test-drb December 2016

test-drb@ccmp.vtda.org

156 participants
199 discussions

by curiousmarc3＠gmail.com

Probably a question for Tony's encyclopedic knowledge. I just scored two HP 9825, one a later "T" option and one "B" version with all the fixings (i.e ROM packs). They both seem to work save the usual tape drive which I have not gotten to yet. Both have the flexible disc ROM. What kind of discs can I hook up? I think the HP 9895 8" floppy would work. What about the HP 82901 5.25" floppy drive? How do I read/write program files from the disc interface? Marc Sent from my iPad

7 years, 5 months

Happy DEC-10!

by lars＠nocrew.org

Happy DEC-10, everyone! As a gift, we offer some steaming hot, freshly baked bits. Straight out of the oven, here are over 80 PDP-10 programs built from source code. http://github.com/PDP-10/its

7 years, 5 months

SGI Indigo, WTB Power supply? Burning smell?

by billdegnan＠gmail.com

On Dec 9, 2016 11:09 PM, "devin davison" <lyokoboy0 at gmail.com> wrote: > > I have a indigo that is not getting much use. I believe it has the R4000 > with the better power supply, and maxed out ram.(whatever that may be, i > want to say 192 Mb, but i coud be mistaken, i can fire it up and verify if > needed) I have not used it much. Prom battery is dead, i used to jump it > with a AAA battery temporally to get past a Time error at startup, but > never got around to soldering a proper battery into it. It should have the > maxed out memory, as well as the keyboard and mouse to go along with it. > > I am in the process of paying off 2 SGI onyx 2's, if the indigo with the > keyboard and mouse would be of interest, i can sell it to you to put money > twords my Onyx fund. > > --Devin I recently gave my spare SGI stuff away. It's cheaply bought on Ebay, I'd just get a parts unit there. That said, the fan could be the source of the smell and the part to go first from my limited experience when a fan dies is the video card. Bill Degnan twitter: billdeg vintagecomputer.net

7 years, 5 months

IBM System/360 Model 44 Pamphlet

by billdegnan＠gmail.com

IBM System/360 Model 44 Pamphlet from Nov 1968 http://www.vintagecomputer.net/browse_thread.cfm?id=659 Bill

7 years, 5 months

PDP-8 OS/8 versions

by chd＠chdickman.com

Has anyone ever described the OS/8 version history? I have some DECtapes that are V3D and I have found some RX01 images >from the V3D Combined Kit. The programs that are common to both are different versions, so V3D changed over time. Then there were the DECmates and there were changes made to support them. I see V4 referenced. There are also some sources online, but it isn't clear how they correspond to the usable device images. I have been looking at these online resources mostly, but I have found others. http://www.ibiblio.org/pub/academic/computer-science/history/pdp-8 http://www.pdp8.net/ Are there other better resources? Are there source distributions in the original state for example? >From what I have seen, the combined kit has the best support for the PDP-8/e and its devices. That's the hardware I have and so that is what I am concentrating on. Hoping to trigger some conversation. -chuck

7 years, 5 months

VAX expert 'needed'

by jnc＠mercury.lcs.mit.edu

So, looking at the list of 'wanted pages' on the Computer History' wiki: http://gunkies.org/wiki/Special:WantedPages the top page or so of entries are all about various Vaxen. Is there a volunteer our there to sign up as an editor there (note: applications have to be approved, which can take a couple of days, due to busyness on the part of the admin) to start writing up VAX content? Noel

7 years, 5 months

IBM System/360 Model 44 Pamphlet

by COURYHOUSE＠aol.com

yes this is mentioned in the pamphlet... Ed# In a message dated 12/9/2016 12:57:01 P.M. US Mountain Standard Time, billdegnan at gmail.com writes: > It's curious that the emulation feature, which adds software emulation of > those instructions, isn't mentioned, and in fact I haven't seen it > mentioned anywhere.

7 years, 5 months

hate when I run out of interrupts and exceptions

by james.w.stephens＠gmail.com

And don't have any spares on the shelf. The title on this just was funny, maybe it's time to crash, since it's late. VINTAGE-DEC-DIGITAL-Empty-case-of-the-VAX-VMS-exceptions-interrupts-CASE-ONLY-/ http://www.ebay.com/itm/291941009551 (posted for levity, no warning on this posting)

7 years, 5 months

M8728 MK11 memory board info?

by jnc＠mercury.lcs.mit.edu

So, does anyone know of any documentation (especially engineering drawings) for the M8728, which is the 256KB board for the MK11 (originally), also later useable in the VAX-11/750 and VAX-11/730? The M8728 and M8750 are in fact the same PCB, with different DRAMs (16K or 64K) and different jumper configurations, and since M8750 prints are extant, most of the M8728 is documented, but the M8728 also has some discrete components that the M8750 lacks (I think to produce voltages used by the earlier DRAMs that the later ones don't). Yes, I could work this all out by tracing leads, but I'd rather not! I have produced a table of all the jumper differences, etc and will be creating a page to document all this, but actual documentation for the M8728 would be helpful. Noel PS: Does anyone know the formal names for the M8728? The 64KB board, the M7984, is the MS11-K, but I don't know the one for the larger one (if it was ever assigned). The M7850 seems to be called the MS750/MS730 (per the prints).

7 years, 5 months

Could somebody please help me identify this board?

by michael.99.thompson＠gmail.com

> > Date: Tue, 6 Dec 2016 22:57:08 -0700 > From: Eric Smith <spacewar at gmail.com> > Subject: Re: Could somebody please help me identify this board? > > On Tue, Dec 6, 2016 at 7:32 PM, Jon Elson <jonelson126 at gmail.com> wrote: > > > It appears to be an extended-length Multibus II board with 2 8-bit DACs > on > > it. Output for an XY scope? > > > > Extended-length Multibus. Definitely not Multibus II, which uses Eurocard > 6Ux220 form factor with two 96-pin DIN 41612 connectors. > The components are on the wrong side of the board for a Multibus. If I remember correctly, DY 4 Systems, now part of Curtiss-Wright, made extended depth Multibus boards. Michael Thompson

7 years, 5 months

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test-drb December 2016