This record contains three (3) Standard Modular System (SMS) cards type: Diffused Junction P to N Buffer Converter. This card was used with the IBM 7090 system. The circuit card is made of an epoxy paper laminate material. "BAD" is written in pencil on one of the card's component side.
Date
Circa 1959
Manufacturer
International Business Machines (IBM)
Identifying Numbers
Other number
DF YU
Card and Program Cap Connection Code. Printed in solder on printed wiring side of card
Other number
EC 105815
Stamped on side edge of one board, component side. Possibly an 'engineering change' number
Other number
EC 108540
Stamped on side edge of one board, component side. Possibly an 'engineering change' number
Other number
EC 113096
Stamped on side edge of one board, component side. Possibly an 'engineering change' number
Part number
371345
IBM part number. Stamped on side edge of board, component side
