13 Dec
2001
13 Dec
'01
12:05 p.m.
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
--
Dave McGuire
St. Petersburg, FL