Delete comment from: Ken Shirriff's blog
I seem to remember some similar stuff in the high loop of the IFR service monitor, the 1200, 500 and 1500 had the same one I think. This was a unit that generated RF in coarse steps between 2 and 3 GHz, iirc, and was implemented as two boards in a module packed with ECL ICs. I'd never seen ECL before and if i have since don't remember it.
That would have been a box you would have loved, the IFR service monitor.
Mar 20, 2017, 12:45:57 AM
Posted to Inside the vintage 74181 ALU chip: how it works and why it's so strange