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The card type was a two to four letter code imbossed on the card (e.g., ''MX, ALQ''). If the card had a "program cap" the code was split into a two letter card type code and a two letter "cap connection" code (e.g., ''AK ZZ'').
When SMS was originally developed, IBM anticipated a set of a couple hundred standard card types would be all that would be needed, making design, manufacture and servicing simpler. Unfortunately that proved far too optimistic as the number of different SMS card types soon grew to well over 2500. Part of the reason for the growth was that multiple [[Digital data|digital]] [[logic families]] were implemented (ECL, RTL, DTL, etc.) as well as [[analog circuit]]s, to meet the requirements of the many different systems the cards were used in.
== References ==
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