If you're interested in the machines IBM used to weave cores, see: http://ibm-1401.info/IBMCoreArraysIEEEMagnetics1969.pdf http://ibm-1401.info/IBMCoreArraysIEE

If you're interested in the machines IBM used to weave cores, see: http://ibm-1401.info/IBMCoreArraysIEEEMagnetics1969.pdf http://ibm-1401.info/IBMCoreArraysIEEEMagnetics1969.pdf One interesting thing they did was to thread extra cores onto each wire so they could crush the bad cores and still have enough to continue. (They would test after wiring one direction, before wiring the second direction.)