Is The M9312 Boot Module Essential?

I have a PDP-11/24. I have never got very far with it because of power supply problems which I am hopeful will be resolved soon. Looking at the technical manual, it describes an M9312 bootstrap/terminator module. The machine did not come with one of these. I am not sure how the machine could

Re: VAX9000 unearthed

On 2/18/22 15:35, Paul Koning wrote: On Feb 18, 2022, at 3:18 PM, Gary Grebus wrote: On 2/18/22 09:46, Paul Koning wrote: ...The 9000 also had its own I/O bus, XMI, different from BI. I don't know how its performance compares, whether it was worth the effort. XMI already existed as the

Re: VAX9000 unearthed

On 2022-02-18 8:21 p.m., Mark Linimon via cctalk wrote: On Fri, Feb 18, 2022 at 05:25:26PM -0500, Patrick Finnegan via cctalk wrote: Yours will be a lot cheaper to run. Custom ECL chips? I think I can go with "relatively cheaper". Make sure you have a bazillion BTU of air conditioning ...

Re: VAX9000 unearthed

On Fri, Feb 18, 2022 at 05:25:26PM -0500, Patrick Finnegan via cctalk wrote: > Yours will be a lot cheaper to run. Custom ECL chips? I think I can go with "relatively cheaper". Make sure you have a bazillion BTU of air conditioning ... (Yes, I have had experience with ECL, albeit 1970s

Re: VAX9000 unearthed

There's an issue of DTJ dedicated to the 9000: http://dtjcd.vmsresource.org.uk/pdfs/dtj_v02-04_1990.pdf On Fri, Feb 18, 2022 at 11:01:40PM +, Antonio Carlini via cctalk wrote: > On 18/02/2022 17:16, Lee Courtney via cctalk wrote: > > Paul, > > > > What was the timeframe for the MPP? > > >

Re: VAX9000 unearthed

On 18/02/2022 17:16, Lee Courtney via cctalk wrote: Paul, What was the timeframe for the MPP? Lee The earliest DECmpp reference I can find is from 1991: https://eisner.decus.org/anon/htnotes/note?f1=INDUSTRY_NEWS=551.1 You can peruse the service manual here:

Re: VAX9000 unearthed

On Fri, 18 Feb 2022, Paul Koning via cctalk wrote: > From what was just reported, the 6000 series indeed did it that way. > But I think on the 9000 it was an I/O bus too. I definitely remember > some work on XMI based I/O devices, in particular an FDDI card. And > indeed you can find a spec

RE: Testing H745 Regulators

I found a 400V part on Mouser and ordered that. > -Original Message- > From: Jonathan Chapman > Sent: 18 February 2022 21:23 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H745 Regulators > > > I always forget that the

Re: VAX9000 unearthed

Cool! It's the baby version of the two 9000/440s I recently rescued. Yours will be a lot cheaper to run. I'm still working on digesting the documentation for mine before I try to get them running. Pictures of mine in their new home: https://i.imgur.com/sVgkuG9.jpg Patrick Finnegan On Fri, Feb

Re: VAX9000 unearthed

> On Feb 18, 2022, at 4:30 PM, Chris Zach via cctalk > wrote: > >> XMI already existed as the system bus for the VAX 6000 series machines. >> I/O on the VAX 6000's was via an XMI-to-BI bridge. I don't remember the >> exact performance specs on XMI, but it was wider and faster than BI.

Re: VAX9000 unearthed

XMI already existed as the system bus for the VAX 6000 series machines.   I/O on the VAX 6000's was via an XMI-to-BI bridge.  I don't remember the exact performance specs on XMI, but it was wider and faster than BI. I thought XMI was only supposed to be a CPU/memory bus, with IO being done

RE: Testing H745 Regulators

> I always forget that the VAC is the RMS and not the peak-to-peak. I will > look for a minimum rating of 100V. 600V bridge modules are often more cost effective, and more likely to be in stock. That's why I went with the Vishay part I used. If you can't find what you need due to shortages, you

