Ampex ARM10

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The Ampex ARM10 was main memory for the PDP-10, which connected to the external memory bus. There were several different forms (certainly at least three), sharing only the name:

  • the ARM10, a 256K word core memory unit (reported on the KA10 MIT-AI ITS machine);
  • the large ARM-10L was also a core system (one was attached to the KL10 MIT-MC ITS machine)
  • the ARM-10LS, known from DEC documentation, which seems to have been, effectively, an ARM-10L which used DRAMs instead of core

Finally, there are reports of one which provided "four mega-words of ECC-protected semiconductor memory (using 64K DRAMs)"; that was likely the Ampex ARM20.

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