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The PDP-1x is a Digital Equipment Corporation PDP-1 computer modified to support both ones and twos complement arithmetic, and to include a memory management unit. It ran a locally developed operating system with specific facilities to represent virtualized devices and inter-process communications. The top-level element was called a "Sphere". It contained resources (called capabilities) and execution elements. I believe the execution elements were called "processes".

There was a manual for the OS named "INSTR5 ALL". I would like to read more about the OS to see if I was just a youngster amazed by something I was unfamiliar with, or if this operating system was unique and worthy of re-examination today.

Where could I find documentation of the PDP-1x Operating System?

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    Is this doc related in any way? Probably not, but I thought it wouldn't hurt to post it just in case. – another-dave Mar 20 at 22:10
  • This looks to predate the changes which turned the pdp1 into the pdp1x. Good for history, and I will read it. Thank you! – cmm Mar 20 at 23:12
  • I'm still hoping to find the documentation for the PDP-1x OS. – cmm Jul 17 at 1:05

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