I brought my growing collection of gear for the electronics side of my Core Rope Memory project back to TOG on Sunday. @tangentmonger arrived just as I was beginning to despair, and between us we got a working bit of memory! Thanks Becky!
The photo above is the pulse generator circuit (with a 555 timer chip at the centre). We made it with a lot of trial and error, and reference to this page.
This photo shows the output of the pulse generator passing through the wire-wrapped toroid core. We were able to detect the induced current in the coil when the pulse generator was active.
I'll be heading back in to TOG, so hopefully there'll be more progress to report soon.