test-drb June 2007

test-drb@ccmp.vtda.org

224 participants
486 discussions

by cheri-post＠web.de

Jules, have a look at the biggest database for harddisk drives: www.pc-disk.de All you have to do is to click on "producer", then on the left, you can navigate down to the Seagate drives. For the ST1480N, there is the layout of the PCB and the jumper definitions where the termination power is pointed out as well. Regards, Pierre > > > Does anyone happen to have a reference for the termpwr jumpers on a Seagate > ST1480N 425MB SCSI disk? > > The only online reference I've found so far is set out to use the old DOS font > with line drawing characters in it, and nothing I've been able to find in > Firefox (or elsewhere in Linux) has been able to display it properly :-( > > I know the termpwr jumpers are 7 and 8 down the left side of the drive, but > deciphering the characters used in the corresponding truth table is proving > tricky. > > (I've having another look at the NeXT Cube; I assume that the drive is > currently expecting termpwr from the bus, but the NeXT isn't supplying it) > > > ta > > J. > _______________________________________________________________________ Jetzt neu! Sch?tzen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

16 years, 10 months

Old Telephony Switches - Available/Free

by billdeg＠degnanco.com

Speaking of old telephony switches...my building seems to have been once a telephone relay substation. If anyone is really interested in having this stuff, let me know privately and I can take pictures, etc. There are a lot of old component cards, wires, wall boxes, etc. "Western Electric" etc. in the basement. I do not know much about this stuff. Looks like it was last upgraded in the mid 70's. Location - Wilmington, Delaware USA Bill

16 years, 10 months

What are the really unusual or weird computers?

by mike.hatch＠mclennan.co.uk

My experience is SDS9300 - 24bit Elliott 803B - 39bit - one restored and working at Bletchley Park Digital PDP-7 - 18 bit Digital PDP11-45 LEO 326 - ? bits can't remember > Message: 12 > Date: Thu, 28 Jun 2007 12:01:16 +0100 > From: Roger Holmes <roger.holmes at microspot.co.uk> > Its got Ampex > TM4 mag tape drives (not industry standard 7 or 9 track, these are > ten track units with hubs the same design as professional audio tapes > and the 2 and 3 inch wide video tapes once used by TV broadcasters). Our SDS9300 had TM4 drives but I don't remember them being 2 and 3 inch wide, I thought they were 0.5 inch, but then that was 35years ago. The Elliott 803B had 35mm tape drives, sprocket driven, derived from film handlers, tape made by Kodak. Mike Hatch Looking for a PDP-7 (some hope!)

16 years, 10 months

Billy Pettit real disappointment (Vol46 Iss78 M16)

by mike＠brickfieldspark.org

----- Original Message ----- From: <cctalk-request at classiccmp.org> To: <cctalk at classiccmp.org> > Not enough UK list members, I suspect. I don't know where they all are... > not > on uk.comp.vintage, that's for sure. Maybe there are just more > vendor-specific > mailing lists for the UK scene [1] than there are for the US or something. > Newbie here Uk based. > A big Venn diagram with DEC in the middle? ;-) > I'd go for that Mike Hatch Looking for a PDP-7 (some hope!)

16 years, 10 months

What are the really unusual or weird computers?

by mike.hatch＠mclennan.co.uk

My experience is SDS9300 - 24bit Elliott 803B - 39bit - one restored and working at Bletchley Park Digital PDP-7 - 18 bit Digital PDP11-45 - LEO 326 - ? bits can't remember > Message: 12 > Date: Thu, 28 Jun 2007 12:01:16 +0100 > From: Roger Holmes <roger.holmes at microspot.co.uk> > Its got Ampex > TM4 mag tape drives (not industry standard 7 or 9 track, these are > ten track units with hubs the same design as professional audio tapes > and the 2 and 3 inch wide video tapes once used by TV broadcasters). Our SDS9300 had TM4 drives but I don't remember them being 2 and 3 inch wide, I thought they were 0.5 inch, but then that was 35years ago. The Elliott 803B had 35mm tape drives, sprocket driven, derived from film handlers, tape made by Kodak. Mike Hatch Looking for a PDP-7 (some hope!)

16 years, 10 months

Billy Pettit real disappointment

by dm561＠torfree.net

------------------Original Message(s): Date: Thu, 28 Jun 2007 15:52:56 -0700 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: Billy Pettit real disappointment To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <4683D958.2968.16663E7 at cclist.sydex.com> Content-Type: text/plain; charset=US-ASCII On 28 Jun 2007 at 14:52, Jules Richardson wrote: > Yet another oddity discovered today: it would seem that the rotating magnetic > fixed-head disk in the Burroughs L-2000/3000/4000/5000 machines wasn't for > secondary storage (as I'd assumed), it was the primary store in place of the > core typically found in systems of the time. I bet there can't be many > machines around which had rotating store as the primary memory. Not at all uncommon during the 1950's. (e.g. LGP-30) In fact, the Univac SS-80 that I mentioned not only has a drum as main memory, but it's synchronized to the card reader. There were two machines in the Univac "Solid State" series; the SS-80 for conventional 80-column Hollerith cards and the SS-90 for Univac 90- column cards. The layout on the drum was different for each. The "solid state" refers not to transistors (which were used mostly to drive indicator lamps), but rather to the magnetic cores used not for memory, but for logical operations; one clock cycle per core. The master clock was driven with 6 4X150 power tetrodes. Very unusual--and very reliable for its day. Cheers, Chuck -----------------Reply: Nevertheless unusual for a machine in the L's size and price point; these were essentially desk-sized accounting computers (posting machines) used in banks and numerous small offices. The sealed fixed-head disks were indeed very reliable; secondary storage (when there was any, other than hard copy ledger cards) was on PPT, EPC and on some models mag stripe cards and up to 4 digital cassette drives. Later models (L6000 onwards) used 2102 RAMs ($800/2K). BTW, the L's predecessor (E series) did use core memory and a device called a core counter, a special core that emitted a pulse for every 10th pulse in. And to link this to another thread, I believe I still have a copy of Lunar Lander for the L series; no display of any kind, just a Selectric type golf ball printer. And speaking of golf balls, there was also a golf game for them, as well as lots of ASCII art. Here's hoping that one of the few people who have one of these (other than Bletchley) will manage to get one going one of these days... mike

