1964 IBM System 360 Mainframe Computer Chip - Solid Logic Technology SLT

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In 1964, IBM's Solid Logic Technology (SLT) made its first commercial application in IBM's System 360 computer.

Being somewhat uncertain of the reliability and availability of the then new monolithic integrated circuits of the time, IBM chose instead to design custom hybrid integrated circuits using discrete flip chip mounted glass encapsulated transistors and diodes with silk screened resistors on a ceramic substrate, then either encapsulated in plastic or covered with a metal lid. Several of these were then mounted on a small multi-layer printed circuit board to make a "Solid Logic Technology" (SLT) module. Each SLT module had a socket on one edge that plugged into pins on the computer's back plane.

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[1944GPW]

My late father was a specialist on the System/360 Model 40 during the mid to late 60s. As a kid I remember him bringing home dead Mod 40 circuit boards with lots of SLT modules on them. I had great fun lifting off the metal caps and looking at the tiny transistors there. The top of the SLT substrate had a layer of slippery clear grease on it which used to get on my fingers - I don't know what it was, but I guess silicone grease. Great memories!