28 Dec
2017
28 Dec
'17
3:51 a.m.
You are mixing a couple of different stories I fear...
If you want the full story get a copy of: Computer Engineering: A DEC
View of Hardware Systems Design
<https://www.amazon.com/Computer-Engineering-Hardware-Systems-Design/dp/1483207676>
But a snap shot for this mailing list is this ... The PDP term was used by
KO when he was funding Digital because the VC's the 60s did not believe
that a computer company would succeed. But making things for the
instrumentation market (Lincoln Labs, Livermore, *etc*.). This is how
PDP-1 came to be. The PDP term was keep for the first 25 years (until the
Vax and renaming of the PDP-10/PDP-20 to DECSystem 10/20). [The 1 begat the
6, 9, 15 an 10 families].
The concept of purchasing smaller system, was indeed true. This was the
idea behind the >>mini-computer<< or *minimal computer* that Gordon Bell
who lad left DEC temporarily to be a CMU Prof for a time began to explore.
He took the idea and commercialized and the PDP-8 line was the first in
that line. The 11 & 15 were full computer systems. DEC also made
something called the PDP-16 'Register Transfer Modules' (RTMs) which was an
attempt to make the small controller idea even more accessible, but the
Intel microprocessor would eclipse them (I think I was the last group at
CMU was talk a course using them. Another factoid, the predecessor to
VHDL/Verilog and the like, ISPL and ISPS actually spit out 'code' for DEC
RTM modules instead of gates).
But the key point is that in 1975 dollars, a PDP-11/40 system that was good
enough to run something like Sixth Edition of UNIX cost somewhere between
$50k-$150k. This would have been much, much cheaper than say a PDP-10, or
a equivilent IBM 'mainframe' size system which would have started above $1M.
Clem
On Wed, Dec 27, 2017 at 4:02 PM, Alec Muffett <alec.muffett(a)gmail.com>
wrote:
I apologise if this is too far from the main topic,
but I wanted to check
an urban legend.
There is a story - as I have heard it told - that PDPs established their
place (and popularity) in the marketplace by pointedly *not* advertising
themselves as "computers", but instead as "programmed data
processors".
This was because - so the story goes - that everyone in corporations of
the time simply *knew* that "computers" came only from IBM, lived in big
datacentres, had million-dollar price-tags, and required extensive project
management to purchase; whereas nobody cared enough about a thing called a
"programmed data processor" to bother bikeshedding the
few-tens-or-hundreds-of-thousands-of-dollars purchase proposal to an
inevitable death. Thus, they flitted under the purchasing radar, and sold
like hotcakes.
I wonder: does this story have substance, please?
Aside from anything else: I draw parallels to the adoption of Linux by
Wall St, and the subsequent adoption of virtualisation / AWS by business -
now reflected in companies explaining to ISO27001 auditors that "well, we
don't actually possess any physical servers..."
- alec
--
http://dropsafe.crypticide.com/aboutalecm