if you hadn't already known this about the PDP-8

From: Dave McGuire <mcguire_at_neurotica.com>
Date: Thu Dec 13 12:05:34 2001

On December 13, Chris Kennedy wrote:
> were to do that or not have a machine at all. The big problem
> is doing useful things in the absence of a memory mapping and
> protection unit of some sort (the Nova grew one early on, but
> I'm too ignorant of the PDP-8 family to know if such an option ever
> existed).

  On an 8/e, I believe that'd be the Memory Extension and Timeshare
Control board. Among other things it drives the three high-order
address bits to go beyond 4KW of core, but if memory serves this is
more of a bank-switching scheme than anything else.

  But hey, it works! :-) PDP8s are Good Food(tm).


Dave McGuire
St. Petersburg, FL
Received on Thu Dec 13 2001 - 12:05:34 GMT

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