test-drb June 2016

test-drb@ccmp.vtda.org

196 participants
290 discussions

old friend is slimming down the warehouse

by connork＠connorsdomain.com

+1 You tell em Will! -Connor K On Jun 21, 2016 4:05 PM, William Donzelli <wdonzelli at gmail.com> wrote: > > > I have sent Todd his contact info. He is willing to let one person come in and take pics and post to the group. He does NOT want to move one or 2 items of the most value; he wants to move out pallets of stuff. He is not closing shop; he just wants to move out some really old equip that has been there for years. > > Be sure to tell your friend that the mainframe collectors can > certainly make cubic feet of equipment leave the warehouse quickly! > > -- > Will

8 years

Tandy TRS0-Model 2000 Computer Monitor required

by barythrin＠gmail.com

The 2000 isn't fully compatible either i thought since its one of the few PCs using the 80186 processor. When i acquired mine (also without a monitor and i think without keyboard or software ) i sort of accepted id likely not get it running. But perhaps the ?software is out ?there and less of a concern than i thought. I didn't know it was compatible with the cm-1 but i never checked what video card mine had. Still an interesting system historically.

8 years

Tough to Diagnose issue with PDP 11/40 CPU

by jnc＠mercury.lcs.mit.edu

> From: William Degnan > The problem was a missing KJ11 Ah. Well, if you want to add one (I assume you've just re-jumpered the machine for the moment), I do have one we can copy (for the PC etch) - I'm assuming here that originals are now unobtainium. Also, if you have the KE11-E, but not the KE11-F (the former is a prereq for the latter), and would like one, I have one I have no use for (Unix doesn't use that version of the PDP-11 floating point), and would be willing to trade it for something I do have a use for. > My error. Lesson: Always check everything. Yes, always a good rule when dealing with recovered machines. I always take them apart and go through them completely, verifying all cables, etc from the original documentation. Noel

8 years

Tough to Diagnose issue with PDP 11/40 CPU

by jnc＠mercury.lcs.mit.edu

> From: William Degnan > The IOT step is bombing (?) and loops through the addresses: This may be a pointless question, but just to clear the ground first: the CPU is otherwise functioning reasonably well? E.g. it's not dropping the 020 bit when reading words from memory? (That would convert the '220' new PC in the vector to '200', and produce exactly the behaviour you are seeing.) If it is otherwise more or less working, so this is specific to IOT trap handling, I agree with Fritz - a KM11 would be a big help. Noel

8 years

Tough to Diagnose issue with PDP 11/40 CPU

by billdegnan＠gmail.com

I thought I'd throw this one out to those who know more than I about the PDP 11/40 I am working with DaveR on vcfed.org/forum who asked me to run the following program as a test from the front panel: 20 - 220 ; IOT trap vector (New PC) 22 - 340 ; IOT trap vector (New PSW) 200 - 012706 ; MOV #600,SP 202 - 600 204 - 240 ; NOP 206 - 0 ; HALT 210 - 4 ; IOT 212 - 240 ; NOP 214 - 0 ; HALT 216 - 0 ; HALT 220 - 0 ; HALT 222 - 0 ; HALT START the program running from address 200. ---------------------- Problem is - The IOT step is bombing (?) and loops through the addresses: 204 206 210 200 204 206 210 200 endlessly. Anyone care to speculate which CPU card is the culprit? -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

8 years

Tough to Diagnose issue with PDP 11/40 CPU

by billdegnan＠gmail.com

On Jun 30, 2016 1:19 AM, "Fritz Mueller" <fritzm at fritzm.org> wrote: > > Hey Bill, > > Do you have a KM11 maintenance card? Guy Sotomayor here sells kits and/or assembled boards at http://www.shiresoft.com/products/km11/KM11%20Replica.html. I built one up myself based on a layout by Tom Uban at http://www.ubanproductions.com/museum.html > > The easiest way to get to the bottom of this since you have a nice, short, repro case would be to step through the microcode with a KM11 and see where it goes awry. From that point, its fairly easy to come of up a list of boards to swap and/or chips to check. > > If you want to go to the chip checking stage, you'll need some board extenders and a logic probe, they are pretty cheap. Or you can grab a surplus logic analyzer and some DIP clips off eBay if you want to get posh! > > I just went through this process with my 11/45, it was pretty educational. > > --FritzM. Fritz, It turns out that I was missing the KJ11 my cpu cards were wired to expect. On the 11/40 this module is the little M7237 card for space E of slot 3. The machine in question did not come with this card, I assumed it was not needed until I checked the cpu jumpers and discovered my error. Should have done this 1st! It was impossible to run the CQKC diagnostic for 11/40 or 11/45 - http://www.vintagecomputer.net/temp/disassembly.txt Instructions using IOT in particular. Bill Degnan twitter: billdeg vintagecomputer.net

8 years

Tandy TRS0-Model 2000 Computer Monitor required

by brendan＠mcneill.co.nz

Looking for a Tandy TRS-80 Model 2000 compute monitor. Wikipedia description here: https://en.wikipedia.org/wiki/Tandy_2000 <https://en.wikipedia.org/wiki/Tandy_2000> The monochrome is model VM-1 Monitor, the colour is CM-1 Monitor. Many thanks Brendan --------------//---------------- brendan at mcneill.co.nz +64 21 881 883

