RE: PDP 11/15
> -Original Message- > From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Paul Koning via cctech > Sent: Wednesday, June 19, 2019 1:59 PM > To: Bob Smith; General Discussion: On-Topic and Off-Topic Posts > Cc: Al Kossow > Subject: Re: PDP 11/15 > >... > 11/15 as a designation for an LSI based machine doesn't ring any bells at all. > > paul PDT-11/150? It is based on an LSI-11 and if you squint at the designation a bit ... -
Re: PDP 11/15
On Wed, Jun 19, 2019 at 3:11 PM Mark Linimon via cctalk < cctalk@classiccmp.org> wrote: > On Wed, Jun 19, 2019 at 03:01:50PM -0400, Jacob Ritorto via cctalk wrote: > > You know, one of the reasons I'm still on here is for the anecdotes > > Agreed! > > mcl > I am a big fan of bargain 11/15 too, that and the anecdotes of course. b
Re: PDP 11/15
On Wed, Jun 19, 2019 at 03:01:50PM -0400, Jacob Ritorto via cctalk wrote: > You know, one of the reasons I'm still on here is for the anecdotes Agreed! mcl
Re: PDP 11/15
On Tue, Jun 18, 2019 at 11:15 PM Randy Dawson via cctalk < cctalk@classiccmp.org> wrote: > Paul, > That is so cool! > How much space would it take? > That is my first computer (outside of timesharing and Z-80 homebrew). > My first job was on the PDP-15 to transcribe the APOLLO analog range tapes > of the lunar experiments, primarily the seismometer moonquake data for the > University of Texas Geophysics Lab (they designed the seismometers). > > The machine was a pretty good wall, 4-5 racks. On the other side of the > room were the FM/Direct Bell and Howell analog range tape players and > demodulators. > I ran this stuff all night long, hanging tapes, using the scope to adjust > analog heads for the best signal and transcribe to the digital tape. > NASA was not interested in this stuff anymore, they were onto Skylab. The > ALSEP lunar stations were TEG powered and would go on for decades > transmitting, probably still are. All we got was freetime gratis from the > range stations to point at the moon and hang a tape, the data was always > bad and a challenge to tweak heads the best we could. > > We had a Versatec electrostatic plotter to output the continuous seismic > record as I was decoding the tapes. > Anytime there was an 'event' on the plotter, I had Dr. Yosio Nakamura's > home number to call him in and take a look. > > Many nights, we re tweaked heads, to get the last bits of clean > seismometer data. > > Randy > Trivia: As I hung a tape out of sequence once, Fortran coders fixed that > next day. Next time it happened, the TTY chatters, RANDY! DIDN'T YOU > ALREADY ENTER GMT JULIAN DATE XXX:XXX:XXX > It was a all night job alone in the computer room, and I am listening to > Foghat between tape hangs and alignment. > > > You know, one of the reasons I'm still on here is for the anecdotes and this is far and away the coolest anecdote I've read in quite some time! Thanks for sharing, Randy; more, please!
