test-drb March 2002

test-drb@ccmp.vtda.org

292 participants
932 discussions

DSQD Drives (Was: RE: Diags/Boot image for Altos 580)

by ajp166＠bellatlantic.net

The best way to write QD media is to use a TEACFD55GFV or FD55F as both work. Then the actual media is the BROWN or 360k stuff that has been bulk erased. The resulting disks will be reliable aswsuming the drive hasn't been munged or the formating incorrect. A PC FDC can drive these drives and will/can format them. You will need a utility program that does disk reading and formatting with CP/M formats. FYI: the TEAC drives are my favorite for any 80track format either single or double sided. I use them as substition for RX50s as well. Allison

23 years, 1 month

DSQD Drives (Was: RE: Diags/Boot image for Altos 580)

by rigdonj＠cfl.rr.com

At 12:14 PM 3/17/02 -0500, you wrote: >> IIRC the Floppy on an Altos 580 is DSQD. > >Am I correct that while different from standard >DSDD, they are *not* GCR drives? > >What other machines might carry these drives, The SB-180s used them. A lot of the later CPM and early MS-DOS (but not necessarily IBM compatible) machines used them. For example, they were popular additons to the Sanyo 55xs. I just found a pair of Teac 80 track drives inside of an old Multibus system (The same one that had the GAPP cards in it). can I >hook one up to a standard PC controller in a box >running DOS, and then duplicate the disks? Yes, MS-DOS can handle them. There's a DOS device driver that I can't think of the name of but it will let you specify the number of sides, tracks and sectors. It will handle them nicely. > >> I had one that had the CMI hard drive replaced with a Seagate ST225. So I >> know they will take similar configured Hard Drives. I think they will take >> 10, 15 and 20 Meg HDs. > >This is good to know, ST225s still pop up from time to time... 225s and 251s are handy to keep around since they'll replace a number of OLD hard drives. I've used 225s to replace the dries inside of some of the HP HP-IB disk drives. Joe > >-dq >

23 years, 1 month

IBM System/36 SSP on 5.25"

by ceby2＠csc.com

... back again with my periodic thread on System/36 IBM mini-computers... When I last left you... we were all bitching about SPAM. This week... we're bitching about SPAM?! The 5362 is in good health, and I've started to fool around with actually using it. As soon as I can find the LAN interface for it I'll integrate into the rest of my motteley managerie on line (the better to play with over VPN while travelling). To get to this point I hacked the security file, deliberately corrupted the VTOC and re-installed the SSP. I found scanning the disk sector by sector for appropriate files an... experience. Worked though. The 5360 was successfully moved from a printers workshop into it's temporary storage unit. My back is recovering. The U-Haul van started mysteriously burning oil. Co-incidence? You be the judge. Can't say as I've powered her up -- or even done a proper inventory of part numbers. I'm sure that's all something to look forward to, or at least it will be next time I can spare the day to drive down to Hartford. The 5363 arrived while I was away on client site. I get power and error messages on it right now. Still investigating.... Steve Robertson gets gold stars for his assist along the way. I've acquired his set of System/36 documentation. Slowly it makes it's way across my scanner. The prospect of buying a page feeder gets more appealing every page. Which leads me to the subject line of this e-mail: I have the SSP set on 8" disk, but that's not only a different format but a different version than what's supposed to be used on the late System/36 like a 5363. The 5363 continued to add version numbers to the SSP in a 5.25" version. The 8" stopped around V5. I'd like to bring the 5363 around, but I could use some additional tools to do it. Anyone out there holding onto a 5.25" SSP set? Warmest, SPAM-free regards, Colin Eby

23 years, 1 month

MV-II Diags & Customer Diags

by cdl＠proxima.ucsd.edu

> Date: Sun, 17 Mar 2002 00:28:11 -0600 (CST) > From: Doc Shipley <doc(a)mdrconsult.com> > To: Classic Computers <classiccmp(a)classiccmp.org> > Subject: MV-II Diags & Customer Diags > Sender: owner-classiccmp(a)classiccmp.org > Reply-To: classiccmp(a)classiccmp.org > > I've aquired a copy of each: > > MVII DIAG MAINT TK50 AQ-GM5AN-DN > MV DIAG CUST TK50 AQ-GL5AP-DN > > I'm going to try using dd to generate an image for duplication > tonight. If I can make a bootable duplicate from the image, and if > there are no licensing issues, I'll make the images available. Any > interest or comments? Speaking as someone who did this many years ago (duplicated MV DIAG TK50) it is not a simple dd job. You have to copy the entire structure of the tape, which is something like <tape header> [<file header> <file contents> <file trailer>] <tape trailer> Repeat section between [ ] as many times as there are files on the tape. Each header and trailer block is (I think) 80 bytes, and there are FileMarks at the end of each and every header, trailer, and contents. carl

23 years, 1 month

Switching PSU Theory of Operation / Repair Tips

by dhquebbeman＠theestopinalgroup.com

> Have I missed the start of this thread? I don't recall anything about > SMPSUs here in the last few days... No, believe it or not, SOMEONE BESIDE A SPAMMER HAS DISCOVERED THE LIST ARCHIVES! ;) -dq

23 years, 1 month

Dilog DQ-634?

