Plane of core memory

Jussi Kilpelainen's page cited above ( https://www.tindie.com/products/kilpelaj/core-memory-shield-for-arduino/) refers to the work of Ben North and Oliver Nash to create another core memory shield for Arduino Unos. Their site inspired Jussi to create his shield kit, which can be viewed at: http://www.corememoryshield.com <http://www.corememoryshield.com/report.html> Ben's and Oliver's home page contains a link to the files: http://www.corememoryshield.com/Core-Memory-Shield.zip It also contains a link to a page with the detailed explanations and schematics for core memory circuitry needed to read and write to core: http://www.corememoryshield.com/report.html Wayne Holder shows how to build the most minimal circuit using an SN754410 driver IC (http://focus.ti.com/docs/prod/folders/print/sn754410.html, about $2.50 each for one, and a bit over $2.00 each for 10) and an Arduino Nano (about $5.00 each for one, and around $3.50 each for 10) to address one bit of core memory and, more importantly, how to expand the circuit to address larger numbers of bits/cores using more SN754410s: https://sites.google.com/site/wayneholder/one-bit-ferrite-core-memory There's enough information on Wayne's page to build the circuitry to access any arbitrary number of cores, with the number of cores/bits being addressable increasing by a factor of four for each doubling of the number of driver ICs. ePrey has lots of old core memory planes available for as little as $30 each for about 500 bits, with intact wiring (from Russia or the Ukraine, which developed much of the Soviet Union's weapons systems and advanced commercial electronics). So, you can just wire the above circuits to their pins instead of going through the hate and discontent of testing a ziplock bag of 500 ~2,000 teensy-weensy cores (from Bulgaria) to find enough with the right properties, and then having to weave your own plane. All the Best and Enjoy! Jim