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Ken Shirriff said...

J: IBM used CMOS chips in the low-end ES/9000 system, as you suggest. But the bipolar chips were faster, so IBM used them in the high-end systems despite the need for exotic cooling. By 1997, the performance of CMOS had improved to the point that IBM abandoned the bipolar chips.

Mar 31, 2021, 6:40:08 PM

Posted to Teardown of a logic chip from a vintage IBM ES/9000 mainframe