test-drb November 2018

test-drb@ccmp.vtda.org

150 participants
133 discussions

by jnc＠mercury.lcs.mit.edu

> From: Mattis Lind > Thanks Noel for sorting this out. Eh, de nada. But thank you. >> I wonder if the ucode in the two versions is identical? The uROM chip >> numbers should give it, (if they are the same on both versions, albeit >> in different locations on the board), but I have yet to check. Does >> anyone happen to know? OK, so the situation here is pretty complicated. To start with / make things worse, that CPU uses lots of PROMs. Lots and lots and lots and lots of PROMs. For the data paths board (M7260), both major versions appear to contain the same PROMs (going by the DEC part numbers), but the chip location (Exx) numbers are all different. For the control board (M7261), the C, E ('early' version) and F ('late' version) etch revisions each contain mostly the same PROMs, but apparently with slight differences between the sets of PROMs in each (as reflected in different DEC part numbers). For details see: http://gunkies.org/wiki/PDP-11/05#Control_PROMs to which I have just added all the gory details. As to getting the contents of all of them dumped in machine-readable form - oi vey! >> on the earlier version (prints for that version are in the GT40 prints >> online It turns out that I have hard-copy prints for the "C" etch revision of the M7261, which do not yet appear to be online; the GT40 prints have the "E" etch revision. I will scan the pages for that revision of the board, and put them up 'soon'. (I'm not doing the whole print set, it's about 1" thick, and most of them are for other things anyway, like MM11-L memory, etc.) Noel

3 years, 5 months

Font for DEC indicator panels

by jnc＠mercury.lcs.mit.edu

> From: Toby Thain > To get closer I'd need better images of the panels. Hi, I borrowed a DEC inlay from someone (a KA10 CPU bay) and scanned a chunk of it (as much as I could fit into my A4 scanner :-) at 200 dpi: http://ana-3.lcs.mit.edu/~jnc/tech/jpg/KACPUPanel.jpg I have a TC08 inlay, but it's currently being used in my QSIC display (until we can get the RKV11-F/RPV11-D inlay done :-), and I didn't want to yank it out. As far as I can tell, it's the same font on the two of them. > the closest I know of off the top of my head is Akzidenz Grotesk. The Akzidenz Grotesk Medium is indeed very, very close (other than the zero). Do you happen to know if that font available for use in non-commercial settings? Thanks! Noel

4 years, 1 month

Motorola EXORciser M6800 System

by osi.superboard＠gmail.com

Since a few days, my EXORciser Development System is finally able to boot from floppy diskettes. Previous attempts have shown that the Motorola EXORciser M68SFDC1 floppy disk board used has a special modified ROM version. This was probably written for an 8-inch drive, in which the Write protect and Direction signal were inverted. For the sake of simplicity, I have used free inverter on the board to invert the signals accordingly. After adjusting the PLL frequency, reads and writes from the card are now error-free. And all without FDC, only clever programming by Motorola software engineers in the early 76? Originally, the EXORdisk system was a dual drive with two 8 "units. This I have replaced with a double drive of two 5.25 inch units. An Epson and a TEAC, which can be jumpered to 360 rpm. Luckily, 2HD floppy disks are easy to R&W. I also got a GOTEK floppy emulator running, which I can boot from. Thanks to Roland Huisman, Bitsaver has some interesting floppy disks that convert to HFE format work perfectly. This format makes the Gotek drive most reliable. Now to my question. The vintage computer forum at http://www.vcfed.org/forum/archive/index.php/t-44638.html mentioned some interesting manuals. Archive.org has some manuals, Bitsaver does not have manuals about the M6800 development system. If someone already owns scanned manuals to the following list M6800 Basic Interpreter Reference Manual M6800 Macro Assembler reference Manual M68SFDU Exordisk 11/111 Disk `Drive Unit Maintenance Manual M6800 Exorciser 11 User's Guide M6800 Exorciser User's Guide MEX68PP1 PROM Programmer Module Supplement M6800 Exorciser User's Guide I would welcome any feedback or questions --THOMAS

4 years, 8 months

anybody have MOVIE.BYU?

by rdawson16＠hotmail.com

The famous Brigham Young University 3D graphics program, by Dr. Hank Christensen. I am looking for the fortran source, it should be 7 files: DISPLAY SECTION UTILITY TITLE COMPOSE UPDATE MOSAIC Any docs related too. Thanks for letting me beg. Randy

