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PDP11 and Ultrix 11

by hupfadekroua

Hello all, does someone have a SCSI disc image of Ultrix 11 for a QBus based (11/73) PDP11. A.

2 years

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Fw: Re: 11/15, 11/20 systems and parts, more

by ED SHARPE

Sent from AOL on Android ----- Forwarded Message ----- From: "ED SHARPE" <couryhouse(a)aol.com> To: "linimon(a)portsmon.org" <linimon(a)portsmon.org>, "Ed Sharpe" <couryhouse(a)aol.com> Cc: "Mark Linimon" <linimon(a)portsmon.org> 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<cctalk(a)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

2 years

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Tandy Model 6000 w/XENIX

by Bill Gunshannon

Is there anywhere I could go where people who are playing with this system hang out? I used to have a couple of very early Model 16's and ran Xenix on them. I also worked with a couple of 6000's in a real production environment. Lately I got interested again and found an emulator that does a real good job and a bunch of rather interesting software for it. Some that wasn't around when I was doing this for a job. In one case, the package has a note that while it installs they couldn't get into it because the first thing it did was ask for username and password. Well, I figured out how to get into it and maybe there are others interested. It's nice to be able to see how real work was done back in the day. I have always wished some of the production software for the PDP-11 had survived, but at least this is a start. bill

2 years

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Livestream 10/21/23 - Liza Loop, Byron Stout, Wil Lindsay & Jim Hall - VCF's YouTube channel

by Jeffrey Brace

This Saturday, Oct. 21, 2023 at 6:30PM EDT, we will livestream to VCF's YouTube channel (https://www.youtube.com/@vcfederation) a talk with Liza Loop, Byron Stout, Wil Lindsay and Jim Hall. We will be talking about Educating today's children with vintage computers. We will take questions from the chat part of YouTube. Future livestreams: 11/4 - Jim Hall - Linux like Unix 11/11 - Liza Loop, Cynthia Solomon, Brian Silverman & Margaret Morabito - Educating students with vintage computers over the decades. I hope to see you there!

2 years

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PDP11 Dilog SQ706a SCSI Controller

by hupfadekroua

Hello all, are there some experiences to install as well as to configure a Dilog SQ706a QBus SCSI controller in a PDP11/73 successfully? The controller in question is working properly, that's executing the self as well as the host DMA connection tests successfully. The format procedure of a physical and of an emulated SCSI drive will be executed with success also. But how to configure the Dilog SQ706a as well as the 11/73 properly, so that the SCSI drive can be accessed as DU0. I'm using an SCSI RSX image on a ZULU SCSI emulator inherited from an 11/73 running successfully using a native DEC SCSI controller. I don't find any successful procedure on the web beside the manuals on bitsavers, which only can be seen as examples. A.

2 years

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M7846 RX11 Unibus floppy controller board documentation?

by Tom Hunter

I was unable to locate schematics and/or a maintenance manual for the Unibus M7846 RX11 floppy controller board. If anyone has these could you please scan them and make them available. Thank you. Tom

2 years

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IBM 5100 discussion

by Christian Corti

I have been pointed to the following discussion https://forum.vcfed.org/index.php?threads/ibm-5110-initial-info.1224000/pag… There, voidstar78 was apparently trying to contact me. Since my mail addresses are all functional (noone else had any problem with them, be it my personal or our museum's address), I wonder what he did, and I don't have a gmail address. I'm not on this forum, and I don't want to register to "yet another forum", so I can't even look at the pictures. But it seems to have been an interesting discussion. Pity it wasn't on this list. Christian

2 years

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Re: IBM 727 tape drive

by Len Shustek

At Mon, 18 Sep 2023 10:55:13 +0200 (CEST) Christian Corti <cc(a)informatik.uni-stuttgart.de> wrote: >as it will be soon of importance to us, I am seeking for the systems >engineering manual and drawings, well, everything about the IBM 727 tape >drive (not the 729!). I especially need the module locations charts and >the module schematics. Just a few weeks ago I donated to the Computer History Museum a set of 14 original IBM black binders of "Type 7xx" manuals from the 1950s, including the 727. That one is likely to be the same as what's on bitsavers, but since it's no longer in hand I can't check. They probably haven't made it through the CHM cataloging process yet.

2 years

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Obsolete Parts.... Unicorn Electronics

by D. Resor

I recently had a need for BC308 transistors. Of course those have been unobtanium for quite some time. My search beyond a distributor then went to eBay where I found Unicorn Electronics. More to the point I see from their website Apple 1, Apple ][ and Apple 1a Kits along with Apple 1 and Apple II parts are available. I thought some here might find this useful. https://unicornelectronics.com/ Don Resor

2 years

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Re: VT100: Failing 2114 Chip Replaced With One With The Same Fault

by Rob Jarratt

> -----Original Message----- > From: wrcooke(a)wrcooke.net <wrcooke(a)wrcooke.net> > Sent: 08 October 2023 04:15 > To: rob(a)jarratt.me.uk; Rob Jarratt via cctalk <cctalk(a)classiccmp.org> > Subject: Re: [cctalk] VT100: Failing 2114 Chip Replaced With One With The > Same Fault > > > > > On 10/07/2023 5:35 PM CDT Rob Jarratt via cctalk <cctalk(a)classiccmp.org> > wrote: > > > > > > I find this really hard to explain. It can't be the chip selection > > logic because then the addresses 0x2400-0x2407 would also fail and I > > checked the CS signal with the logic analyser just to be sure. I also > > checked the address lines directly on the RAM chip for any stuck bits > > and they seemed fine too. > > > > > > > > What are the chances of two 2114 chips failing at exactly the same address? > > Is there some failure mode I might not be considering? > > > > Rob > > Perhaps it isn't the 2114 or its associated circuit at all. Maybe some other > device is being incorrectly selected by that address and driving (half) the bus > low? Just a thought. Many thanks for the suggestion. This hadn't crossed my mind, so I checked. All the things that I could identify on the schematic that connect to the bus (UART, interrupt vector, flag buffer and modem signals) seem not to be enabled. I have looked at what is sinking the data bus, there is a buffer which seems to be OK and the 8251 PIC. The PIC is harder to check but I can see it is not selected and the input pins don’t appear to be shorted. Not really sure what else to consider. > > Will > > If you want to build a ship, don't drum up people to collect wood and don't > assign them tasks and work, but rather teach them to long for the endless > immensity of the sea. > > Antoine de Saint-Exupery

2 years

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