This record contains one Standard Modular System (SMS) card type: Three-Way or Type B (in-phase load). This card was used with the IBM 7090 system. The circuit card is made of an epoxy paper laminate material.
Date
Circa 1959
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Other number
491179
Printed in solder on printed wiring side of card
Other number
DF YZ
Card and Program Cap Connection Code. Stamped on side edge of board, component side
Other number
EC 109897
Stamped on side edge of both boards, component side Possibly an 'engineering change' number
Part number
371341
IBM part number. Stamped on side edge of board, component side
