test-drb

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101090 discussions

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>

9 years, 7 months

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

9 years, 7 months

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

9 years, 7 months

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. >>> >> >

9 years, 7 months

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

9 years, 7 months

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

9 years, 7 months

Mim.Update.UU.SE

by bqt＠softjar.se

Some people might have noticed that Mim.Update.UU.SE have not been reachable the last week. This is because the University have decided to put all systems behind firewalls, which hurt the Update computer club pretty bad. For people who would still like to get access to Mim, I have now setup telnet to listen to a second port in addition to port 23. Mim is now accessible by telnet on port 10023 as well, which is not blocked by an firewall. In addition, I also added ftp on port 10021 in addition to port 21, so people who would like to get to files on Mim by ftp can do so again. This also prompted me to make a couple of improvements to BQTCP/IP for RSX. The changes are that the telnet daemon can now be set to listen to an alternative port, and can also listen to several ports. I also added the capability to the ftp client to specify which port to connect to. The TCP/IP package can be found at ftp://mim.update.uu.se:10021/ However, if you have the previous version of TCP/IP for RSX, you cannot access this address, as the previous version ftp client did not accept a port argument. So it's a bit of a chicken and egg thing. But using some intermediate system, you can get the disk image to the machine, and install the new version, after which things will be possible to use more or less as before. One more thing: NEMA, my very tiny EMACS clone for RSX, have gotten a lot of work done lately, and if anyone is interested in this tool, I really recommend that you fetch the latest version. A port to VMS is also included with the files now, courtesy of Erik Olufsen. NEMA is available at ftp://nema at mim.update.uu.se:10021/ Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

9 years, 7 months

Dual Head Rainbow Video

by robert.jarratt＠ntlworld.com

Just in case anyone is interested, I have just posted a video on YouTube of my Rainbow 100+ (not the one I am selling) running in a dual head configuration. The quality of the video isn't great, but it might interest a few people. You can find it here: https://youtu.be/y4p9plwjRio Regards Rob

9 years, 7 months

DL11 configuration for pdp11gui

by jnc＠mercury.lcs.mit.edu

> From: Fritz Mueller > So far I haven't seen any place in PDP11GUI to set anything other than > port and baud rate You might have to use native OS tools to do that. On Unix, that will be 'stty'; on Windows, you'd have to use native Windows tools to do that; if you go to the Device Manager, select your serial port, and click on 'Properties', it has a tab ('Port Settings') for that (or, should I say, it used to - not sure about the most recent versions, they're making it all smart-phone like for brain-dead lusers). > From: Don North > Mostly PDP11GUI does not care, either 7b or 8b. I'm kind of surprised to hear that; I assumed that PDP11GUI can download binaries, and for that, 8-bit is kind of necessary? Side-story: when I started bringing up my -11's, the first one I did was an -11/23. So I needed a way for my Windoze box to talk to the -11's console line, for ODT. I was too lazy to figure out how to use some existing software, so I decided to write some. I wanted to be able to use it (later) to talk to one -11 from another, and I didn't know how to do complex terminal hacking under Windoze anyway, so I decided to write it under Unix. V6, to be exact (I consider all later versions to be unholy perversions - well, V7 isn't too bad, I guess), running on Ersatz11 on the Windoze box. Later, I wanted to be able to load .LDA files, which are 8-bit binary. One problem. Native Unix V6 doesn't have the ability to output 8-bit binary over a serial line (or input it, for that matter). When I first started using V6 at MIT, the DSSR people had already totally re-written the TTY driver, and added that capability, so I never ran into this problem before. Also, the native V6 stty() call isn't very flexible, and there are no spare mode bits. So they'd added a new system call, ttymod() (sort of like ioctl(), but done before it), to control all their wonderful extensions. I decided not to replicate that, but rolled my own upwardly compatible extension to stty(), which adds all that extended semantics. From there, it wasn't too much work to get sending the absolute loader down the serial line in its original binary form (which means all the old console bootstraps work, too), and using that to load .LDA files. Noel

9 years, 7 months

Some questions about the MC6839

by spc＠conman.org

(My original message to cctech has yet to appear. I thought I might try the cctalk list). While Motorola never shipped the MC6839 [1] the binary is available [2] and I've been playing around with it [3]. While it's not producing the exact same results as I get on a more modern machine, it appears to be "close enough" for me to be happy with it. But I am having one issue that I can't figure out. The documentation for the FMOV operation says: FMOV Move (or convert) arg1 -> arg2. This function is useful for changing precisions (e.g. single to double) with full exception processing for possible overflow and underflow. Okay. And to call it [4]: ------------------------------------------------------------------------------ |Function|Opcode| Register entry conditions | Stack entry conditions ------------------------------------------------------------------------------ | FMOV | $1A | U = precision parameter word| push arg | | | Y -> argument | push precision param word | | | D -> fpcb | push ptr to fpcb | | | X -> result | call FPO9 | | | | pull result ------------------------------------------------------------------------------ For moves, U contains a parameter word describing the size of the source and destination arguments. The bits are as follows, where the size is as defined in the fpcb control byte Bits 0-2 : Destination size Bits 3-7 : unused Bits 8-10 : Source size Bits 11-15: unused And the size bits are defined as: 111 = reserved 110 = reserved 101 = reserved 100 = extended - round result to double 011 = extended - round result to single 010 = extended - no forced rounding 001 = double 000 = single It appears that to convert from single to double, I would set U to $0001, but the results are *so* far out of whack it's not even funny. I've tried setting U to point to the value $0001 and that doesn't work. I've tried shifting the bits (because in the FPCB they're the upper three bits) and that doesn't work. I've tried reversing the registers and that doesn't work. Does anyone have the actual source code [4]? Or know what I might be doing wrong? -spc [1] A ROM with position independent 6809 object code that conforms (to what I can find) with IEEE 754 Draft 8. [2] Available in the file fpo9.lzh here https://ftplike.com/browser/os9archive.rtsi.com/OS9/OS9_6X09/PROG/ [3] Using a 6809 emulator library I wrote: https://github.com/spc476/mc6809 Not much documentation I'm afraid. [4] Register entry: ROM base address + $003D Stack entry: ROM base address + $003F [5] I'm lead to believe that Motorola release the code into the public domain.

9 years, 7 months

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