8 years

Y Combinator is restoring one of Alan Kay's Xerox Alto machines

by curiousmarc3＠gmail.com

And here is Ken's new post in the series http://www.righto.com/2016/06/restoring-y-combinators-xerox-alto-day.html Marc > On Jun 21, 2016, at 10:59 PM, CuriousMarc <curiousmarc3 at gmail.com> wrote: > > The restoration is physically happening at my place. As noted below we have > a small and quite knowledgeable group of people contributing, including > actual hardware when we are missing a part (thanks Al !). A few of us are > chronicling this on our favorite media from our favorite angle. > I like to make short videos trying to convey the inside story of the > restoration, on my YouTube channel: > https://www.youtube.com/curiousmarc > It's interspersed with all the other restorations, but two videos so far: > https://youtu.be/YupOC_6bfMI > https://youtu.be/xPyqQXFC2yw > Ed Thelen likes to collect every bit of raw information floating around, > including some of the team emails and throw them into equally raw site, as > he does for the IBM 1401 restoration effort at CHM: > http://ed-thelen.org/RestoreAlto/index.html > Carl Claunch methodically recounts everything he does every day (and he does > a lot), so when he works on the Alto, you'll know every detail: > http://rescue1130.blogspot.com/ > Ken Shirriff makes deeply researched, superlative detailed posts on his > blog. These are reference pieces, I admire them a lot: > http://www.righto.com/2016/06/y-combinators-xerox-alto-restoring.html > And it gets discussed on the Y-combinator (the owners of the machine) and > hopefully here too. > Seeing the interest, I will make an effort to post new links when they > become available, unless of course Master Al beats me to it. > > Marc > > -----Original Message----- > From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Al Kossow > Sent: Monday, June 20, 2016 8:54 AM > To: cctalk at classiccmp.org > Subject: Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines > > http://www.righto.com/2016/06/y-combinators-xerox-alto-restoring.html > https://news.ycombinator.com/item?id=11929396 > http://ed-thelen.org/RestoreAlto/index.html > >> On 6/20/16 8:51 AM, Al Kossow wrote: >> I post just went up on Saturday. It's nice that both CHM and LCM folks >> are helping with this. >> >> >>> On 6/20/16 8:41 AM, Liam Proven wrote: >>> http://www.righto.com/2016/06/y-combinators-xerox-alto-restoring.html >>> >>> Found via: >>> >>> http://www.osnews.com/story/29261/Xerox_Alto_restoring_the_legendary_ >>> 1970s_GUI_computer >>> >>> There are 2 videos up so far, with disassemblies that may interest >>> CCmpers. >>> >>> Some people from the list are involved, including Al Kossow, but I >>> haven't seen the link posted. >>> >> >

8 years

IBM 6360 8 inch floppy drive

by walton.david＠sky.com

Hi I collect vintage IBM laptops, have just joined the community, and wonder if anyone can help with the following: 1. Can write a Teledisk image of concurrent CP/M for Displaywriter to two 8 inch floppy disks which I can supply? 2. Can solder a cable fie me which will interface an ibm 6360 8 inch floppy to a PC. I am unable to do this myself. 3. I have an external 5.25 floppy adapter/a inside an ibm ps/2 p70 and wonder if the external 37 pin connector is pin compatible with the 37 pin connector of the ibm 6360 8 inch floppy drive? I thought about connecting two out of the 3 cables from this drive to an IBM displaywriter (supplying the correct voltages etc) and the 37 pin connector to my external 5.25 adapter/a card? Thanks for your help. David

8 years

On Offer: MAI Basic Four Mini in Chicago

by silent700＠gmail.com

It's that time of year when a young man starts to take stock of reality (for better or for worse) and decides that his load must be lightened. This time the machine with on the block is an MAI Basic Four deskside minicomputer. I'm not sure of the exact model but it can be seen in the first three pictures in this gallery: https://picasaweb.google.com/102190732096693814506/HaulOf10315?noredirect=1 Note: nothing else in that gallery is on offer at this time - maybe later. However other random hardware may be thrown at you during the transfer. I have not powered it up. I was told it was working when taken out of service many years ago, but we all know how that goes. I have some documentation for it that I will be scanning (some of which is not already on Bitsavers) but I will send it along to whoever takes the machine afterwards. I do not have any disk or tape media for it. I'm not looking to get a lot for it - trades would be fine, preferably for something that I can lift myself, however I am also looking for a working DEC RX02 drive or a later IBM terminal controller (3174 or similar) with Ethernet that I can use to run IBM real terminals on Hercules. Preference goes to: 1) someone local who can haul it away. I am not presently equipped to deal with shipping anything this large. 2) someone will will get it sooner rather than later 3) someone who will make it sing again. If you're coming to VCFMW in September, the storage unit holding the MAI is just a few miles away from the hotel and we can do the loud-out then. If you're here sooner, even better. -j

8 years

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test-drb June 2016