14 May
2015
14 May
'15
6:26 p.m.
On 05/14/2015 10:28 AM, Lyle Bickley wrote:
On Wed, 13 May 2015 19:37:57 -0600
Eric Smith <spacewar at gmail.com> wrote:
I owned a PDP-12 for years. I bought it
directly from DEC shortly after
it went out of production for $3,000!
My PDP-12 had 12Kw of RAM, an RF08 (2x256K) disk, dual TU56 Linctapes,
TC08 and TU55, ASR-33 and ADM-3 terminals, 9-track reel to reel mag
tape. In addition, because I wanted really high speed paper tape, I
created an interface to a Tally 1000cps PT reader and high speed punch.
I was the last official DECUS Coordinator for the PDP-12, so my PDP-12
was used to copy the contents of the DECUS PDP-8 and PDP-12 libraries to
all of the different media using my PDP-12.
Ahh, that explains all the drives!
I was the local DECUS librarian in the St. Louis area,
mostly for VAX stuff. I got some CDC Keystone 9-track
1600/6250 tape drives at a surplus shop, and did the tape
copying in my home basement.
I wrote a program that could read a tape and put it in a
container file format on disk, and then spool off copies to
tape at full streaming speed.
Jon
From the
web page:
"so it actually has two processors"
Is that true? I haven't had time to make a detailed study of the
PDP-12 logic design, but my understanding was that unlike the LINC-8,
which basically was two separate processors mashed together, the
PDP-12 was a single integrated processor with two modes (PDP-8 and
LINC). I was told that there were some commonalities that were taken
advantage of, such that merging it resulted in reduction of the total
logic necessary as compared to the LINC-8.