Earl Evans wrote:
On 7/23/2014
12:54 PM, Tony Duell wrote:
The advantage of DEC is that they are well-known,
there are lot of
manuals, etc. So you will not have problems finding inforamtion on them
Tony is right - there is lots of information out there for DEC
machines, and a helpful enthusiast community. Another advantage - if
you're looking to buy something, it's possible to get a working PDP-11
system without mortgaging your home :-) Sometimes you can find them at
low or no cost, although that seems to be more rare these days.
I also second the idea of having an idea what you want to do with the
machine. That way, you can decide what kind of system to look for. A
"minicomputer", depending on your definition, could fit on a desktop,
or might be the size of a refrigerator. This has space, power and
weight implications.
Overall, there are basically two types of PDP-11 systems:
(a) Unibus
(b) Qbus
Although there is no exact distinction, the Unibus group will,
on average, but much bigger and almost always, VERY much
heavier than the Qbus group. In general, a single individual
can manage to carry all of the components (one at a time in
some cases) of a Qbus system - although if disk drives such
as the RL01 / RL02 are used, that would be difficult, most
especially the cabinets. But systems which use a BA23 are
usually not too difficult - a BA123 is often too heavy for one
person.
One other consideration to acquire PDP-11 hardware should
be looked at. There are a number of free emulators for the
PDP-11 which provide the possibility of figuring out before
you acquire your own actual hardware exactly what you want
to do with the machine. SimH is considered entirely free.
Ersatz-11 is free for hobby users. There is also a great deal
of software available, although some operating systems are
easier to find than others.
Jerome Fine