Ken, This discussion does my geezer's heart good.
I used to maintain Honeywell mainframes in the late 1970s, some of which had core memories. Tapping them on the floor wasn't an option since they were such huge beasties but they did have space for spare bits. I've swapped to the spare bits or replaced sense amps to fix many a core problem. Something I'll never forget is the way the power supplies "sang" when running memory diagnostics on the core units. I could always tell the diagnostic was done when the singing stopped. - Rod > On Apr 24, 2023, at 2:11 PM, KenUnix via cctalk <cctalk@classiccmp.org> wrote: > > David, > > I could tell you I had an experience where I had a stuck bit in core memory. > > It was in a trunk frame in a #2ESS AIS. > > I removed the core package and tapped it on the floor, reinserted it and > the trouble cleared. > > Sticky bit! Ha > > I only knew that because it happened to me on my old PDP-8/I.. > > Ken > > > On Mon, Apr 24, 2023 at 1:50 PM David Gesswein via cctalk < > cctalk@classiccmp.org> wrote: > >> On Mon, Apr 24, 2023 at 11:11:35AM +0100, Pete Turnbull wrote: >>> On 23/04/2023 22:52, KenUnix via cctalk wrote: >>>> Pete, >>>> >>>> Did the 8E have core or solid state memory? >>> >>> It had both, but I didn't put the core boards in the dishwasher. I >> figured >>> they might be too delicate for that, so I rinsed them by hand in the >> kitchen >>> sink. >>> >>> I should have said that in my original post. >>> >> >> I assume your referring to the core electronics boards and didn't wash the >> core plane. >> >> I've never used the dishwasher. I've hand washed R, W, G and M type boards >> in >> sink with dish soap and soft bristle brush, rinsed, then blew off with >> air compressor, then finish dry with fan. For pots and other >> components that I wasn't sure how well they were sealed I used damp brush >> or >> cloth around them. Rest got dunked. No obvious issues from washing. >> > > > -- > End of line > JOB TERMINATED Okey Dokey
