Standard Modular System: Difference between revisions

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{{Short description|IBM computer circuit board, circa 1960}}

{{Refimprove|date=May 2010}}

[[File:SMScard.jpg|thumb|A single-width SMS card.]]

{{Other uses|IBM SMS (disambiguation){{!}}IBM SMS}}

[[File:IBM SMS Card (8372882397).jpg|thumb|An SMS card with an [[Solid Logic Technology|SLT]] device at far right (the square metal piece)]]

[[File:SMScard.jpg|thumb|A single-width SMS card.]]

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 SMS was superseded by [[Solid Logic Technology]] (SLT) introduced with [[System/360]] in 1964, however they remained in use with legacy systems through the 1970s.

[[File:IBM 1401 card cage.agr.jpg|thumb|SMS cards in an [[IBM 1401]] mid-size computer.]]

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 SMS was superseded by [[Solid Logic Technology]] (SLT) introduced with [[System/360]] in 1964, however they remained in use with legacy systems through the 1970s.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.agr.jpg|thumb|SMS cards in an [[IBM 1401]] mid-sizesized 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.<ref>[https://www.flickr.com/photos/jamo_spingal/8372882397/in/photolist-dKTdek-jWpsf5-eP5Xm3-5HWroj# Flickr''(see image of an SMS card with SLT module]</ref>right)''.

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&nbsp;inches wide by 4.5&nbsp;inches tall by 0.056&nbsp;inches thick, with a 16-pin [[gold plated]] [[edge connector]]. Double-width cards are 5.375&nbsp;inches wide by 4.5&nbsp;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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<gallery>

File:IBM SMS card component side.agr.jpg.jpg|SMS card from an IBM 1401

File:IBM SMS card circuit side.agr.jpg.jpg|Circuit side of same SMS card

File:IBM SMS card, with power transistors.agrfront.jpg|SMS card, from an IBM 1401front

File:IBM 1401SMS card, cage 2back.jpg|IBM 1401SMS card, cageback

File:IBMSMS 1401card with backplane.agrpower transistors.jpg|[[WireSMS wrap]]pedcard [[backplane]]from thean sameIBM 1401 card cage

File:IBM 1401 card cage 2.agr.jpg|IBM 1401 card cage

File:IBM 1401 backplane.jpg|[[Wire wrap]]ped [[backplane]] the same 1401 card cage

File:IBM 7070.jpg|IBM 7070 card cage

</gallery>

== See also ==

* [[IBM Solid Logic Technology]]

* [[Flip-Chip module]]

== References ==

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==External links==

*[http://www.piercefuller.com/scan/ibm-223-6900-2.pdf?id=ibm-223-6900-2 Customer Engineering Instruction-Reference, Standard Modular System] PDF

*[http://members.optushome.com.au/intaretro/SMSCards.htm IBM's Standard Modular System (SMS) cards] (dead link 10 March 2024)

*http://ibm-1401.info/index.html

** http://ibm-1401.info/IBM-StandardModularSystem-Neff7.pdf