Artifact Details


Magnetic Drum for SS 80 or SS 90 mainframe

Catalog Number



Physical object


Remington Rand Univac

Place Manufactured


Identifying Numbers

Model number 79
Serial number 260F 7126


The Univac 7900 was designed by Engineering Research Associates, a team including many of the same people who had done the IBM 650 design for IBM. Its first "incarnation" was as the "Cambridge Air Force Computer". >That was "productized" as the UET (Universal Electronic Tabulator"), >filling much the same niche for Rem Rand customers that the 1401 would >later fill for IBM customers. The interesting thing about these machines >is hinted at by the name "Solid State 90" (or 80, depending on whether >the machine used RemRand 90-column, or Hollerith 80-column cards). >Although all the logic functions were performed by either transistors >or diode-core logic, the machines included several vacuum- tubes, >particularly in the drum memory and clock circuitry. Nonetheless, their >"mostly solid state" design was a major step, and some folks consider >them the first "commercial" solid-state computers, waffling a bit >about the few tubes. Other claimants to the title included the CDC-1604 >(later, but more completely transistorized) or the Philco Transac-2000, >which _may_ have shipped before the 1604, but may also not have actually >worked at a customer's site first :-)


Calculator: electromechanical


Gift of Mike Albaugh

Lot Number