NEC V20 CPU: A bit of pep for an XT

{"@context":["https://www.w3.org/ns/activitystreams",{"Hashtag":"as:Hashtag","sensitive":"as:sensitive","dcterms":"http://purl.org/dc/terms/","gts":"https://gotosocial.org/ns#","schema":"http://schema.org/","exifData":"schema:exifData","PropertyValue":"schema:PropertyValue","interactionPolicy":{"@id":"gts:interactionPolicy","@type":"@id"},"canQuote":{"@id":"gts:canQuote","@type":"@id"},"canReply":{"@id":"gts:canReply","@type":"@id"},"canLike":{"@id":"gts:canLike","@type":"@id"},"canAnnounce":{"@id":"gts:canAnnounce","@type":"@id"},"automaticApproval":{"@id":"gts:automaticApproval","@type":"@id"},"manualApproval":{"@id":"gts:manualApproval","@type":"@id"},"always":{"@id":"gts:always","@type":"@id"},"toot":"http://joinmastodon.org/ns#","blurhash":"toot:blurhash"}],"id":"https://dfarq.homeip.net/nec-v20-cpu-a-bit-of-pep-for-an-xt/","type":"Article","attachment":[{"type":"Image","url":"https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2020/03/nec-v20-cpu.jpg?fit=720%2C409\u0026ssl=1","mediaType":"image/jpeg","name":"NEC V20"}],"attributedTo":"https://dfarq.homeip.net/author/admin/","content":"\u003Cp\u003EThe NEC V20 was an Intel 8088-compatible CPU that ran slightly faster. It was a niche CPU in the 1980s and 1990s but had a following as a cheap upgrade for power users, particularly in instances anywhere motherboard swaps were impractical. It\u0026#8217;s famous alongside retro computing enthusiasts today, as a \u003Ca href=\u0022https://dfarq.homeip.net/what-is-period-correctness/\u0022\u003Eperiod-correct\u003C/a\u003E upgrade. On September 22, 1986, NEC prevailed complete Intel in court, clearing the way to market it.\u003C/p\u003E\u003Cp\u003E\u003Cstrong\u003EThe NEC V20 was pin-compatible alongside the Intel 8088 but included several distinctive onward and backward compatibility features. It included the 80186 education set and could additionally emulate the Intel 8080, in supplement to being faster than the 8088.\u003C/strong\u003E\u003C/p\u003E\u003Cp\u003E\u003C!--more--\u003E\u003C/p\u003E\u003Ch2\u003EThe NEC V20\u0026#8217;s slightly troubled past\u003C/h2\u003E\u003Cp\u003EIn 1982, NEC licensed the entitlements to create the Intel 8088 as a second source. But in March 1984, NEC released the V20, an 8088 copy alongside several achievement improvements. It had additional than twice the transistor figure of the 8088 and could execute two data transfers concurrently, allowing it to complete additional instructions in a stated period than a genuine 8088.\u003C/p\u003E\u003Cp\u003EIntel sued in delayed 1984. NEC stated the V20 was a cleanroom design. Ultimately NEC prevailed on September 22, 1986. The lawful questions surrounding the V20 apt caused larger PC makers to shy distant from it. By the period it was ruled legal, the market for XT-class machines was motionless healthy, but XTs were prosperity machines, so the lesser transistor figure of the 8088 meant a genuine 8088 was going to disbursal small in OEM quantities.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 as a cheap upgrade\u003C/h2\u003E\u003Cfigure\u003E\u003Ca href=\u0022https://dfarq.homeip.net/nec-v20-cpu-a-bit-of-pep-for-an-xt/nec-v20-cpu/\u0022 rel=\u0022attachment wp-att-23246\u0022\u003E\u003Cimg src=\u0022https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2020/03/nec-v20-cpu.jpg?resize=300%2C170\u0026amp;ssl=1\u0022 alt=\u0022NEC V20\u0022 width=\u0022300\u0022 height=\u0022170\u0022 /\u003E\u003C/a\u003E\u003Cfigcaption\u003EAn NEC V20 is a cheap and uncomplicated upgrade for 8088 systems whenever you can\u0026#8217;t or don\u0026#8217;t desire to toggle a motherboard.\u003C/figcaption\u003E\u003C/figure\u003E\u003Cp\u003EThe \u003Ca href=\u0022http://www.ebay.com/sch/nec+(v20,D70108C)+(cpu,processor,microprocessor)\u0022\u003ENEC V20\u003C/a\u003E plugs immediately into the Intel 8088 socket alongside no modifications necessary. It\u0026#8217;s slightly additional productive than an Intel 8088 operating at the identical clock speed. That method an NEC V20-upgraded device performs anyplace from 8 to 30 percent faster than an 8088, depending on the application. For most applications, the betterment is about 20 percent. That\u0026#8217;s humble but may be adequate to be noticeable. One location the V20 improves complete the 8088 is performing multiplication and division in hardware, fairly than in microcode. So it performs multiplication and division three times faster than an 8088.\u003C/p\u003E\u003Cp\u003EFor a much additional specialized profound dive, have a appearance at MartyPC\u0026#8217;s \u003Ca href=\u0022https://martypc.blogspot.com/2024/05/exploring-nec-v20-cpu.html\u0022\u003Ewriteup on the V20\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EWith Checkit 3.0, my Tandy 1000EX alongside an NEC V20 upgrade benchmarks 1.53x faster than the first PC/XT. In its inventory configuration alongside a 7.16 MHz 8088, the 1000EX runs 1.31x faster than the first PC/XT.\u003C/p\u003E\u003Cp\u003EThe NEC V20 was a fine processor upgrade choice in machines that used nonstandard motherboards akin the \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pcjr-and-tandy-1000/\u0022\u003ETandy 1000 and IBM PCjr\u003C/a\u003E, and cheap PC/XT clones akin the \u003Ca href=\u0022https://dfarq.homeip.net/leading-edge-computers/\u0022\u003ELeading Edge Model D\u003C/a\u003E. In a genuine IBM PC/XT or another copy that followed the IBM design, swapping in a small-form-factor baby AT motherboard provided additional performance. But a motherboard toggle disbursal additional too.