[Info-vax] OT: obscure PDP11 OSes (even more dinosaury)

[David Froble]

Stephen Hoffman wrote:
> On 2015-06-20 20:29:30 +0000, Hans Vlems said:
> 
>> My question was whether the 11/20 had support for 18 bit addresses. I 
>> thought that the 11/20 was the only model limited to a 2^16 address 
>> space.
> 
> The <http://gunkies.org/wiki/PDP-11> and 
> <http://hampage.hu/pdp-11/main.html> pages indicate not; that there were 
> other boxes that used 16 bits of the 18 bit UNIBUS.
> 
>  From the Things DECfolks Can't Unsee department: the new Dunkin Donuts 
> coffee shop color scheme looks like that of a PDP-11.
> 
> 

The first PDP-11 I used was an 11/40.  I don't think it had more than 16 
bits of address space.  Could be wrong.  I seem to recall that the 11/40 
could run RSTS, but the 11/20 could not.  Top of the line at that time 
was the PDP-11/45.