test-drb July 2012

test-drb@ccmp.vtda.org

196 participants
250 discussions

by kevin_anderson_dbq＠yahoo.com

Tony wrote: > > NOTE: the number to the right of the period is 30 (1Eh), NOT 3 (03h) > > Even pickier: It is a "period", NOT a "decimal point", nor "radix point"; > ^^^^^^ > So what is it called in the UK? We call the end-of-sentence marker a > 'full stop', not a 'period'. > > > it serves as punctuation separating an integer, and a 2 digit decimal > > integer. > > Does that mean that the correct way to pronounce the verisons are > 'three - thirty' and 'three - thirty one'? I personally would have pronounced these MS-DOS version numbers variously as "three point three," "three three," "three point three oh," "three three oh," "three point three one," or "three three one." As to the earlier part of this thread, on which systems had these various versions of MS-DOS: Yes, indeed Zenith provided/used 3.31. I used to own a copy that had upgraded to for my Z150 PC-compatible computer back in 1987/88 and after. That particular computer and all its software are now in Seattle, part of the collection of the Living Computer Museum. Kevin Anderson Dubuque, Iowa, USA

11 years, 9 months

Was someone in Iowa still looking for a VAX? Possible road trip this weekend.

by useddec＠gmail.com

I had talked to someone from Iowa on the list a while back about a small vax, but they were worried about the shipping. I might have someone going there this weekend. I might be in Iowa City again in about a month. Thanks, Paul

11 years, 9 months

IBM 7090 mainframe!

by elson＠pico-systems.com

Date: Mon, 30 Jul 2012 09:43:31 -0700 From: "Chuck Guzis" <cclist at sydex.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: IBM 7090 mainframe! Message-ID: <50165743.1836.50913E at cclist.sydex.com> Content-Type: text/plain; charset=US-ASCII On 28 Jul 2012 at 14:51, Peter Van Peborgh wrote: > > Does anyone know (of) anyone running/restoring an IBM 7090, early 60s > > vintage? I am about to clear out a friend's collection of vintage > > computer bits and I may find relevant modules and documentation, h/w > > and s/w. > I think a real find would be a can of 7090 core oil. Wow, I think any of this gear would be very unlikely to have been saved. I know Washington University had some SAGE pieces in a warehouse, but I haven't seen any 7090-vintage stuff in ANY museum collection. It is kind of a big hole in their collections. The tube stuff all went in the dumpster as soon as transistor and core memory came in, and the early transistor machines had an even shorter life than most computer generations. Hmmmm, now that I think of it, I think WU also had a 7094 memory unit - all tubes, kind of in the transition between tube and transistor. I remember it because an address wire had burned up and somebody had threaded a wire through all the burned places to get it running again. A horrible kluge job, too. Hmm, that one was not oil-cooled, but maybe the damage I saw was WHY they went to oil cooling. Jon

11 years, 9 months

H7202KA power supply

by iamcamiel＠gmail.com

On Tue, Jul 31, 2012 at 1:43 AM, Michael Thompson <michael.99.thompson at gmail.com> wrote: >> From: Camiel Vanderhoeven <iamcamiel at gmail.com> >> Date: Sun, 29 Jul 2012 17:25:15 +0200 >> Subject: Re: H7202KA power supply >> >> Replacing the output caps on the 7213 power supply fixed the VBB >> output. However, the + and - 15 V outputs are now completely dead. I'm >> fairly certain those voltages were ok when I started. These are from >> the 7211 module. >> >> Not having any schematics, I traced a few wires. Looks like there's >> circa +160V and -160V and +14V and -14V coming from the main regulator >> (H7200). The 7211, like the 7213, uses a 3527A, which is driven by a >> 32.5 KHz clock signal from the main regulator. No picofuses anywhere >> as far as I can tell. >> >> Camiel. > > The VAX 730 uses almost the same power supply. > Docs for all of the power supplies that you have are here: > http://bitsavers.org/pdf/dec/vax/730/MP01270_11730_Engineering_Drawings_Apr… I didn't realise that. Thanks for pointing it out! Schematics! Camiel.

