune_archive/1985/07/08/66112/index.htm (2657 words)

	[No title]
		NEC V20/V30 Bug Howard Vigorita New York Amateur Computer Club I recently saw a message from Jonathan Platt on a Florida bulletin board which mentioned rumors of a bug in the NEC V20/V30 processor.
		This is not a serious bug; the Intel register PUSH & POP instructions are duplicated in two sets of instructions and all the assemblers and compilers I've seen default to the shorter single byte set in favor of the two byte set.
		It is much simpler than the technique of issuing a unique NEC instruction and intercepting the error trap interrupt.
	www.textfiles.com /hamradio/v20_bug.txt (228 words)

	NEC V25 microcontroller family
		NEC V25 (uPD70320) is a microcontroller based on the NEC V20 microprocessor core.
		NEC V25+ (uPD70325) is an enhanced version of the V25.
		Although the NEC V25 and NEC V25+ are somewhat similar to Intel 80188 family, they are not compatible.
	www.cpu-world.com /CPUs/V25 (115 words)

	SorgoNet.com 8086
		There is an interesting thing to know on this processors is that there are 2 NEC processors that could substitute it to gain performance.
		Specifically the 8086 could be substituted for NEC-V30, and 8088 for NEC-V20, in both cases there are absolutely compatibles as in hardware as in software, they are processors who have been optimised, and in certain commands overcomes till 3 times the performance on its execution, also incorporates the additional 286 instructions in real mode.
		Then if you'd have a super-XT at home, the best for speed power is to substitute the processor by an NEC and to incorporate a 8087 mathematic coprocessor.
	www.sorgonet.com /8086/pcxtdescription (384 words)

	CodeBreakers-Journal - Portal for IT-Security & IT-Anti-Security - Processor Identification - Part II
		This should be used as another way (in addition to the one presented in the first article on this subject) to distinguish the NEC V20/V30 series from the Intel 8086/88.
		Since V20 and V30 execute all the 80186 instructions and knowing that PUSHA executed on the 8086/88 as "JMP $+2", one can for example, after executing it, set the carry flag and then see if it was really set.
		If we execute a string operation with a repeat prefix and also a segment override for long enough to be interrupted, then, if we are on a 8086/88 the REP prefix will be lost when the instruction is interrupted, since on return, only the last prefix will be retained.
	www.codebreakers-journal.com /content/view/229/104 (1918 words)

	Olympus MIC-D: Integrated Circuit Digital Image Gallery
		Although not apparent from the numerical identification, the R4000 was preceded by the R6000 processor, which was released in 1991.
		NEC V20 Microprocessor - 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.
		Pentium Processor - Representing the fifth generation of Intel microprocessors, the 64-bit Pentium, code-named the P5 during development, succeeded the widely renowned 80486 chip in 1993.
	www.olympusmicro.com /micd/galleries/chips/index.html (2948 words)

	NGASM 8086/8088 Assembler with 8086/8088 Instruction Set Documentation
		NEC was the first to "clone" the Intel 8088 and 8086 chips with their V20 and V30 designs.
		The V20 was pin-compatible with the 8088, while the V30 was pin-compatible with the 8086.
		The NEC V30 is almost the same as the NEC V20 with the exception that the V30 has a 16-bit external data bus.
	www.bestdiskrecovery.com /NGASM/index.html (1924 words)

	Olympus MIC-D: Integrated Circuit Gallery - Intel 8088 Microprocessor
		During its fledgling years, Intel had to have other, more established semiconductor manufacturers produce its chips like the 8088 since computer manufacturers such as IBM did not want to bet their entire personal computer line on an unproven entity.
		They later tired of simply licensing rights and designs from Intel and reverse-engineered the processor to create the NEC V20.
		The V20 was more efficient than the 8088 (increased clock speed), while maintaining complete compatibility and using the same command set as the 8088 processor.
	www.olympusmicro.com /micd/galleries/chips/intel8088a.html (385 words)

