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m DrVogel moved page IBM Standard Modular System to Standard Modular System without leaving a redirect: Requested by DigitalIceAge at WP:RM/TR: No disambiguator needed (trademark only ever used by IBM); secondary sources almost always refer to SMS without brand prefix ([https://www.google.com/search?nfpr=1&tbm=bks&q=%22Standard%20Modular%20System%22%20%22ibm%22 Google Books], [https://scholar.google.com/scholar?q=%22Standard%20Modular%20System%22%20%... |
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[[File:SMScard.jpg|thumb|A single-width SMS card
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The '''Standard Modular System (SMS)''' is a system of standard [[transistor]]ized circuit boards and mounting racks developed by [[IBM]] in the late 1950s, originally for the [[IBM 7030 Stretch]].<ref>{{cite web|url=http://www.computer-museum.ru/books/archiv/ibm36040.pdf#page=18 |title=The 360 Revolution |last=Boyer |first=Chuck |date=April 2004 |publisher=IBM |page=18 |accessdate=25 November 2013}}</ref> They were used throughout IBM's second-generation computers, peripherals, the [[IBM 700/7000 series|7000 series]], the [[IBM 1400 series|1400 series]], and the [[IBM 1620|1620]]. SMS was superseded by [[Solid Logic Technology]] (SLT) introduced with [[System/360]] in 1964, however they remained in use with legacy systems through the 1970s.
==Overview==
Many IBM peripheral devices that are part of System/360, but were adapted from second-generation designs, continued to use SMS circuitry instead of the newer SLT. These included the [[IBM 2400|240x-series tape drives]] and controllers, the [[IBM 2540|2540 card reader/punch]] and [[IBM 1403|1403N1 printer]], and the [[IBM 2821 Control Unit|2821 Integrated Control Unit]] for the 1403 and 2540. A few SMS cards used in System/360 peripheral devices even have SLT-type hybrid ICs mounted on them.<ref>[https://www.flickr.com/photos/jamo_spingal/8372882397/in/photolist-dKTdek-jWpsf5-eP5Xm3-5HWroj# Flickr image of an SMS card with SLT module]</ref>▼
[[File:IBM 1401 card cage.jpg|thumb|SMS cards in an [[IBM 1401]] mid-sized computer]]
▲Many IBM peripheral devices that are part of System/360, but were adapted from second-generation designs, continued to use SMS circuitry instead of the newer SLT. These included the [[IBM 2400|240x-series tape drives]] and controllers, the [[IBM 2540|2540 card reader/punch]] and [[IBM 1403|1403N1 printer]], and the [[IBM 2821 Control Unit|2821 Integrated Control Unit]] for the 1403 and 2540. A few SMS cards used in System/360 peripheral devices even have SLT-type hybrid ICs mounted on them
SMS cards are constructed of individual [[discrete component]]s mounted on single-sided paper-epoxy [[printed circuit board]]s. Single-width cards are 2.5 inches wide by 4.5 inches tall by 0.056 inches thick, with a 16-pin [[gold plated]] [[edge connector]]. Double-width cards are 5.375 inches wide by 4.5 inches tall, with two 16-pin gold plated edge connectors. Contacts are labeled ''A–R'' (skipping ''I'' and ''O'') on the first edge connector, and ''S–Z, 1–8'' on the second.
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