[cctalk] Re: PDP11 and Ultrix 11
On Fri, Oct 20, 2023 at 1:46 PM Henry Bent wrote: > I have a SIMH installation of Ultrix-11 3.1 on RL02 drives. Two RL02s is > enough for a base system and four (which would be what the DQ614 provides, if > it worked) would be more than enough for sources and work, etc. Yes. 40MB should be plenty of room. 10MB was definitely not enough for 2.9BSD, but at the time, I only had one RL02 drive. > The Ultrix-11 RL driver does fancy things with overlapped seeks that I'm sure > works on real hardware but on the DQ614, not so much. Ah... I can see that. It wouldn't surprise me if the DQ614 got most of its development and testing with RT-11 in mind, and possibly some RSX-11. I remember that the DEC RL controller (at least for PDP-11, not as sure about the RL8A) did support some pretty handy things for a multi-user OS, like overlapping seek, but I think in all the years I worked with DEC gear, only a few machines had multiple RL drives. Mostly I saw them as data transfer devices or for primary storage on small (single-user) systems. We did have one larger system, an 11/24 with four RL02, running RSTS/E and whatever we were using for accounting software. I didn't work on the machine myself except to physically disconnect and pack and move it from one site to another when we consolidated our operations back into one building. -ethan
[cctalk] Re: PDP11 and Ultrix 11
On Fri, 20 Oct 2023 at 13:28, Ethan Dicks via cctalk wrote: > On Wed, Oct 18, 2023 at 10:21 AM Henry Bent via cctalk > wrote: > > Interesting. My Dilog DQ614 (ST506 emulating RL02s) specifically does > not > > work with Ultrix, but does work with 2.xBSD and v7, so I would not > > necessarily assume that a third-party board was going to work with > > Ultrix-11's drivers. > > I do not know what drives Ultrix-11 supports but it wouldn't be > shocking to find that you can't use an RL02 as the root install > device. An RL02 was only big enough for the base install of 2.9BSD > and not big enough for base+sources so I was never able to rebuild my > kernel (it all worked fine on an RK07 at work). > I have a SIMH installation of Ultrix-11 3.1 on RL02 drives. Two RL02s is enough for a base system and four (which would be what the DQ614 provides, if it worked) would be more than enough for sources and work, etc. The Ultrix-11 RL driver does fancy things with overlapped seeks that I'm sure works on real hardware but on the DQ614, not so much. -Henry
[cctalk] Re: PDP11 and Ultrix 11
On Wed, Oct 18, 2023 at 10:21 AM Henry Bent via cctalk wrote: > Interesting. My Dilog DQ614 (ST506 emulating RL02s) specifically does not > work with Ultrix, but does work with 2.xBSD and v7, so I would not > necessarily assume that a third-party board was going to work with > Ultrix-11's drivers. I have personally installed 2.9BSD on an 11/24 with RL11 and RL02 so I _know_ that works (and I would expect the DQ614 to work there too). I have a DQ614 but the Rodime drive that came with it was toast and I only recently got the RT11 utility to fiddle drives so I haven't ever tried to use mine. I may end up tossing an ST225 or ST241 on my DQ614 when I get around to trying it. I do not know what drives Ultrix-11 supports but it wouldn't be shocking to find that you can't use an RL02 as the root install device. An RL02 was only big enough for the base install of 2.9BSD and not big enough for base+sources so I was never able to rebuild my kernel (it all worked fine on an RK07 at work). In the past, I never did anything with 2.11BSD or Ultrix-11 because I didn't have a new enough setup (most of my gear came from the 70s and early 80s - no J-11 anywhere until recently). As mentioned, if it's a well-implemented MSCP SCSI controller (UC07, CQD220...), it should "just work" on any system there are MSCP drivers for. Cheers, -ethan
[cctalk] Re: 11/15, 11/20 systems and parts, more
On Fri, Oct 20, 2023 at 12:11 PM Jon Elson via cctalk wrote: > On 10/20/23 03:59, Michael Thompson via cctalk wrote: > > The RICM has an empty 11/20 chassis and the power supply. All it needs is > > the processor backplanes. Is there any chance you have a set of backplanes > > available? > > > I have a DD11-PK backplane (Part No. 70-11523) with a few > bent pins. None are bent so badly they can't be > straightened. From 11/04 or 11/34. Free if you pay shipping. DD11-PK is for 11/34 (top two slots for CPU). PDP-11/04 uses standard DD11-DK (single-board CPU, doesn't need special slots). The 11/20 is entirely different. It has three 4-slot backplanes for CPU boards with "random" wiring and Unibus out on AB of final slot. It would be unusual but not impossible to see the 11/20 CPU backplane assembly outside of a BA11-C cabinet. If one had 12 DEC backplane blocks, one could make a replacement but it would be quite an undertaking. Might be easier to make a PCB-based replacement with modern connectors. Could also upgrade power input scheme while at it. -ethan