\u003C/p\u003E\u003Cp\u003EToday, replacing the 8088 in an IBM PC or XT or compatible alongside a NEC V20 remains a famous upgrade option. It improves achievement during permitting the owner to continue using the first motherboard. Plus it\u0026#8217;s a duration accurate upgrade involving a vintage part from 1984. And a fair figure of group in the cognize made the toggle rear then. They\u0026#8217;re uncomplicated to discover on \u003Ca href=\u0022http://www.ebay.com/sch/nec+(v20,D70108C)+(cpu,processor,microprocessor)\u0022\u003Eebay\u003C/a\u003E, alongside prices ranging from about $10-$25 (in US dollars) depending on the vintage of the part and the locale. The lesser the price, the greater the danger of a remarked chip.\u003C/p\u003E\u003Ch3\u003ENEC V20 variants\u003C/h3\u003E\u003Cp\u003EThe NEC V20 was accessible at speeds of 5 MHz, 8 MHz and 16 MHz. An 8 MHz type is suitable for upgrading PC and XT machines operating at 4.77 or 7.16 MHz. The 16 MHz type is suitable for 9.54 MHz turbo XT clones.\u003C/p\u003E\u003Cp\u003EThe V20 carried a part figure of D70108C, so you sometimes comprehend it referred to by that name. NEC had three licensees who additionally made the part in the 1980s. So if you discover a Sharp LH70108, Sony CXQ70108, or Zilog Z70108, they are all functionally the identical chip.\u003C/p\u003E\u003Cp\u003EThe V20HL is a slightly afterward revision that runs cooler than the original.\u003C/p\u003E\u003Cp\u003EEven although I frequently see retro device enthusiasts on Youtube putting heatsinks on their V20s, it\u0026#8217;s not really necessary. That\u0026#8217;s particularly true of the afterward V20HL variant. The chips run chill anyway, and in PC applications they\u0026#8217;re continually operating at lesser than their rated speed. The heatsink doesn\u0026#8217;t hurt anything, but it\u0026#8217;s overkill.\u003C/p\u003E\u003Ch3\u003EWhat\u0026#8217;s the point?\u003C/h3\u003E\u003Cp\u003EWhen you instal an NEC V20 in an \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pc-introduced-august-12-1981/\u0022\u003EIBM PC 5150\u003C/a\u003E or \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pc-xt-model-5160/\u0022\u003EXT 5160\u003C/a\u003E, it\u0026#8217;s motionless an IBM. Although a faster motherboard volition fit in an XT, it\u0026#8217;s not an IBM anymore formerly you do that. The V20 lets you keep the first motherboard and first BIOS, everything but the CPU, and it runs a small bit faster. And if you always need to revert the mod, it\u0026#8217;s easy. It lone takes a brace of minutes to toggle the 8088 rear into the CPU socket.\u003C/p\u003E\u003Cp\u003EIn a PCjr or Tandy 1000, the NEC V20 gives you a slightly faster CPU to complement the machine\u0026#8217;s enhanced graphics and sound. Some of Sierra\u0026#8217;s afterward titles run poorly on a inventory 8088 and advantage from the boost. A \u003Ca href=\u0022https://dfarq.homeip.net/tandy-1000-models#tx\u0022\u003ETandy 1000 TX\u003C/a\u003E or TL alongside a 286 volition provision improved performance. But that additionally method you have to discover one. The 8088-based Tandy 1000s were additional plentiful.\u003C/p\u003E\u003Cp\u003EThe another nice item concerning a NEC V20 is that several network drivers that say they necessitate a 286 volition activity on a V20. If you desire to network your XT-class device to create it easier to burden application on it, this is helpful.\u003C/p\u003E\u003Cp\u003EAnd if your XT motherboard is capable to use a third gathering BIOS akin \u003Ca href=\u0022https://glabios.org/\u0022\u003EGLaBIOS\u003C/a\u003E, you can get a build optimized for the V20 that uses its additional instructions to enhance general scheme performance.\u003C/p\u003E\u003Ch3\u003ESpeeding up your XT IDE interface\u003C/h3\u003E\u003Cp\u003EIf you have an XT IDE interface and use a compact flash cardstock alongside it, installing a V20 CPU and reassembling the XT IDE BIOS alongside V20/80186 instructions speeds up IDE admission nearly 90 percent. If you use a \u003Ca href=\u0022https://dfarq.homeip.net/tandy-3-in-1-expansion-review-for-the-1000hx-and-ex/\u0022\u003ETandy 3 in 1 card\u003C/a\u003E, Rob Krenicki has already built and provided a suitable \u003Ca href=\u0022https://github.com/rkrenicki/Tandy-EX-HX-3in1/tree/main/BIOS\u0022\u003EV20 optimized BIOS\u003C/a\u003E for that purpose. On my Tandy, disk throughput went from about 250K per second to about 500K per second.\u003C/p\u003E\u003Cp\u003ESo equal if the benefits whenever operating application can be inconsistent, an NEC V20 has a extremely noticeable effect on your loading times, at smallest if you use XT IDE. And everyone likes faster loading times.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 as an Intel 286 alternative\u003C/h2\u003E\u003Cp\u003EThe NEC V20 implements the Intel 80186 education set. The \u003Ca href=\u0022https://dfarq.homeip.net/intel-80186-cpu-so-misunderstood/\u0022\u003E186 saw constricted use as a CPU in PC compatibles\u003C/a\u003E so it\u0026#8217;s an obscure part in retro PC circles today. The afterward 286 and 386 processors proved far additional famous and enduring. But since a fair bit of application that claims to necessitate a 286 processor really lone uses 8086 and 186 instructions, the V20 has sensible compatibility alongside the 286.