In <[EMAIL PROTECTED]>, on 03/01/2008
   at 05:11 PM, Paul Gilmartin <[EMAIL PROTECTED]> said:

>I'm reminded of the PDP-6/10/20,

There was no PDP-20. As I recall the DECSYSTEM-20 used a KL10.

>where the registers were memory mapped, or the bottom 16 words of 
>memory were register mapped, depending on model/feature/price.

Yes. Some earlier machines did similar things.

-- 
     Shmuel (Seymour J.) Metz, SysProg and JOAT
     ISO position; see <http://patriot.net/~shmuel/resume/brief.html> 
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)

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