[cctalk] Re: 11/15, 11/20 systems and parts, more
On 10/20/23 03:59, Michael Thompson via cctalk wrote: The RICM has an empty 11/20 chassis and the power supply. All it needs is the processor backplanes. Is there any chance you have a set of backplanes available? I have a DD11-PK backplane (Part No. 70-11523) with a few bent pins. None are bent so badly they can't be straightened. From 11/04 or 11/34. Free if you pay shipping. Jon
[cctalk] Fw: Re: 11/15, 11/20 systems and parts, more
Sent from AOL on Android - Forwarded Message - From: "ED SHARPE" To: "lini...@portsmon.org" , "Ed Sharpe" Cc: "Mark Linimon" Sent: Thu, Oct 19, 2023 at 8:29 PM Subject: Re: [cctalk] Re: 11/15, 11/20 systems and parts, more I have one pdp 11/20 aith procesdor abd ore untested in the garage have not taken for display at our museum. If you had something we likedre it could be yours Want hp 3000 series 2 or 3 Hp 2883 or 2884 disc or 2888 disc (plus some other stuff) A nice large early stash of historic semiconductors Early wireless( as in radio no routers!) Anything related to mccarty wireless telephone of San Francisco Related things to Francis or Ignatius mccarty ERly DeForest radio equipment. Exotic hp computers There us a few areas Nike missile Related hardware etc Thanks ed sharpe archivist f or smecc museum Sent from AOL on Android On Thu, Oct 19, 2023 at 5:02 PM, Mark Linimon via cctalk wrote: I sincerely doubt I could afford a PDP-11/20 but I still have nostalgia for the first machine I used at university. So I have to ask. mcl
[cctalk] Re: 11/15, 11/20 systems and parts, more
I might. Do you need the boards also? I'm up now if you want to call. Paul 217 766 7690 On Fri, Oct 20, 2023 at 3:58 AM Michael Thompson via cctalk < cctalk@classiccmp.org> wrote: > The RICM has an empty 11/20 chassis and the power supply. All it needs is > the processor backplanes. Is there any chance you have a set of backplanes > available? > > On Fri, Oct 20, 2023, 2:35 AM devin davison via cctalk < > cctalk@classiccmp.org> wrote: > > > I have a few systems in rough shape, and need parts. Let me know what you > > find, i am interested. I mainly run my unibus 11/34 systems, but i have a > > few q bus syatems in need of parts and repair. > > > > Thanks, > > > > Devin D. > > > > On Thu, Oct 19, 2023, 8:02 PM Mark Linimon via cctalk < > > cctalk@classiccmp.org> > > wrote: > > > > > I sincerely doubt I could afford a PDP-11/20 but I still have nostalgia > > > for the first machine I used at university. So I have to ask. > > > > > > mcl > > > > > >
[cctalk] Re: 11/15, 11/20 systems and parts, more
Hi Devin, I'm up for a few minutes now, or call me after 7 or so any night. Paul On Fri, Oct 20, 2023 at 1:35 AM devin davison via cctalk < cctalk@classiccmp.org> wrote: > I have a few systems in rough shape, and need parts. Let me know what you > find, i am interested. I mainly run my unibus 11/34 systems, but i have a > few q bus syatems in need of parts and repair. > > Thanks, > > Devin D. > > On Thu, Oct 19, 2023, 8:02 PM Mark Linimon via cctalk < > cctalk@classiccmp.org> > wrote: > > > I sincerely doubt I could afford a PDP-11/20 but I still have nostalgia > > for the first machine I used at university. So I have to ask. > > > > mcl > > >
[cctalk] Re: 11/15, 11/20 systems and parts, more
The RICM has an empty 11/20 chassis and the power supply. All it needs is the processor backplanes. Is there any chance you have a set of backplanes available? On Fri, Oct 20, 2023, 2:35 AM devin davison via cctalk < cctalk@classiccmp.org> wrote: > I have a few systems in rough shape, and need parts. Let me know what you > find, i am interested. I mainly run my unibus 11/34 systems, but i have a > few q bus syatems in need of parts and repair. > > Thanks, > > Devin D. > > On Thu, Oct 19, 2023, 8:02 PM Mark Linimon via cctalk < > cctalk@classiccmp.org> > wrote: > > > I sincerely doubt I could afford a PDP-11/20 but I still have nostalgia > > for the first machine I used at university. So I have to ask. > > > > mcl > > >
[cctalk] Re: 11/15, 11/20 systems and parts, more
I have a few systems in rough shape, and need parts. Let me know what you find, i am interested. I mainly run my unibus 11/34 systems, but i have a few q bus syatems in need of parts and repair. Thanks, Devin D. On Thu, Oct 19, 2023, 8:02 PM Mark Linimon via cctalk wrote: > I sincerely doubt I could afford a PDP-11/20 but I still have nostalgia > for the first machine I used at university. So I have to ask. > > mcl >