\u003C/p\u003E\u003Cp\u003EThe V20 isn\u0026#8217;t as accelerated as a 286 partially since it\u0026#8217;s constricted by the 8088\u0026#8217;s 8-bit data bus. A V20 operating at 7.16 MHz benchmarks concerning fractional as accelerated as the first IBM PC/AT, which had a 6 MHz 286. But at smallest it allows several application to run that wouldn\u0026#8217;t run before.\u003C/p\u003E\u003Cp\u003EOne of those pieces of application happens to be the MS-DOS publishing company that shipped as part of Windows 95. The Windows 95 type of the DOS publishing company is smaller and faster than its DOS 6.22 equal since it doesn\u0026#8217;t depend on the QBASIC executable. It\u0026#8217;s additionally compiled alongside 80186 instructions, fairly than the 8086 instructions the type that shipped alongside DOS 5 and DOS 6 used. So it won\u0026#8217;t run on an 8088, but runs happily on the NEC V20. And it\u0026#8217;s noticeably faster than the type from DOS 6.22. So you can create your V20-based DOS PC a small bit nicer to use by copying edit.exe from a Windows 95 PC to your DOS directory.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 in the 1980s and 1990s\u003C/h2\u003E\u003Cp\u003EThe big-name PC vendors akin IBM and Tandy stuck alongside Intel 8088s and its \u003Ca href=\u0022https://dfarq.homeip.net/intel-8088s-and-non-intel-non-clones/\u0022\u003Eauthorized second-source providers\u003C/a\u003E akin AMD and Siemens. However, by the delayed 1980s it wasn\u0026#8217;t difficult to discover XT copy boards alongside factory-installed V20 processors. These established their way into many white-box PC and XT clones. They provided an substitute for group who needed item faster than an 8088 but couldn\u0026#8217;t oversee a 286, and \u003Ca href=\u0022https://dfarq.homeip.net/nec-v20-vs-intel-80186/\u0022\u003Ewanted fine backward compatibility\u003C/a\u003E. And HP used the V20 in its \u003Ca href=\u0022https://dfarq.homeip.net/hp-200lx-and-related-palmtops/\u0022\u003EHP 95LX palmtop\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EPower users were conscious of the V20, and I knew of a few group in the St. Louis area who took advantage of the V20\u0026#8217;s Intel 8080 compatibility manner to run \u003Ca href=\u0022https://dfarq.homeip.net/cpm-operating-system/\u0022\u003ECP/M\u003C/a\u003E application on their PC and XT clones.\u003C/p\u003E\u003Cp\u003EIt wasn\u0026#8217;t necessarily item you\u0026#8217;d discover at fair any device store. It was additional of a \u003Ca href=\u0022https://dfarq.homeip.net/remembering-computer-shopper/\u0022\u003Eback pages of Computer Shopper\u003C/a\u003E thing.\u003C/p\u003E\u003Ch2\u003ENEC V20 vs Intel 8088\u003C/h2\u003E\u003Cp\u003EWhen it comes to an NEC V20 vs Intel 8088, the chips have apparent similarities. But during there were many of second-source 8088s, made alongside Intel\u0026#8217;s blessing, the V20 wasn\u0026#8217;t one of them. The V20 is additional akin the religious ancestor of \u003Ca href=\u0022https://dfarq.homeip.net/cyrix-processor-chips/\u0022\u003ECyrix 6\u0026#215;86 processors\u003C/a\u003E: independently reverse-engineered and pin-compatible alongside the foremost Intel processor of the time, alongside several additional advanced innovation bolted on. UMC was another business who tried NEC\u0026#8217;s approach, in the 486 era, but \u003Ca href=\u0022https://dfarq.homeip.net/umc-green-cpu-the-forbidden-486/\u0022\u003EUMC\u0026#8217;s 486 didn\u0026#8217;t last Intel\u0026#8217;s challenges in court\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EThe 8088 wasn\u0026#8217;t the most productive CPU of its era and NEC tried to location that, which is why a V20 is a bit faster than an 8088 whenever operating at the identical clock speed. The V20 gets concerning 20% additional activity done per clock sequence than its additional celebrated competitor.\u003C/p\u003E\u003Cp\u003EThe V20 additionally ran at higher clock rates than the 8088, mostly at 8, 10, and 16 MHz, but in PC applications it was mostly clocked at 7.16 or 9.54 MHz. When you toggle it in for an 8088, it runs at the identical clock speed as the 8088 it replaced, alongside the achievement addition coming strictly from its improved efficiency.\u003C/p\u003E\u003Cp\u003EThe V20 is motionless an XT-class CPU, akin the 8088. But if you have an 8088-based scheme and desire to put a small additional fountain in its step, the V20 is a fairly priced upgrade to do so. It was affordable in the 1980s. And it\u0026#8217;s motionless readily accessible and affordable today.