	CPU Guide: the first CPUs
		NEC was another of the licensed second-source producers of the 8086 and 8088, but was not content to simply reproduce: NEC wanted to improve the breed.
		The V20 is of interest because it was a faster 8088 (and the V30 the 8086) — the first clone CPU, if you like — and Intel's lawyers were not impressed about it.
		Eventually, NEC was given the go-ahead by the courts, but by then the 286 was the thing to have and it was too late for either NEC or the computer buying public to benefit much.
	redhill.net.au /c/c-1.html (2566 words)

	USENET News article: HP 95 LX programming tip
		NEC v20 80186 80286 G1 G2 assembly programming enter leave
		Going over the 95LX technical specifications, I found out that the CPU is not an Intel 8088, but a CMOS version of the NEC V20.
		The extra instructions generated by the compiler were: push integer shift with an integer count > 1 enter leave The V20 has some more exotic features such as the ability to emulate an 8080.
	www.spinellis.gr /news/89.html (220 words)

	[No title]
		Only the NEC V20 & V30, pin compatible with 8088 & 8086 respectively, are usually found in IBM compatible PCs.
		The V20 and V30 are often supplied as an "upgrade kit" for PCs originally equipped with an 88/86, as they execute most instructions in fewer clocks and can be used at a higher clock rate than the Intel parts.
		The NEC V20 and V30, as well as the 286+ CPUs use that encoding to indicate new instructions.
	www.textfiles.com /programming/86bugs.lst (10529 words)

	Personal Computer CHIPLIST 9.9.5 part 2 of 5
		NEC V35 CPU: extra instructions for register bank switches and task switches, packages: 84 pin PLCC (Plastic Leaded Chip Carrier), 94 pin QFP (Quad Flat Package), mPD70330, mPD70332.
		NEC V55 CPU: NEC V50 CPU, speeds up to 16 MHz.
		NEC V25 CPU: extra instructions for register bank switches and task switches, packages: 84 pin PLCC (Plastic Leaded Chip Carrier), 94 pin QFP (Quad Flat Package), mPD70320, mPD70322.
	www.faqs.org /faqs/pc-hardware-faq/chiplist/part2 (3644 words)

	NEC V25 - Wikipedia, the free encyclopedia
		NEC V20 core: 8-bit external data path, 20-bit address bus
		It was officially phased out by NEC in early 2003
		This page was last modified 01:12, 16 August 2006.
	en.wikipedia.org /wiki/NEC_V25 (64 words)

	The Intel 8086/88
		The NEC V20 and V30 are functionally similar to the 8088 and 8086, respectively, although they are slightly more efficient designs.
		In addition to the 8086 commands, the V20 and V30 include instructions Intel introduced with the 80186/88, a CPU that to my knowledge was only used in on PC - the Tandy 2000.
		A final benefit of the V20/V30 was the ability to fully emulate the older 8080 processor.
	lowendmac.com /lowendpc/tech/8086.shtml (843 words)

	WTD: NEC V20 Hardware Manual, IBM PC schematics
		Previous message: WTD: NEC V20 Hardware Manual, IBM PC schematics
		The V20 is supposed to be a drop-in > replacement, but IIRC it needed some (minor) BIOS alterations to get it to > work properly in PCs when the 8088 was swapped with a V20.
		The 'as good as possible' attitude of NEC was in my opinion the reason for the quite weired switching between 8088 and 8080 mode.
	www.classiccmp.org /pipermail/cctalk/2003-March/019071.html (288 words)

	Generic Decryptors
		The first two Uruguay viruses were written on a XT machine equipped with a NEC V20 processor.
		The NEC V20 processor was at that time a faster alternative for the 8088 processor, and many hobbyists had their Intel processor replaced by this NEC alternative.
		The NEC V20 processor is not completely equal to the 8088 processor, and the author of Uruguay was apparently not completely aware of this, so it happened that his first two creations only worked on a NEC V20 processor.
	vx.netlux.org /lib/static/vdat/epgencrp.htm (2789 words)

