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==Transistors and circuitry== The 7090 used more than 50,000 [[alloy-junction transistor|germanium alloy-junction transistors]] and (faster) germanium diffused junction<ref name=diffused/> [[drift-field transistor|drift transistors]].<ref name=IBM-7090>[https://web.archive.org/web/20050121014723/http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP7090.html 7090 Data Processing System]</ref> The 7090 used the [[IBM Standard Modular System|Standard Modular System]] (SMS) cards using [[current-mode logic]]<ref>[http://files.righto.com/sms/AA.html SMS AA: Two-Way AND (current mode)]</ref> some using diffused junction drift transistors.<ref name=diffused>[http://files.righto.com/sms/DBZV.html SMS DBZV: Two-Way AND, Type B]</ref>
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