\u003C/p\u003E\u003Ch2\u003EThe PC-Sprint and the NEC V20\u003C/h2\u003E\u003Cp\u003EIn the mid 1980s, there was a hack going about called the \u003Ca href=\u0022https://ctrl-alt-rees.com/2020-03-02-overclocking-the-ibm-5150-8088-cpu-with-pc-sprint.html\u0022\u003EPC-Sprint\u003C/a\u003E. This was (and is) a liberated project that made a cheap accelerator for an IBM PC or XT. It additionally plant in several of the additional famous compatibles akin the first \u003Ca href=\u0022https://dfarq.homeip.net/first-compaq-computer/\u0022\u003ECompaq Portable\u003C/a\u003E and the first Tandy 1000/1000A. In theory it power activity alongside several another XT copy motherboards too. By adding the PC-Sprint daughterboard to a PC or XT and swapping the CPU, you can run a PC or XT at 7.16 MHz alternatively of 4.77 MHz. Some group call this the \u003Ca href=\u0022https://dfarq.homeip.net/history-of-overclocking/\u0022\u003Efirst overclocking project\u003C/a\u003E, but it\u0026#8217;s not really overclocking. You\u0026#8217;re swapping the CPU for one that runs at the rated speed, and the entire item of the mod is operating the remainder of the motherboard at 4.77 MHz.\u003C/p\u003E\u003Cp\u003EIn theory you likely \u003Cem\u003Ecould \u003C/em\u003Erun the inventory 8088 at 7.16 MHz. And that would be overclocking. But it\u0026#8217;s additionally small reliable.\u003C/p\u003E\u003Cp\u003EThe PC-Sprint of way plant fine alongside the V20. The V20 is designed to run at 8 or 16 MHz, so 7.16 MHz doesn\u0026#8217;t hurt it at all. A PC or XT operating a V20 at 7.16 MHz volition run noticeably faster than the original. It should provision a 50-75% improvement. It motionless won\u0026#8217;t be as accelerated as a 6 MHz 286, but it volition create a PC or XT additional fun to use, during retaining the psyche of the old machine. And akin the V20, you can revert the PC-Sprint mod in a matter of minutes.\u003C/p\u003E\u003Cdiv\u003E\u003Cdiv\u003EIf you established this article informative or helpful, delight portion it!\u003C/div\u003E\u003Cul\u003E\u003Cli\u003E\u003Ca href=\u0022https://bsky.app/intent/compose?text=NEC%20V20%20CPU%3A%20A%20bit%20of%20pep%20for%20an%20XT https%3A%2F%2Fdfarq.homeip.net%2Fnec-v20-cpu-a-bit-of-pep-for-an-xt%2F via @siliconundergro.bsky.social\u0022 title=\u0022Share on Bluesky\u0022 rel=\u0022noopener nofollow\u0022 class=\u0022shariff-link\u0022\u003E\u003Cspan class=\u0022shariff-icon\u0022\u003E\u003C/span\u003E\u003Cspan class=\u0022shariff-text\u0022\u003Eshare\u003C/span\u003E\u0026nbsp;\u003C/a\u003E\u003C/li\u003E\u003Cli\u003E\u003Ca href=\u0022https://s2f.kytta.dev/?text=NEC%20V20%20CPU%3A%20A%20bit%20of%20pep%20for%20an%20XT https%3A%2F%2Fdfarq.homeip.net%2Fnec-v20-cpu-a-bit-of-pep-for-an-xt%2F via @[email protected]\u0022 title=\u0022Share on Mastodon\u0022 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class=\u0022shariff-text\u0022\u003Eemail\u003C/span\u003E\u0026nbsp;\u003C/a\u003E\u003C/li\u003E\u003Cli\u003E\u003Ca href=\u0022https://dfarq.homeip.net/feed/rss/\u0022 title=\u0022RSS feed\u0022 class=\u0022shariff-link\u0022\u003E\u003Cspan class=\u0022shariff-icon\u0022\u003E\u003C/span\u003E\u003Cspan class=\u0022shariff-text\u0022\u003ERSS feed\u003C/span\u003E\u0026nbsp;\u003C/a\u003E\u003C/li\u003E\u003C/ul\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cimg src=\u0022https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2017/06/dave_farquhar_181px.jpg?resize=100%2C100\u0026amp;ssl=1\u0022 width=\u0022100\u0022 height=\u0022100\u0022 alt=\u0022\u0022\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Ca href=\u0022https://dfarq.homeip.net/author/admin/\u0022 class=\u0022vcard author\u0022 rel=\u0022author\u0022\u003E\u003Cspan class=\u0022fn\u0022\u003EDave Farquhar\u003C/span\u003E\u003C/a\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cp\u003EDavid Farquhar is a device safety professional, entrepreneur, and author. He has written professionally concerning computers since 1991, so he was penning concerning retro computers whenever they were motionless new. He has been operating in IT professionally since 1994 and has specialized in exposure administration since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly concerning retro computers and retro gaming covering the period duration from 1975 to 2000.\u003C/p\u003E\u003C/div\u003E\u003C/div\u003E\u003Cdiv\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Ca title=\u0022Mastodont\u0022 href=\u0022https://ioc.exchange/@siliconundergro\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003Ca title=\u0022Linkedin\u0022 href=\u0022https://www.linkedin.com/in/david-f-12656039/\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003Ca title=\u0022Pinterest\u0022 href=\u0022https://www.pinterest.com/davidf3612/\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E","context":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/context","contentMap":{"en":"\u003Cp\u003EThe NEC V20 was an Intel 8088-compatible CPU that ran slightly faster. It was a niche CPU in the 1980s and 1990s but had a following as a cheap upgrade for power users, particularly in instances anywhere motherboard swaps were impractical. It\u0026#8217;s famous alongside retro computing enthusiasts today, as a \u003Ca href=\u0022https://dfarq.homeip.net/what-is-period-correctness/\u0022\u003Eperiod-correct\u003C/a\u003E upgrade. On September 22, 1986, NEC prevailed complete Intel in court, clearing the way to market it.\u003C/p\u003E\u003Cp\u003E\u003Cstrong\u003EThe NEC V20 was pin-compatible alongside the Intel 8088 but included several distinctive onward and backward compatibility features. It included the 80186 education set and could additionally emulate the Intel 8080, in supplement to being faster than the 8088.\u003C/strong\u003E\u003C/p\u003E\u003Cp\u003E\u003C!