17 Nov
2005
17 Nov
'05
3:45 p.m.
Allison wrote:
Ok it's very obvious you know nothing of PDP-11s.
First, 64kb of memory.
PDP11s have memory mapped IO so the TOP 8kb of memory is IO space. Typically
a loaded PDP11 without MMU is 24-28kW of ram (words as its a 16bitter).
So what is 8k between friends. If the truth be known the only thing a
know about a 11
is that they are nice machines.
Now with all that been said about models, boards and
busses. You expressed
no wish other "I want one.". Well lets all drop a 11/70 mid sized system on
you. Figure about 500 pounds and 3 6ft racks plus a few washing machine
sized disks. Got a spare room with air conditioning. Don't forget you
need a 220V 30A drop for that.
I got stairs ... no comment :)
Oh, too big. Ok how about an microPDP11 on about
30" deep, 27" tall and
8" wide. Runs on 120V maybe 4-5a max. Oh weighs in around 60pounds with
a single hard disk of 30mb. Should easily cost more to ship than buy.
Shipping will cost a bomb due to both size and weight. The disk should
be removed and packed seperately. Not a lot of those around but a great find.
yep... I figure a good 1500 miles of shipping from the USA, but then I
don't need overnight express.
So thats cheap and common usually the BAll-S.
Recognizable by the three
toggle switches on the front. had plenty of bus and power for most Qbus
boards. No disk bays and generally meant for rack mounting. So usually
you want one of these in a rack of the 48" or taller. Then disks like
RX02 and RL02 are easily mounted. Not shippable except by freight. The
good news is of all PDP11s they are most common and often free. Try
your local university.
If I had one, I could of snagged one already from there.
Allison