{"id":407,"date":"2018-10-04T13:02:01","date_gmt":"2018-10-04T20:02:01","guid":{"rendered":"https:\/\/www.karlstechnology.com\/blog\/?p=407"},"modified":"2019-05-27T13:07:15","modified_gmt":"2019-05-27T20:07:15","slug":"vlb-for-x86","status":"publish","type":"post","link":"https:\/\/www.karlstechnology.com\/blog\/vlb-for-x86\/","title":{"rendered":"VLB for x86"},"content":{"rendered":"\n<p><strong>VESA Local Bus (VLB)<\/strong><\/p>\n\n\n\n<p>The first\u00a0local bus\u00a0to gain popularity, the\u00a0<em><a href=\"https:\/\/www.karlstechnology.com\/blog\/vesa-local-bus\/\">VESA local bus<\/a><\/em>\u00a0(also called\u00a0<em>VL-Bus<\/em>\u00a0or\u00a0<em>VLB<\/em>\u00a0for short) was introduced in 1992. <a href=\"https:\/\/en.wikipedia.org\/wiki\/VESA_Local_Bus\">VESA <\/a>stands for the\u00a0<em>Video Electronics Standards Association<\/em>, a standards group that was formed in the late eighties to address video-related issues in personal computers. Indeed, the major reason for the development of VLB was to improve video performance in PCs.<\/p>\n\n\n\n<p>The VLB is a 32-bit bus which is in a way a direct extension of the 486 processor\/memory bus. A VLB slot is a 16-bit ISA slot with third and fourth slot connectors added on the end. The VLB normally runs at 33 MHz, although higher speeds are possible on some systems. Since it is an extension of the ISA bus, an ISA card can be used in a VLB slot, although it makes sense to use the regular ISA slots first and leave the (small number of) VLB slots open for VLB cards, which won&#8217;t work in an ISA slot of course. Use of a VLB video card and I\/O controller greatly increases system performance over an ISA-only system.<\/p>\n\n\n\n<p>While VLB was extremely popular during the reign of the 486, with the introduction of the Pentium and its PCI local bus in 1994, wholesale abandonment of the VLB began in earnest. While Intel pushing PCI was one reason why this happened, there were also several key problems with the VLB implementation. First, the design was strongly based on the 486 processor, and adapting it to the Pentium caused a host of compatibility and other problems. Second, the bus itself was tricky electrically; for example, the number of cards that could be used on the bus was low (often only two or even one), and occasionally there could be timing problems on the bus when more than one card was used. Finally, the bus did not support\u00a0bus mastering\u00a0properly since there was no good arbitration scheme, and did not support\u00a0Plug and Play.<\/p>\n\n\n\n<p>Today VLB is obsolete for new systems; even the latest 486 motherboards use PCI, and all Pentiums and higher use PCI. However, these systems do still offer reasonable performance, and are now plentiful and very inexpensive&#8211;if you can still find them.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<table class=\"wp-block-table\"><tbody><tr><td><strong>The PC Guide<\/strong><br>Site Version: 2.2.0 &#8211; Version Date: April 17, 2001<br>\u00a9 Copyright 1997-2004\u00a0Charles M. Kozierok.\u00a0All Rights Reserved.<\/td><\/tr><tr><\/tr><\/tbody><\/table>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>This is an archive of Charles M. Kozierok&#8217;s PCGuide (pcguide.com) which disappeared from the internet in 2018.  We wanted to preserve Charles M. Kozierok&#8217;s knowledge about computers and are permanently hosting a  selection of important pages from PCGuide.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VESA Local Bus (VLB) The first\u00a0local bus\u00a0to gain popularity, the\u00a0VESA local bus\u00a0(also called\u00a0VL-Bus\u00a0or\u00a0VLB\u00a0for short) was introduced in 1992. VESA stands for the\u00a0Video Electronics Standards Association, a standards group that was formed in the late eighties to address video-related issues in personal computers. Indeed, the major reason for the development of VLB was to improve video [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,48],"class_list":["post-407","post","type-post","status-publish","format-standard","hentry","category-computerrepair","tag-computer-repair","tag-pcguide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>VLB for x86 - Computer Repair Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.karlstechnology.com\/blog\/vlb-for-x86\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VLB for x86 - Computer Repair Blog\" \/>\n<meta property=\"og:description\" content=\"VESA Local Bus (VLB) The first\u00a0local bus\u00a0to gain popularity, the\u00a0VESA local bus\u00a0(also called\u00a0VL-Bus\u00a0or\u00a0VLB\u00a0for short) was introduced in 1992. 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