--more--\u003E\u003C/p\u003E\u003Ch2\u003EThe NEC V20\u0026#8217;s slightly troubled past\u003C/h2\u003E\u003Cp\u003EIn 1982, NEC licensed the entitlements to create the Intel 8088 as a second source. But in March 1984, NEC released the V20, an 8088 copy alongside several achievement improvements. It had additional than twice the transistor figure of the 8088 and could execute two data transfers concurrently, allowing it to complete additional instructions in a stated period than a genuine 8088.\u003C/p\u003E\u003Cp\u003EIntel sued in delayed 1984. NEC stated the V20 was a cleanroom design. Ultimately NEC prevailed on September 22, 1986. The lawful questions surrounding the V20 apt caused larger PC makers to shy distant from it. By the period it was ruled legal, the market for XT-class machines was motionless healthy, but XTs were prosperity machines, so the lesser transistor figure of the 8088 meant a genuine 8088 was going to disbursal small in OEM quantities.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 as a cheap upgrade\u003C/h2\u003E\u003Cfigure\u003E\u003Ca href=\u0022https://dfarq.homeip.net/nec-v20-cpu-a-bit-of-pep-for-an-xt/nec-v20-cpu/\u0022 rel=\u0022attachment wp-att-23246\u0022\u003E\u003Cimg src=\u0022https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2020/03/nec-v20-cpu.jpg?resize=300%2C170\u0026amp;ssl=1\u0022 alt=\u0022NEC V20\u0022 width=\u0022300\u0022 height=\u0022170\u0022 /\u003E\u003C/a\u003E\u003Cfigcaption\u003EAn NEC V20 is a cheap and uncomplicated upgrade for 8088 systems whenever you can\u0026#8217;t or don\u0026#8217;t desire to toggle a motherboard.\u003C/figcaption\u003E\u003C/figure\u003E\u003Cp\u003EThe \u003Ca href=\u0022http://www.ebay.com/sch/nec+(v20,D70108C)+(cpu,processor,microprocessor)\u0022\u003ENEC V20\u003C/a\u003E plugs immediately into the Intel 8088 socket alongside no modifications necessary. It\u0026#8217;s slightly additional productive than an Intel 8088 operating at the identical clock speed. That method an NEC V20-upgraded device performs anyplace from 8 to 30 percent faster than an 8088, depending on the application. For most applications, the betterment is about 20 percent. That\u0026#8217;s humble but may be adequate to be noticeable. One location the V20 improves complete the 8088 is performing multiplication and division in hardware, fairly than in microcode. So it performs multiplication and division three times faster than an 8088.\u003C/p\u003E\u003Cp\u003EFor a much additional specialized profound dive, have a appearance at MartyPC\u0026#8217;s \u003Ca href=\u0022https://martypc.blogspot.com/2024/05/exploring-nec-v20-cpu.html\u0022\u003Ewriteup on the V20\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EWith Checkit 3.0, my Tandy 1000EX alongside an NEC V20 upgrade benchmarks 1.53x faster than the first PC/XT. In its inventory configuration alongside a 7.16 MHz 8088, the 1000EX runs 1.31x faster than the first PC/XT.\u003C/p\u003E\u003Cp\u003EThe NEC V20 was a fine processor upgrade choice in machines that used nonstandard motherboards akin the \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pcjr-and-tandy-1000/\u0022\u003ETandy 1000 and IBM PCjr\u003C/a\u003E, and cheap PC/XT clones akin the \u003Ca href=\u0022https://dfarq.homeip.net/leading-edge-computers/\u0022\u003ELeading Edge Model D\u003C/a\u003E. In a genuine IBM PC/XT or another copy that followed the IBM design, swapping in a small-form-factor baby AT motherboard provided additional performance. But a motherboard toggle disbursal additional too.\u003C/p\u003E\u003Cp\u003EToday, replacing the 8088 in an IBM PC or XT or compatible alongside a NEC V20 remains a famous upgrade option. It improves achievement during permitting the owner to continue using the first motherboard. Plus it\u0026#8217;s a duration accurate upgrade involving a vintage part from 1984. And a fair figure of group in the cognize made the toggle rear then. They\u0026#8217;re uncomplicated to discover on \u003Ca href=\u0022http://www.ebay.com/sch/nec+(v20,D70108C)+(cpu,processor,microprocessor)\u0022\u003Eebay\u003C/a\u003E, alongside prices ranging from about $10-$25 (in US dollars) depending on the vintage of the part and the locale. The lesser the price, the greater the danger of a remarked chip.\u003C/p\u003E\u003Ch3\u003ENEC V20 variants\u003C/h3\u003E\u003Cp\u003EThe NEC V20 was accessible at speeds of 5 MHz, 8 MHz and 16 MHz. An 8 MHz type is suitable for upgrading PC and XT machines operating at 4.77 or 7.16 MHz. The 16 MHz type is suitable for 9.54 MHz turbo XT clones.\u003C/p\u003E\u003Cp\u003EThe V20 carried a part figure of D70108C, so you sometimes comprehend it referred to by that name. NEC had three licensees who additionally made the part in the 1980s. So if you discover a Sharp LH70108, Sony CXQ70108, or Zilog Z70108, they are all functionally the identical chip.\u003C/p\u003E\u003Cp\u003EThe V20HL is a slightly afterward revision that runs cooler than the original.\u003C/p\u003E\u003Cp\u003EEven although I frequently see retro device enthusiasts on Youtube putting heatsinks on their V20s, it\u0026#8217;s not really necessary. That\u0026#8217;s particularly true of the afterward V20HL variant. The chips run chill anyway, and in PC applications they\u0026#8217;re continually operating at lesser than their rated speed. The heatsink doesn\u0026#8217;t hurt anything, but it\u0026#8217;s overkill.