On Sun, 20 Feb 2022 at 21:20, Bill Gunshannon via cctalk <cctalk@classiccmp.org> wrote: > > On 2/20/22 15:31, Chuck Guzis via cctalk wrote: > > On 2/20/22 10:10, Mark Kahrs via cctalk wrote: > >> I heard Butler Lampson once exclaim that ECL design was in some ways easier > >> than TTL. If you terminated every line, you get controlled impedances with > >> controlled edges. This was the design philosophy for the Dorado. > > > > Indeed--ECL WW prototype boards usually had a 3rd row for SIP > > termination resistors alongside the DIP sockets. One nice thing about > > ECL is that there are many fewer problems with power rail spikes. On > > the other hand, the constant power consumption needs beefier power supplies. > > > > I recall that Honeywell redid one of their mainframe designs in ECL, > > with somewhat disappointing performance results. I don't recall the > > details offhand. > > It's long enough ago that my mind is fuzzy, but I think Primes were > ECL. >
Gould made a set of realtime and (via a board swap) unix systems - we had a few PowerNode 6040s and one 9080 at university. One of the 6040's was mostly consumed by providing NFS to the other machines. I remember at the time being impressed that the ffs had on disk padding for 64 bit timestamps. When the university stopped using them the CS department just left their 6040 running unmonitored over the summer, and came in to find the aircon had partially flooded the room then failed, and the machine was happily still running in a shallow pool of slightly steamy water (it was, shall we say, not in a purpose built room) I also heard a possibly apocryphal story that the royal navy was tendering for an onboard computer for a sub: various suppliers found that their sample machines kept crashing, and the gould was the only one able to run reliably - turned out the installation location was quite close to "power generation equipment" and had been selected as the ambient temperature was too high to put anything else there David
