This record contains one Standard Modular System (SMS) card type: Three-Way or Type A (out-of-phase load). This card was used with the IBM 7090 system. The circuit card is made of an epoxy paper laminate material.
International Business Machines (IBM)
Card Card and Program Cap Connection Code. Stamped on side edge of board, component side
Stamped on side edge of both boards, component side Possibly an 'engineering change' number
IBM part number. Stamped on side edge of board, component side