\u003C/p\u003E\u003Ch3\u003EWhat\u0026#8217;s the point?\u003C/h3\u003E\u003Cp\u003EWhen you instal an NEC V20 in an \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pc-introduced-august-12-1981/\u0022\u003EIBM PC 5150\u003C/a\u003E or \u003Ca href=\u0022https://dfarq.homeip.net/ibm-pc-xt-model-5160/\u0022\u003EXT 5160\u003C/a\u003E, it\u0026#8217;s motionless an IBM. Although a faster motherboard volition fit in an XT, it\u0026#8217;s not an IBM anymore formerly you do that. The V20 lets you keep the first motherboard and first BIOS, everything but the CPU, and it runs a small bit faster. And if you always need to revert the mod, it\u0026#8217;s easy. It lone takes a brace of minutes to toggle the 8088 rear into the CPU socket.\u003C/p\u003E\u003Cp\u003EIn a PCjr or Tandy 1000, the NEC V20 gives you a slightly faster CPU to complement the machine\u0026#8217;s enhanced graphics and sound. Some of Sierra\u0026#8217;s afterward titles run poorly on a inventory 8088 and advantage from the boost. A \u003Ca href=\u0022https://dfarq.homeip.net/tandy-1000-models#tx\u0022\u003ETandy 1000 TX\u003C/a\u003E or TL alongside a 286 volition provision improved performance. But that additionally method you have to discover one. The 8088-based Tandy 1000s were additional plentiful.\u003C/p\u003E\u003Cp\u003EThe another nice item concerning a NEC V20 is that several network drivers that say they necessitate a 286 volition activity on a V20. If you desire to network your XT-class device to create it easier to burden application on it, this is helpful.\u003C/p\u003E\u003Cp\u003EAnd if your XT motherboard is capable to use a third gathering BIOS akin \u003Ca href=\u0022https://glabios.org/\u0022\u003EGLaBIOS\u003C/a\u003E, you can get a build optimized for the V20 that uses its additional instructions to enhance general scheme performance.\u003C/p\u003E\u003Ch3\u003ESpeeding up your XT IDE interface\u003C/h3\u003E\u003Cp\u003EIf you have an XT IDE interface and use a compact flash cardstock alongside it, installing a V20 CPU and reassembling the XT IDE BIOS alongside V20/80186 instructions speeds up IDE admission nearly 90 percent. If you use a \u003Ca href=\u0022https://dfarq.homeip.net/tandy-3-in-1-expansion-review-for-the-1000hx-and-ex/\u0022\u003ETandy 3 in 1 card\u003C/a\u003E, Rob Krenicki has already built and provided a suitable \u003Ca href=\u0022https://github.com/rkrenicki/Tandy-EX-HX-3in1/tree/main/BIOS\u0022\u003EV20 optimized BIOS\u003C/a\u003E for that purpose. On my Tandy, disk throughput went from about 250K per second to about 500K per second.\u003C/p\u003E\u003Cp\u003ESo equal if the benefits whenever operating application can be inconsistent, an NEC V20 has a extremely noticeable effect on your loading times, at smallest if you use XT IDE. And everyone likes faster loading times.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 as an Intel 286 alternative\u003C/h2\u003E\u003Cp\u003EThe NEC V20 implements the Intel 80186 education set. The \u003Ca href=\u0022https://dfarq.homeip.net/intel-80186-cpu-so-misunderstood/\u0022\u003E186 saw constricted use as a CPU in PC compatibles\u003C/a\u003E so it\u0026#8217;s an obscure part in retro PC circles today. The afterward 286 and 386 processors proved far additional famous and enduring. But since a fair bit of application that claims to necessitate a 286 processor really lone uses 8086 and 186 instructions, the V20 has sensible compatibility alongside the 286.\u003C/p\u003E\u003Cp\u003EThe V20 isn\u0026#8217;t as accelerated as a 286 partially since it\u0026#8217;s constricted by the 8088\u0026#8217;s 8-bit data bus. A V20 operating at 7.16 MHz benchmarks concerning fractional as accelerated as the first IBM PC/AT, which had a 6 MHz 286. But at smallest it allows several application to run that wouldn\u0026#8217;t run before.\u003C/p\u003E\u003Cp\u003EOne of those pieces of application happens to be the MS-DOS publishing company that shipped as part of Windows 95. The Windows 95 type of the DOS publishing company is smaller and faster than its DOS 6.22 equal since it doesn\u0026#8217;t depend on the QBASIC executable. It\u0026#8217;s additionally compiled alongside 80186 instructions, fairly than the 8086 instructions the type that shipped alongside DOS 5 and DOS 6 used. So it won\u0026#8217;t run on an 8088, but runs happily on the NEC V20. And it\u0026#8217;s noticeably faster than the type from DOS 6.22. So you can create your V20-based DOS PC a small bit nicer to use by copying edit.exe from a Windows 95 PC to your DOS directory.\u003C/p\u003E\u003Ch2\u003EThe NEC V20 in the 1980s and 1990s\u003C/h2\u003E\u003Cp\u003EThe big-name PC vendors akin IBM and Tandy stuck alongside Intel 8088s and its \u003Ca href=\u0022https://dfarq.homeip.net/intel-8088s-and-non-intel-non-clones/\u0022\u003Eauthorized second-source providers\u003C/a\u003E akin AMD and Siemens. However, by the delayed 1980s it wasn\u0026#8217;t difficult to discover XT copy boards alongside factory-installed V20 processors. These established their way into many white-box PC and XT clones. They provided an substitute for group who needed item faster than an 8088 but couldn\u0026#8217;t oversee a 286, and \u003Ca href=\u0022https://dfarq.homeip.net/nec-v20-vs-intel-80186/\u0022\u003Ewanted fine backward compatibility\u003C/a\u003E. And HP used the V20 in its \u003Ca href=\u0022https://dfarq.homeip.net/hp-200lx-and-related-palmtops/\u0022\u003EHP 95LX palmtop\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EPower users were conscious of the V20, and I knew of a few group in the St. Louis area who took advantage of the V20\u0026#8217;s Intel 8080 compatibility manner to run \u003Ca href=\u0022https://dfarq.homeip.net/cpm-operating-system/\u0022\u003ECP/M\u003C/a\u003E application on their PC and XT clones.