25 Apr
2023
25 Apr
'23
1:05 p.m.
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(a)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(a)classiccmp.org> wrote:
On Mon, Apr 24, 2023 at 11:11:35AM +0100, Pete
Turnbull wrote:
--
End of line
JOB TERMINATED Okey Dokey On 23/04/2023 22:52, KenUnix via cctalk wrote:
figured
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 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.