3 ms·
Back when I was a CPU logic designer, I worked on two machines that used ECL logic, where the basic building-block gate was a 4-input OR/NOR (the gate produced
by dbcurtis 7y ago
Back when I was a CPU logic designer, I worked on two machines that used ECL logic, where the basic building-block gate was a 4-input OR/NOR (the gate produced both phases at output). I recall that on one of these machines, each logic card was supplied with well over 100A on the -4.5 supply, we had a space budget of 98 cards. But the tough limit to hit was cooling. For the entire CPU we had only a single 20 BTU-ton water chiller, and had to sneak everything in under the cooling limit.
- tpmx 7y ago> For the entire CPU we had only a single 20 BTU-ton water chiller We'll probably get there soon again, this time for gaming PCs. Was this at one of the mainframe manufacturers? (https://en.wikipedia.org/wiki/BUNCH https://en.wikipedia.org/wiki/BUNCH)
- ncmncm 7y agoControl Data?
- geomark 7y agoI was one generation behind you. We had actual flip/flops and even small ROMs, made from something called CTL (complementary transistor logic) which was similar to ECL in its voltage and power requirements. But did not require water cooling, just banks of large squirrel cage fans.