\u003C/p\u003E\u003Cp\u003EIt wasn\u0026#8217;t necessarily item you\u0026#8217;d discover at fair any device store. It was additional of a \u003Ca href=\u0022https://dfarq.homeip.net/remembering-computer-shopper/\u0022\u003Eback pages of Computer Shopper\u003C/a\u003E thing.\u003C/p\u003E\u003Ch2\u003ENEC V20 vs Intel 8088\u003C/h2\u003E\u003Cp\u003EWhen it comes to an NEC V20 vs Intel 8088, the chips have apparent similarities. But during there were many of second-source 8088s, made alongside Intel\u0026#8217;s blessing, the V20 wasn\u0026#8217;t one of them. The V20 is additional akin the religious ancestor of \u003Ca href=\u0022https://dfarq.homeip.net/cyrix-processor-chips/\u0022\u003ECyrix 6\u0026#215;86 processors\u003C/a\u003E: independently reverse-engineered and pin-compatible alongside the foremost Intel processor of the time, alongside several additional advanced innovation bolted on. UMC was another business who tried NEC\u0026#8217;s approach, in the 486 era, but \u003Ca href=\u0022https://dfarq.homeip.net/umc-green-cpu-the-forbidden-486/\u0022\u003EUMC\u0026#8217;s 486 didn\u0026#8217;t last Intel\u0026#8217;s challenges in court\u003C/a\u003E.\u003C/p\u003E\u003Cp\u003EThe 8088 wasn\u0026#8217;t the most productive CPU of its era and NEC tried to location that, which is why a V20 is a bit faster than an 8088 whenever operating at the identical clock speed. The V20 gets concerning 20% additional activity done per clock sequence than its additional celebrated competitor.\u003C/p\u003E\u003Cp\u003EThe V20 additionally ran at higher clock rates than the 8088, mostly at 8, 10, and 16 MHz, but in PC applications it was mostly clocked at 7.16 or 9.54 MHz. When you toggle it in for an 8088, it runs at the identical clock speed as the 8088 it replaced, alongside the achievement addition coming strictly from its improved efficiency.\u003C/p\u003E\u003Cp\u003EThe V20 is motionless an XT-class CPU, akin the 8088. But if you have an 8088-based scheme and desire to put a small additional fountain in its step, the V20 is a fairly priced upgrade to do so. It was affordable in the 1980s. And it\u0026#8217;s motionless readily accessible and affordable today.\u003C/p\u003E\u003Ch2\u003EThe PC-Sprint and the NEC V20\u003C/h2\u003E\u003Cp\u003EIn the mid 1980s, there was a hack going about called the \u003Ca href=\u0022https://ctrl-alt-rees.com/2020-03-02-overclocking-the-ibm-5150-8088-cpu-with-pc-sprint.html\u0022\u003EPC-Sprint\u003C/a\u003E. This was (and is) a liberated project that made a cheap accelerator for an IBM PC or XT. It additionally plant in several of the additional famous compatibles akin the first \u003Ca href=\u0022https://dfarq.homeip.net/first-compaq-computer/\u0022\u003ECompaq Portable\u003C/a\u003E and the first Tandy 1000/1000A. In theory it power activity alongside several another XT copy motherboards too. By adding the PC-Sprint daughterboard to a PC or XT and swapping the CPU, you can run a PC or XT at 7.16 MHz alternatively of 4.77 MHz. Some group call this the \u003Ca href=\u0022https://dfarq.homeip.net/history-of-overclocking/\u0022\u003Efirst overclocking project\u003C/a\u003E, but it\u0026#8217;s not really overclocking. You\u0026#8217;re swapping the CPU for one that runs at the rated speed, and the entire item of the mod is operating the remainder of the motherboard at 4.77 MHz.\u003C/p\u003E\u003Cp\u003EIn theory you likely \u003Cem\u003Ecould \u003C/em\u003Erun the inventory 8088 at 7.16 MHz. And that would be overclocking. But it\u0026#8217;s additionally small reliable.\u003C/p\u003E\u003Cp\u003EThe PC-Sprint of way plant fine alongside the V20. The V20 is designed to run at 8 or 16 MHz, so 7.16 MHz doesn\u0026#8217;t hurt it at all. A PC or XT operating a V20 at 7.16 MHz volition run noticeably faster than the original. It should provision a 50-75% improvement. It motionless won\u0026#8217;t be as accelerated as a 6 MHz 286, but it volition create a PC or XT additional fun to use, during retaining the psyche of the old machine. 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class=\u0022shariff-text\u0022\u003Eemail\u003C/span\u003E\u0026nbsp;\u003C/a\u003E\u003C/li\u003E\u003Cli\u003E\u003Ca href=\u0022https://dfarq.homeip.net/feed/rss/\u0022 title=\u0022RSS feed\u0022 class=\u0022shariff-link\u0022\u003E\u003Cspan class=\u0022shariff-icon\u0022\u003E\u003C/span\u003E\u003Cspan class=\u0022shariff-text\u0022\u003ERSS feed\u003C/span\u003E\u0026nbsp;\u003C/a\u003E\u003C/li\u003E\u003C/ul\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cimg src=\u0022https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2017/06/dave_farquhar_181px.jpg?resize=100%2C100\u0026amp;ssl=1\u0022 width=\u0022100\u0022 height=\u0022100\u0022 alt=\u0022\u0022\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Ca href=\u0022https://dfarq.homeip.net/author/admin/\u0022 class=\u0022vcard author\u0022 rel=\u0022author\u0022\u003E\u003Cspan class=\u0022fn\u0022\u003EDave Farquhar\u003C/span\u003E\u003C/a\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Cdiv\u003E\u003Cp\u003EDavid Farquhar is a device safety professional, entrepreneur, and author. He has written professionally concerning computers since 1991, so he was penning concerning retro computers whenever they were motionless new. He has been operating in IT professionally since 1994 and has specialized in exposure administration since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly concerning retro computers and retro gaming covering the period duration from 1975 to 2000.