Re: Time to revive Emerald?

From: Roger Ivie (rivie_at_ridgenet.net)
Date: 12/20/04

  • Next message: Rob Young: "Re: Older StorageWorks Parts Not Available" 
    Date: Mon, 20 Dec 2004 04:50:48 GMT

    On 2004-12-20, Neil Rieck <n.rieck@sympatico.ca> wrote:
    >> VAX extends the -11 virtual address from 16 bits to 32 bits. Thus, it's
    >> a Virtual Address Extension by way of making the virtual addresses
    >> bigger, *not* by way of adding virtual addresses where there weren't any
    >> before.
    >>
    > Not to belabour the point, but "virtual memory" really means memory which
    > would exist in RAM if you had a sufficient amount, but is currently out on
    > the disk because you didn't.

    Let me tell you, a PDP-8/e (max 32Kw) running twelve users under ETOS
    (each with an OS/8 session requiring at least 8Kw apiece) made plenty of use
    of "virtual memory" by your definition. That RK05 could get thrashing
    something fierce. Twelve users was the limit, though; the one time I
    managed to get a 13th user logged in the system gave up and never left
    the idle loop.

    And I presume you're not willing to accept the swapping done by Unix on
    a PDP-11 as "virtual memory"? (in 6th edition Unix, a fork consisted
    essentially of swapping the process out to disk and then "forgetting"
    to delete the in-core copy) 

    -- 
Roger Ivie
rivie@ridgenet.net
http://anachronda.webhop.org/
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  • Next message: Rob Young: "Re: Older StorageWorks Parts Not Available"

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