Re: VAX9000 unearthed

On 2/18/22 09:46, Paul Koning wrote: On Feb 18, 2022, at 7:08 AM, Joerg Hoppe via cctalk wrote: Hi, my computer club c-c-g.de could acquire the remains of a VAX9000 ! The machine ran at the GWDG computing center in G?ttingen, Germany, around 1993. Parts of it were in stock of their museum

Re: VAX9000 unearthed

https://en.wikipedia.org/wiki/MasPar says that MasPar was founded by ex-DEC chip VP Jeff Kalb. He took a design done at DEC, for a massively parallel machine inspired by the Goodyear MPP with some changes. DEC decided not to build that so MasPar did and DEC then resold it. The

Re: Testing H745 Regulators

On 2022-Feb-17, at 11:40 PM, Rob Jarratt wrote: >> -Original Message- >> From: Brent Hilpert >> On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote: -Original Message- From: Brent Hilpert 20V on a 10 ohm load: current = 2A. 15V, 1.5A. In this

Re: VAX9000 unearthed

On 18/02/2022 20:35, Paul Koning via cctalk wrote: There also was an effort at one point to adopt FutureBus in DEC systems. We did a pile of design in the network architecture group to figure out how to handle interrupts and bus cycles efficiently; I don't remember if anything actually

Re: VAX9000 unearthed

> On Feb 18, 2022, at 3:18 PM, Gary Grebus wrote: > > On 2/18/22 09:46, Paul Koning wrote: >> ...The 9000 also had its own I/O bus, XMI, different from BI. I don't know >> how its performance compares, whether it was worth the effort. > > XMI already existed as the system bus for the VAX

Re: VAX9000 unearthed

On 2/18/22 13:30, Josh Dersch via cctalk wrote: On Fri, Feb 18, 2022 at 6:55 AM Paul Koning via cctalk < cctalk@classiccmp.org> wrote: Speaking of vector processors: there's a very obscure DEC processor, the DEC MPP. I remember seeing the processor architecture document when it was being

Re: VAX9000 unearthed

On Fri, Feb 18, 2022 at 6:55 AM Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > > > > > Speaking of vector processors: there's a very obscure DEC processor, the > DEC MPP. I remember seeing the processor architecture document when it was > being designed, not sure why. It's a very-RISC

Re: VAX9000 unearthed

> On Feb 18, 2022, at 12:16 PM, Lee Courtney wrote: > > Paul, > > What was the timeframe for the MPP? I thought late 1980s. Just did some searching, which turns up some manuals for the "DecMPP 12000". And a trade press article that says it's a rebadged MasPar machine.

Re: VAX9000 unearthed

Paul, What was the timeframe for the MPP? Lee On Fri, Feb 18, 2022 at 6:47 AM Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > > > > On Feb 18, 2022, at 7:08 AM, Joerg Hoppe via cctalk < > cctalk@classiccmp.org> wrote: > > > > Hi, > > > > my computer club c-c-g.de could acquire the

Re: VAX9000 unearthed

> On Feb 18, 2022, at 7:08 AM, Joerg Hoppe via cctalk > wrote: > > Hi, > > my computer club c-c-g.de could acquire the remains of a VAX9000 ! > The machine ran at the GWDG computing center in Göttingen, Germany, around > 1993. > Parts of it were in stock of their museum for 20+ years. > >

Re: ID these DEC floppy disks

Thanks for that. My memory is now refreshed! Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU Amateur Radio, the origin of the open-source concept! Skype: tilbury2591nw.john...@ieee.org On 2022-02-18 07:51, Sytse van Slooten via cctalk wrote:

VAX9000 unearthed

Hi, my computer club c-c-g.de could acquire the remains of a VAX9000 ! The machine ran at the GWDG computing center in Göttingen, Germany, around 1993. Parts of it were in stock of their museum for 20+ years. See lots of hires-pictures at

Re: ID these DEC floppy disks

http://www.bitsavers.org/pdf/dec/pdp11/xxdp/Turnbull_XXDP_Feb93.pdf This doc gives an overview of the naming. The leading C means PDP-11, but is not used in the file names on the xxdp packs and floppies - you'll see it in