4 years, 8 months

Free to a good home: Honeywell/Bull DPS-6 workstation / server (Seattle, WA)

by derschjo＠gmail.com

Hi all -- I picked this DPS-6 up over the summer and it's just taking up space (quite a bit of space) in the corner of my basement. This is a custom 16-bit, bitsliced, microcoded CPU from the early 80s with (I believe) 8mb of memory, and ethernet. It would originally have run a version of GCOS. It's about the size of a large-ish minifridge, but a bit deeper. It's also quite heavy! It's a neat machine, but it's very obscure and unfortunately incomplete (it is missing both mass storage and storage controllers). Otherwise, it is complete and in good condition (albeit a bit dirty). So you can see why you'd really want to have it in your collection . If anyone's up for a project, drop me a line. Local pick up in Seattle, WA. Thanks, Josh

5 years, 2 months

eBay: 1982 Prime Computer

by jnc＠mercury.lcs.mit.edu

This is listed under the informative title "vintage computer": http://www.ebay.com/itm/291934825422 which leads me to post it here under a more informative title, hoping that someone here has a soft spot for Primes! Noel

5 years, 4 months

HP-2250 in Salt Lake City

by Tim＠Rikers.org

Someone on this list, I don't remember who, asked me if I was interested in this, and then dropped it off. I've not gotten around to doing anything with it, and I could use the space back. If anyone is interested, holler. HP 2250 Measurement & Control Processor Pictures are the same ones that came with it. Photographer unknown. https://photos.app.goo.gl/XjEj8E8vQ8KX9xcg8 If your interested in picking it up, email me directly, please. If you have more information to share, respond to the list. :) If anyone knows more about what this is, I'd be interested to hear. I got these links from Mike on the SIMH list: http://www.hpmuseum.net/display_item.php?hw=986 http://www.hpmuseum.net/document.php?hwfile=5124 http://www.hpmuseum.net/document.php?hwfile=4579 Mine is the "2250M" version. Apparently this heavy beast is "mobile" because it has wheels on it. :)

5 years, 4 months

AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

by guykd＠optusnet.com.au

Ok. Those are quite small. So you have one? Or those are not yours? If you have one, and a way to accurately measure it, making more will be easy for anyone with a lathe. I could do it, but surely you can find a machinist closer to home? Guy At 01:03 PM 10/11/2018 +0000, Riesen Thomas wrote: >Guy, >I am looking for small motor pulley ... see pic ... >Regards >Thomas > >-----Urspr?ngliche Nachricht----- >Von: Guy Dunphy [mailto:guykd at optusnet.com.au] >Gesendet: Samstag, 10. November 2018 13:25 >An: Riesen Thomas <thomas.riesen at predata.ch>; General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> >Betreff: Re: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B > >At 12:03 PM 10/11/2018 +0000, you wrote: >>Hi all >> >>Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive >>Mitsubishi M2894-63B? >> >>If there also the appropriate ribbon gummies available, I would be very >>happy. >> >>Regards >>Thomas > > >Do you know what they look like, and the dimensions? >Because I have these. http://everist.org/pics/misc/IMG_1655_pulley_800.jpg > >_Maybe_ they were off Mitsubishi drives, not sure. Had them in a box of floppy drive related bits for a loooong time, and have no recollection of where they came from. >These are 49.0 mm OD, hole 4.7 mm dia. And this is Australia, with 50Hz mains. > >Guy > > >Attachment Converted: "f:\email\attach\Pully_8Zoll_02.jpg" > >Attachment Converted: "f:\email\attach\Pully_8Zoll_01.jpg" >

5 years, 9 months

50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

by thomas.riesen＠predata.ch

Hi all Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive Mitsubishi M2894-63B? If there also the appropriate ribbon gummies available, I would be very happy. Regards Thomas

5 years, 9 months

Data Systems Design DSD-4140 microcode PROMs

by jzatar2＠illinois.edu

Hello Everyone, We found a PDP-11 QBUS card cage with a KDF11 and some other cards (RAM, ROM, some basic peripherals) which included a DSD-4140 card. Unfortunately, the DSD-4140 is missing one of it's microcode PROMs for some reason. Does anyone else have one of these cards? It'd be really helpful if we could get some dumps of the 4 microcode PROMs so we can compare what we have and look into replacing what we don't have with an adapted modern part. (and if anyone goes to the trouble to read the 4 microcode PROMs, there's also an 82S137 that deserves to be dumped). Here's a picture of the card in question: https://i.imgur.com/tzYjPYF.jpg Regards, Joe Zatarski

5 years, 9 months

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test-drb November 2018