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21574Re: [midatlanticretro] Found some Core Memory

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  • Jim Scheef
    Jun 2, 2011
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      I would expect anything from IBM to say I B M on it somewhere. In those
      days, IBM made everything themselves, so another company name would
      indicate this is from somewhere else.

      Jim

      On 6/2/2011 1:42 PM, Dave McGuire wrote:
      > On 6/2/11 12:59 PM, Dan Roganti wrote:
      > > when I took a closer look, it does appear to be a raw core plane - is
      > > that PG-rated ;)
      > > As there's no support logic on there that you typically see in a memory
      > > controller circuit. Other than what appears to be some kind of buffer or
      > > level translator chips sparsely located on the edges of the core and
      > > routed to the backplane card edge connectors.
      >
      > They are probably (chips full of) selection diodes for the X/Y array.
      >
      > See DEC-8E-HR1C-D_8eMaint_Feb73.pdf pp.3-75 to 3/78 for a description
      > of how that works, and a few pages before that for schematics. (only
      > using PDP-8 as an example because it's well-documented)
      >
      > -Dave
      >
      > --
      > Dave McGuire
      > Port Charlotte, FL
      >
      >
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