Re: PDP 11/15
> From: Bob Smith > there have been refs to another more modern unit, based on LSI[-]11 > or later chip set I've never heard of that, and I wonder if DEC would really have released a new product with the same name as an old one (the two PDP-11/10's are different, as I'm not sure many of the first ones were sold, but a ton of -11/15's were). > I wonder if it is one of those or the orig. This one is one of the -11/20 type ones. > From: Paul Koning > I only ever heard of an 11/15 as the 11/20 relabeled for OEM > markets According to the "pdp11/15/20/r20 processor handbook", 1972 edition (i.e. the second edition of the -11/20 proc handbook), the /15 has (table on pg. 2) a "KC11" processor, which seems to be a KA11 with only a single interrupt request line. (Maybe it has a replacement card for the M824, with only a single interrupt line wired up?) There's a 'KF11-A' option which upgrades it to multi-line (pg. 4), for which there claims to be a manual (DEC-11-HKFA-D), but there are none online, but from other traces online it does seem that some people had to get and install it. So maybe the stuff in the proc manual isn't just marketing wibble. That same manual claims that power-fail restart was standard in the KA11; it was an option for the KC11, the KP11-A. Noel
Re: PDP 11/15
> On Jun 19, 2019, at 1:49 PM, Bob Smith via cctalk > wrote: > > IIRC, there are two models called //15. > The original, 10.5 high, an 11/20 with no power fail. We dold that to > Aeroflot with about 10 racks of periphs. > although I have never seen one, there have been refs to another more > modern unit, based on LSI=11 or later chip set, > so I wonder if it is one of those or the orig. > tks > bb That's odd, I only ever heard of an 11/15 as the 11/20 relabeled for OEM markets, the same way 11/05 and 11/10 are the same machine but different markets. Power fail was an option on the 11/20 too, as I recall. I suppose the different marketing might produce different sets of options, or different choices for what was "the standard package". 11/15 as a designation for an LSI based machine doesn't ring any bells at all. paul
Re: PDP 11/15
IIRC, there are two models called //15. The original, 10.5 high, an 11/20 with no power fail. We dold that to Aeroflot with about 10 racks of periphs. although I have never seen one, there have been refs to another more modern unit, based on LSI=11 or later chip set, so I wonder if it is one of those or the orig. tks bb On Tue, Jun 18, 2019 at 11:40 PM Al Kossow via cctalk wrote: > > > > On 6/18/19 8:15 PM, Randy Dawson via cctalk wrote: > > Paul, > > That is so cool! > > How much space would it take? > > 10.5" of rack space > > it is a PDP-11 model 15 (first generation) > >
Re: PDP 11/15
On 6/18/19 8:15 PM, Randy Dawson via cctalk wrote: > Paul, > That is so cool! > How much space would it take? 10.5" of rack space it is a PDP-11 model 15 (first generation)
Re: PDP 11/15
Paul, That is so cool! How much space would it take? That is my first computer (outside of timesharing and Z-80 homebrew). My first job was on the PDP-15 to transcribe the APOLLO analog range tapes of the lunar experiments, primarily the seismometer moonquake data for the University of Texas Geophysics Lab (they designed the seismometers). The machine was a pretty good wall, 4-5 racks. On the other side of the room were the FM/Direct Bell and Howell analog range tape players and demodulators. I ran this stuff all night long, hanging tapes, using the scope to adjust analog heads for the best signal and transcribe to the digital tape. NASA was not interested in this stuff anymore, they were onto Skylab. The ALSEP lunar stations were TEG powered and would go on for decades transmitting, probably still are. All we got was freetime gratis from the range stations to point at the moon and hang a tape, the data was always bad and a challenge to tweak heads the best we could. We had a Versatec electrostatic plotter to output the continuous seismic record as I was decoding the tapes. Anytime there was an 'event' on the plotter, I had Dr. Yosio Nakamura's home number to call him in and take a look. Many nights, we re tweaked heads, to get the last bits of clean seismometer data. Randy Trivia: As I hung a tape out of sequence once, Fortran coders fixed that next day. Next time it happened, the TTY chatters, RANDY! DIDN'T YOU ALREADY ENTER GMT JULIAN DATE XXX:XXX:XXX It was a all night job alone in the computer room, and I am listening to Foghat between tape hangs and alignment. From: cctalk on behalf of Paul Anderson via cctalk Sent: Tuesday, June 18, 2019 7:16 PM To: General Discussion: On-Topic and Off-Topic Posts; cct...@vax-11.org Subject: PDP 11/15 I bought a large package of DEC gear last year and it came with a PDP 11/15. I have no need for this classic, and put it on the list. A few people responded, but because of my problems, I never followed up with them. For those who responded, I apologize for dropping the ball. If anyone is interested in it, please contact me off list. BTW, I have started on pulling a few things out of the warehouse. Thanks, Paul
Re: PDP 11/15 or 11/20 frame powersupply and backplane
Hi Jim, I think the box is a BA11-E and a H720 PS, if you want to keep it original. I don't think I have any spare parts right now, but I have a lot to go through yet. Paul On Sat, Dec 5, 2015 at 1:04 AM, jwsmobile wrote: > I'm looking for any of these, starting with most essentially the backplane. > > power supply next, then frame if anyone has one that is empty looking for > some filling. > > Thanks > Jim >