16 years, 10 months

old modems (was Telephony switches)

by silent700＠gmail.com

Not my first modem (that would have been the Vicmodem on the CBM Vic 20,) but probably the oldest one I put to actual use was an Andersen-Jacobson 300 baud model. It has disappeared into the maze of junk in my basement so I don't have the full spec on it. But it was direct connect, had heavy-duty toggles on the front and a classy woodgrain veneer on the top and sides :) Believe it or not I used it from about 1993-1995, in the leaner days when a lot of my gear came from the dumpster at the local community college.

16 years, 10 months

What are the really unusual or weird computers?

by dm561＠torfree.net

-----------------Original Message: Date: Sat, 23 Jun 2007 13:50:40 -0400 (EDT) From: der Mouse <mouse at Rodents.Montreal.QC.CA> Subject: Re: What are the really unusual or weird computers? > It is too bad Windows and the PC group didn't continue the > OpenFirmware concept. [...] It was a bad move that has cost > millions if not billions of dollars worth of lost productive time. I think having an OS that crashes weekly - daily, or worse, in many cases - and needs a complete ground-up reinstall at least annually has cost their customers far more. /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B ------------------Reply: I usually ignore the MS- and WIN-bashing that is apparently a basic requirement for anyone wishing to be taken seriously in the computing field, but just for the record: My main system has been running Win98SE more or less 24/7 since it was released and although the hardware has been upgraded several times it has never had a ground-up reinstall (although I will do one Real Soon Now). Yes, although a BSOD is a very rare event, it does misbehave occasionally but that's not surprising considering all the obscure software that has been installed on it over the years. I have never lost any data (except as a result of my own carelessness) and except for a couple of virus incidents all that's required when it does misbehave is a reboot while I get a cup of coffee. My clients' systems with much more stable software environments are even more reliable and any problems are almost always hardware or operator related; even monthly crashes would not be tolerated for long. If your system crashes daily or even weekly, I'd recommend that you find a qualified computer professional to fix it for you... mike

16 years, 10 months

What are the really unusual or weird computers?

by ajp166＠bellatlantic.net

> >Subject: Re: What are the really unusual or weird computers? > From: "Liam Proven" <lproven at gmail.com> > Date: Tue, 26 Jun 2007 16:36:50 +0100 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 25/06/07, Chuck Guzis <cclist at sydex.com> wrote: >> On 25 Jun 2007 at 18:14, Liam Proven wrote: >> >> > I am a biker myself - pedal and motorcycles both - and don't know much >> > about cars, but I don't believe I've ever seen a car with a starter >> > button. Maybe in a museum. >> >> Liam, you must not be old enough. Most cars made before 1951 or so >> had one--I clearly recall the one on my aunt's 1950 Hudson. My brother had a '69 baracuda when a few performance mods that the ignition lock was only to "enable" it and the button for the starter was under the dash where a foot could do it. Securtity by obscurity. >But American cars are /weird/ compared to the rest of the world. (I >live in Europe and have travelled extensively there, grew up in Africa >and have visited Asia as well as N America.) Really! I had a Saab that had a three cylinder engine that burnt two cycle mix (oil in gas) like an old outboard. If that wasn't weird enough starting was turn on ignition, set choke and pull cord. Yes it had a pull cord to start it no electric starter. >Automatic transmission seems ubiquitous, which AFAICT is pretty much >unique to N America, /but/ most people still drive these huge, >tank-like petrol-guzzling monsters, whereas the rest of the world >(that can afford new cars at all) prefers smaller, lighter, more >efficient machines which cope better with traffic and produce less >waste and environmental damage - though that's incidental to their >owners for the large part, what matters is that they are cheaper.) I drive a toyota small pickup 2.2liter engine (smallest) and dirt cheap to feed and lots of room for racks! Great for gathering system and all. >It's too fiddly that way, but then, I mainly drive Windows with the >keyboard anyway. And since I prefer and use 20yo IBM Model M >keyboards, I don't have a Windows key, either - so it's Ctrl-Esc, up, >return, return. :?) I do that and people watching are amazed it's possible! Really helpful when the mouse quits or worse isn't recognized for some odd reason. I just wish someone would make a PC keyboard without the numeric keypad at all, just slice it off to the right of the cursor keys and get rid of four inches of wasted space. Allison

16 years, 10 months

Classic HP forums?? - plotter questions

by wacarder＠earthlink.net

>>Does the service manual contain schematics? If so, it should >>be easy to find out which pins are used. > >I am scanning the schematics right now and will post them >shortly. If somebody can take a look at them and decipher >them for me, that would be GREATLY appreciated! The interface has a 15 pin male adapter, with 8 pins on top and 7 on bottom. I have added a link to the schematics at the bottom of the HP7202A Plotter page on my web site. Go to: http://www.woffordwitch.com/HP7202A.asp and click on the link at the bottom of the page. Ashley http://www.woffordwitch.com

16 years, 10 months

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test-drb June 2007