Canon EOS 5D Mark II
ƒ/8
21 mm
1/50
1600
That’s hot.
The 470 V/6 was Amdahl’s first product after breaking away from IBM. It was faster and cheaper than the IBM System/370, and the big iron competition had begun.
This 1975 bipolar ECL design used a novel radiator package that allowed the chips to be air cooled, a big advance over the liquid plumbing used by others.
Six years later, IBM took the heat sink concept to the extreme in a helium infused multi-chip module.
When I did my first chip designs at HP in 1987-89 they were also bipolar ECL. 1GHz fT if I recall. I designed a QPSK modulator and some unusual amps. I wish I still had the circuit diagrams, as I spent a bit of artistic effort on a Devo plant pot hat rendered in iridescent SiO2 thin films.
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