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rorypoole

Building a lot Core memory for a PDP8 Straight 8

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core memory

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  1. rorypoole's Avatar
    I have wanted a PDP8 straight 8 for over 10 years, recently I found a seller on ebay selling 0.5mm~ and 1.1mm~ raw cores for use in core memory, dated 1980~ this kicked off the PDP8 building project, I want to use the PDP8 as a CNC machine controller, so need 32kw of core memory. so I bought 9 boxed of 0.5mm dia. raw cores, I decided on the smaller cores as they would work faster and I have no data sheet on them.
    each core memory needs to store 4096 bits and as its a 12bit computer I will need 12 planes per 4kw, and one more as I want the parity option, so that is 53,248 cores for the first 4kw! and 425,984 cores for the full 32kw, that is 104 core memory planes that need weaving, each plane will be a 64X64 matrix, with inhibit and sense wires, so 4 wires per core, I have worked out I need 0.08mm wire to fit!
    Updated March 17th, 2013 at 12:09 AM by rorypoole
  2. rorypoole's Avatar
    The 9 boxes of raw core have arrived, and I have ordered the 0.08mm magnet wire!!
    Updated March 17th, 2013 at 12:06 AM by rorypoole
  3. rorypoole's Avatar
    The reel of 0.08mm magnet wire has arrived, it is thinner than I was expecting! but I now have a lot of it. I will now design a core memory testing rig for 1 bit core memory .
  4. rorypoole's Avatar
    I managed to loop some 0.7~ copper magnet wire threw the 1.2mm dia. core, 4 times and the 0.08mm magnet wire threw the 0.5mm dia. core 5 times! I am pleased that it was not as hard as I was dreading.
  5. rorypoole's Avatar
    I have made a 4 bit core memory plane with the 1.2mm cores