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This very rare treasure is two, 2, original IBM Pluggable Computer Logic Electronics Units for 604 Computer and also includes the Original Advertisement. We have seen each of these IBM Pluggable Units sell for over $ 200.00 and the original Advertisement sell for nearly $ 100.00. One IBM Pluggable Unit is marked 5965 on tube (this was called a CF-1 calculations). The other Pluggable Unit is extremely rare and seldom found with NO tube, but with Diodes marked D1 (this was used for If logic). This was a revolutionary invention by IBM in 1948 as the Vacuum Tube had all supporting logic electronics in one unit. Computer failure could be easily diagnosed and a new Pluggable Unit quickly installed. Included is the original IBM Advertisement for this revolutionary Pluggable Unit called “Piercing The Unknown”. This is the rarest of rare advertisements showing the actual Pluggable Unit with Vacuum Tube and below electronics that was made the IBM 604 Calculating Punch the most sophisticated machine of the time. Pluggable Units are each 6” in length. Advertisement is 10” x 6.5” and sent flat for framing. A portion of Advertisement reads “This IBM electronic tube assembly cuts through the unknown like a rocket through the stratosphere….”. This rare treasure from 40+ years ago will highlight any collection of IBM memorabilia. It belongs in a museum or with serious collector.
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