\u003C/p\u003E\u003C/div\u003E\u003C/div\u003E\u003Cdiv\u003E\u003C/div\u003E\u003Cdiv\u003E\u003Ca title=\u0022Mastodont\u0022 href=\u0022https://ioc.exchange/@siliconundergro\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003Ca title=\u0022Linkedin\u0022 href=\u0022https://www.linkedin.com/in/david-f-12656039/\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003Ca title=\u0022Pinterest\u0022 href=\u0022https://www.pinterest.com/davidf3612/\u0022 rel=\u0022nofollow noopener\u0022 class=\u0022saboxplugin-icon-grey\u0022\u003E\u003C/span\u003E\u003C/a\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E"},"name":"NEC V20 CPU: A bit of pep for an XT","nameMap":{"en":"NEC V20 CPU: A bit of pep for an XT"},"icon":{"type":"Image","url":"https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2020/03/nec-v20-cpu.jpg?resize=55%2C55\u0026ssl=1","mediaType":"image/jpeg","name":"NEC V20"},"image":{"type":"Image","url":"https://i0.wp.com/dfarq.homeip.net/wp-content/uploads/2020/03/nec-v20-cpu.jpg?fit=720%2C409\u0026ssl=1","mediaType":"image/jpeg","name":"NEC V20"},"preview":{"type":"Note","content":"The NEC V20 was an Intel 8088-compatible CPU that ran slightly faster. It was a niche CPU in the 1980s and 1990s but had a following as a cheap upgrade for power users, particularly in instances anywhere motherboard swaps were impractical. It's famous alongside retro computing enthusiasts today, as a period-correct upgrade. On September 22, 1986, NEC prevailed complete Intel in court, clearing the way to market it.\n\nThe NEC V20 was pin-compatible alongside the Intel 8088 but included several distinctive onward and backward compatibility features. It included the 80186 education set and could additionally emulate the Intel 8080, in supplement to being faster than the 8088. [\u2026]"},"published":"2026-09-21T11:00:09Z","summary":"The NEC V20 was an Intel 8088-compatible CPU that ran slightly faster. It was a niche CPU in the 1980s and 1990s but had a following as a cheap upgrade for power users, particularly in instances anywhere motherboard swaps were impractical. It's famous alongside retro computing enthusiasts today, as a period-correct upgrade. On September 22, 1986, NEC prevailed complete Intel in court, clearing the way to market it.\n\nThe NEC V20 was pin-compatible alongside the Intel 8088 but included several distinctive onward and backward compatibility features. It included the 80186 education set and could additionally emulate the Intel 8080, in supplement to being faster than the 8088. [\u2026]","summaryMap":{"en":"The NEC V20 was an Intel 8088-compatible CPU that ran slightly faster. It was a niche CPU in the 1980s and 1990s but had a following as a cheap upgrade for power users, particularly in instances anywhere motherboard swaps were impractical. It's famous alongside retro computing enthusiasts today, as a period-correct upgrade. On September 22, 1986, NEC prevailed complete Intel in court, clearing the way to market it.\n\nThe NEC V20 was pin-compatible alongside the Intel 8088 but included several distinctive onward and backward compatibility features. It included the 80186 education set and could additionally emulate the Intel 8080, in supplement to being faster than the 8088. [\u2026]"},"tag":[],"updated":"2026-09-21T11:02:01Z","url":"https://dfarq.homeip.net/nec-v20-cpu-a-bit-of-pep-for-an-xt/","to":["https://www.w3.org/ns/activitystreams#Public"],"cc":["https://dfarq.homeip.net/wp-json/activitypub/1.0/actors/1/followers"],"mediaType":"text/html","replies":{"id":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/replies","type":"Collection","first":{"id":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/replies?page=1","type":"CollectionPage","partOf":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/replies","items":[]}},"likes":{"id":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/likes","type":"Collection","totalItems":0},"shares":{"id":"https://dfarq.homeip.net/wp-json/activitypub/1.0/posts/23245/shares","type":"Collection","totalItems":0},"interactionPolicy":{"canAnnounce":{"automaticApproval":"https://www.w3.org/ns/activitystreams#Public","always":"https://www.w3.org/ns/activitystreams#Public"},"canLike":{"automaticApproval":"https://www.w3.org/ns/activitystreams#Public","always":"https://www.w3.org/ns/activitystreams#Public"},"canQuote":{"automaticApproval":"https://www.w3.org/ns/activitystreams#Public","always":"https://www.w3.org/ns/activitystreams#Public"},"canReply":{"automaticApproval":"https://www.w3.org/ns/activitystreams#Public","always":"https://www.w3.org/ns/activitystreams#Public"}}}