	80x86 Bug LIst
		ADD4S Addition of packed BCD strings (NEC V20/30 only) --------------------------------------------------------------------------- Mnemonic: ADD4S Opcode : 0F 20 (7+19n clocks, n is the number of bytes per operand) Bug in : Rarely documented, except in NEC manuals Function: Adds the packed BCD string at DS:SI to the packed BCD string at ES:DI.
		(V20 supplied by Robert Mashlan) (186 difference & 'CHKIND' supplied by Anthony Naggs) Breakpoint errors while debugging --------------------------------------------------------------------------- Mnemonic: N/A Opcode : N/A Bug in : some 386, some 486 Function: Breakpoints are used in the process of debugging programs.
		ROL4 Rotate left 4 bits (NEC V20/30 only) --------------------------------------------------------------------------- Mnemonic: ROL4 reg8/mem8 Opcode : 0F 28 [mod:000:r/m] (25/28 clocks) Bug in : Rarely documented, except in NEC manuals Function: Rotates a BCD digit (4 bits) left out of the operand, through the low 4 bits of AX.
	ivs.cs.uni-magdeburg.de /~zbrog/asm/86bugs.html (10521 words)

	CHIPLIST 9.9.5 by Aad Offerman, 1998/07/26
		NEC V35 CPU with 8086 emulation mode and security mode,
		Also made by Sony under license from NEC.
		NEC V25 CPU with 8086 emulation mode and security mode,
	burks.brighton.ac.uk /burks/pcinfo/hardware/chiplist.htm (5245 words)

	CP/M Welt [de]
		Since the tariff on AT compatibles is higher than XT compatibles the Japanese are introducing some very powerful XT class computers.
		They are using some of the newer Intel and NEC microprocessors such as the Intel 8088-1 (NEC V20--10), and the Intel 80186 (NEC V-40).
		The NEC V30 is also faster, but is also a 16 bit chip.
	www.cpmwelt.de /pool/ag/ag6508.htm (801 words)

	VIGLEN PICKS NEC V20 FOR UK PERSONALIKES - Computer Business Review
		Recently, Harlow-based distributor Akhter entered the market, and now it is the turn of Viglen Ltd. The VPC System Turbo range consists of four machines with the low-end model, the VPC 10M, with switchable 8/4.77MHz V20 processor, 256Kb RAM, 360Kb floppy, parallel port and mono monitor coming in at UKP499 excluding VAT.
		The VPC 100M uses the same processor but features 640Kb RAM, two 360Kb floppies, two serial and two parallel ports and a real time clock.
		Sign up to our weekly newsletters for the latest industry news and comment.
	www.cbronline.com /article_cg.asp?guid=A0E3DD21-1E4E-4C16-80F1-78608D67CD92 (251 words)

	8bit-Micro.com - Tandy Notebooks & Laptops
		Tandy's MS-DOS notebooks were based on the NEC V20
		popular NEC V20 processor clocked at 10 MHz.
		This was a heavy unit also based on the NEC
	www.8bit-micro.com /tandylap.htm (156 words)

	Intel 8088
		The 8088 offers performance less than one-thousandth that of a modern processor, showing just how far we have come in 15 years.
		Note: The NEC V20 is an 8088-compatible but actually delivers slightly better performance due to a slightly more efficient internal design.
		Note: The original design of this chip was in NMOS, with newer ones in CMOS (80C88) for lower power consumption.
	www.pcguide.com /ref/cpu/fam/g1I8088-c.html (307 words)

	CPU/FPU processor type
		Contributor: GREG VIGNEAULT (-------------------------------------------------------------------) UNIT CPUID; {CPUID.PAS} { determine CPU and FPU processor types } Interface { Copyright 1992 Gregory S. Vigneault } Const CpuType :Array[0..10] of String[7] = ('8088','8086','NEC V20', 'NEC V30','80186','80188','80286','386DX','386SX','486DX','486SX'); FpuType :Array[0..4] of String[5] = ('None','8087','80287','80387', '80487'); FUNCTION GetCPU(VAR FPUtype :BYTE) :BYTE; { GetCPU codes: 0 = 8088
		7 = 386DX or older/undetected 386SX 2 = NEC V20
		8 = 386SX * not always detected in all modes 3 = NEC V30
	www.csd.net /~cgadd/knowbase/HARDWARE0025.HTM (134 words)

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