11 years, 9 months

IBM 7090 mainframe!

by cube1＠charter.net

7090 and 7094 are discrete transistors, not tubes. 709 is tubes. All three exist in collections, I think, though maybe not in running condition Google will help out find them. Jon Elson <elson at pico-systems.com> wrote: >Date: Mon, 30 Jul 2012 09:43:31 -0700 >From: "Chuck Guzis" <cclist at sydex.com> >To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> >Subject: Re: IBM 7090 mainframe! >Message-ID: <50165743.1836.50913E at cclist.sydex.com> >Content-Type: text/plain; charset=US-ASCII > >On 28 Jul 2012 at 14:51, Peter Van Peborgh wrote: > > >> > Does anyone know (of) anyone running/restoring an IBM 7090, early 60s >> > vintage? I am about to clear out a friend's collection of vintage >> > computer bits and I may find relevant modules and documentation, h/w >> > and s/w. >> > >I think a real find would be a can of 7090 core oil. > > >Wow, I think any of this gear would be very unlikely to have been saved. >I know Washington University had some SAGE pieces in a warehouse, but I >haven't >seen any 7090-vintage stuff in ANY museum collection. It is kind of a big >hole in their collections. The tube stuff all went in the dumpster as >soon as >transistor and core memory came in, and the early transistor machines had >an even shorter life than most computer generations. Hmmmm, now that I >think of it, I think WU also had a 7094 memory unit - all tubes, kind of >in the transition between tube and transistor. I remember it because an >address wire had burned up and somebody had threaded a wire through >all the burned places to get it running again. A horrible kluge job, too. > >Hmm, that one was not oil-cooled, but maybe the damage I saw was >WHY they went to oil cooling. > >Jon

11 years, 9 months

Hewlett Packard 10B calculator

by rampaginggreenhulk＠yahoo.com

Is there any way of opening these things w/o destroying them, or their appearance anyway?

11 years, 9 months

Looking for Data I/O "calibration extender" 910-1521

by chrise＠pobox.com

After removing the PROMs from my RX02 controller and attempting to extract their contents, I've discovered that the Unipak for my Data I/O System 19 has a failure. It's returning Error 70 whenever socket 6 is accessed. Of course socket 6 is the one the 7643 PROMs need to go in. Error 70 means something's wrong with the "bit supply". Data I/O built a "calibration extender", P/N 910-1521 that was used to enable probing of the Unipak while it was raised up and out of the main chassis. It would sure make it easier to work on this thing if I had access to said extender. Does anyone have one they would be open to loaning out for a short while while I attempt repair of this unit? Or, better yet, does anyone have one they want to sell/trade? Chris St. Paul, MN USA -- Chris Elmquist

11 years, 9 months

cctech Digest, Vol 107, Issue 47

by michael.99.thompson＠gmail.com

> From: Camiel Vanderhoeven <iamcamiel at gmail.com> > Date: Sun, 29 Jul 2012 17:25:15 +0200 > Subject: Re: H7202KA power supply > > Replacing the output caps on the 7213 power supply fixed the VBB > output. However, the + and - 15 V outputs are now completely dead. I'm > fairly certain those voltages were ok when I started. These are from > the 7211 module. > > Not having any schematics, I traced a few wires. Looks like there's > circa +160V and -160V and +14V and -14V coming from the main regulator > (H7200). The 7211, like the 7213, uses a 3527A, which is driven by a > 32.5 KHz clock signal from the main regulator. No picofuses anywhere > as far as I can tell. > > Camiel. The VAX 730 uses almost the same power supply. Docs for all of the power supplies that you have are here: http://bitsavers.org/pdf/dec/vax/730/MP01270_11730_Engineering_Drawings_Apr… -- Michael Thompson

11 years, 9 months

PDP11/05 front panel switch

by cube1＠charter.net

They are actually pretty common C&K toggle switches, especially if it is not one of the momentary ones. DigiKey, Mouser, etc. Or eBay are places you can start your search. Camiel Vanderhoeven <iamcamiel at gmail.com> wrote: >Hi Again, > >While I'm still struggling with the powers supply in the /84, I >decided to also take a good look at the /05. Amazingly, the power >supplies on this one (1972) are 13 years older than those on the /84 >(1985), yet their outputs look absolutely perfect. Plugged in the >cards, and it seems to work, apart from one annoying little thing: one >of the front panel switches is bad. I noticed it when I was >depositing, then reading back some data, then took a multimeter to >determine that it's the switch itself that's broken. Cosmetically it >looks ok, but it doesn't work. It's just one of the address/data >switches, all other switches work fine. Are there any replacements for >these switches to be found? > >Camiel.

11 years, 9 months

Does anybody have the CD for this book

by microcode＠zoho.com

I just bought a copy of Computer Organization and Design, Third Edition: The Hardware/Software Interface, Third Edition (The Morgan Kaufmann Series in Computer Architecture and Design) Quality: Used - Very Good And it is in nice condition but missing the CD which is a bummer since the Appendices are not printed in the book itself but are all contained in the CD. Does anybody happen to have a copy of this I could ftp or download somehow? Thank you.

11 years, 9 months

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test-drb July 2012