Which PDP?

Ashley Carder wacarder at usit.net
Tue Mar 22 18:24:55 CST 2005


> 11/03 ? forget it . no mmu - won't run real (v6,7) unix..
> a 34 might be a better bet. Wasn't the 35  small-packaged 40/45?
> heinz

The 11/35 is the same CPU as the 11/40, and it did come in
a 10 1/2" chassis as an option, but the CPU card set is 
*quite difficult* to find spares for.  The standard 10 1/2" 
chassis isn't set up to hold a lot.  I have one that is sickly 
and it has a CPU backplane, an early 9-slot core memory backplane, 
and a 4-slot core memory backplane.  Even if you tried to replace 
the core memory backplanes with a standard unibus backplane such 
as the DD11-DK so you could use more modern MOS memory and add
an RL02 controller or something like that, you could not plug
the backplane into the power supply without reworking the
power supply connectors. 

The old blinking lights PDP-11s are not easy to come by, and
if you do find one you will likely have to pay lots of $$$$
for it.

I think an 11/34 is a better choice if you want a 70s model 
PDP-11 to start out with.  I actually have a spare 11/34A
that I might be interested in selling once I fix what I
believe is a power supply problem.  Spares for the 11/34 
are also fairly obtainable.

Ashley





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