by djenner＠earthlink.net

Anyone know what a Dilog DQ-634 does? I haven't found any information on the Net except for a couple of places that have them for sale. It obviously interfaces two MFM drives, due to the connectors on it. What DEC drives does it emulate? Is it a never version of the DQ-614, which emulates RL01/RL02s? Thanks, Dave -- David C. Jenner djenner(a)earthlink.net

23 years, 1 month

(fwd) Old Ohio Scientific 1970's Computers for sale

by donm＠cts.com

For those downunder or really hungry for OS hardware. Reply to the address below - not me. - don -- forwarded message -- Path: news20!news-feeds.jump.net!newspump.monmouth.com!newspeer.monmouth.com!news-out.visi.com!hermes.visi.com!news1.optus.net.au!optus!spool01.syd.optusnet.com.au!spool.optusnet.com.au!210.49.20.93.MISMATCH!not-for-mail User-Agent: Microsoft-Outlook-Express-Macintosh-Edition/5.02.2022 Date: Sun, 17 Mar 2002 19:38:35 +1100 Subject: Old Ohio Scientific 1970's Computers for sale From: Nobody <return-path(a)slyfox.org> Newsgroups: misc.forsale.computers.other.misc,misc.forsale.computers.other.systems Message-ID: <B8BAA13B.B1DE%return-path(a)slyfox.org> Mime-version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Lines: 8 NNTP-Posting-Host: 198.142.41.195 X-Trace: 1016354317 6219 198.142.41.195 Xref: news20 misc.forsale.computers.other.misc:122159 misc.forsale.computers.other.systems:61836 see them at http://www.tigersnake.com/computers/index.html offers accepted, all items located in melbourne australia however will ship worldwide and will accept payment via paypal. -- end of forwarded message --

23 years, 1 month

Switching PSU Theory of Operation / Repair Tips

by reversebias＠talk21.com

Re Where does the 600v come from? The SMPSU in question is probably of the 'Flyback' or of the 'Forward Converter' type. In either case the converter O/P Tx primary winding is connected between the +300vdc rail and the collector of the switching transistor. The emitter of the switching transistor is connected by a small resistor to the 0v (-tve) rail. During the conducting period of the switching transistor (lets call it TR4 - it often is) the potential across TR4 is very low, a few volts. Hence virtually all of the 300vdc appears across the primary winding of the O/P converter Tx (lets call it Tx1). The collector of TR4 is therefore at -300vdc. When TR4 is driven into its 'off' period Lenz's Law causes the primary inductance of Tx1 to try to maintain the primary current. The resultant induced emf (due to collapse of primary flux) now produces a +tve potential at the Tr4 collector and a -tve potential at the +dc rail end of Tx1 primary. Hence the Tr4 collector is now 300vdc positive to the +300vdc rail. Therefore the collector of Tr4 is now 600v +tve to the 0v (-tve) rail ofv the PSU. Don't touch its Heatsink while the PSU is switched on. Also allow 4 or 5 mins for the voltages to bleed down after switching the PSU off before touching internal components. (It should give this warning on its nameplate) Hope this is clear and useful - it is 3.30am in the morning here in UK. Regards John Salmon Q&R Engineer

23 years, 1 month

Response to Re: List Management - RESPONSE

by steven_j_robertson＠hotmail.com

>Jay, don't take this too personally, but that answer SUCKS! When will you >be "damn well ready"? The list asked for a solution several weeks ago. I >think it's time to finally do something. The SPAM is not the problem. The problem is the rant that continue long after the SPAM has gone. In this case, there was a single email SPAM followed by forty F***ING replys bitching about all the SPAM coming from the list. The SPAM is not the problem... The real problem is the members that refuse to shut the hell up! Take your whining somewhere else! SteveRob _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

23 years, 1 month

DSQD Drives (Was: RE: Diags/Boot image for Altos 580)

by ajp166＠bellatlantic.net

Actually one system did use it with hard sectoring, Northstar. All of the others were WDC or 765 based. Allison -----Original Message----- From: Richard Erlacher <edick(a)idcomm.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, March 17, 2002 2:28 PM Subject: Re: DSQD Drives (Was: RE: Diags/Boot image for Altos 580) >The one I had used a standard sort of FDC, so it's not likely it was hard >sectored, nor is it likely it used some off-beat, e.g. GCR, modulation scheme. > >Dick > >----- Original Message ----- >From: "ajp166" <ajp166(a)bellatlantic.net> >To: <classiccmp(a)classiccmp.org> >Sent: Sunday, March 17, 2002 11:51 AM >Subject: Re: DSQD Drives (Was: RE: Diags/Boot image for Altos 580) > > >> From: Douglas Quebbeman <dhquebbeman(a)theestopinalgroup.com> >> >> >> >> IIRC the Floppy on an Altos 580 is DSQD. >> > >> >Am I correct that while different from standard >> >DSDD, they are *not* GCR drives? >> >> >> DSQD generally means 80 track two sided drives such as >> TEAC FD55F or G and double density encoding. Typically >> they store around 800k. >> >> FYI that can mean hard or softsectored as that is controller >> not drive dependent. >> >> >What other machines might carry these drives, can I >> >hook one up to a standard PC controller in a box >> >running DOS, and then duplicate the disks? >> >> >> Kaypro with Advent turborom, AmproLB, Micromint SB180 >> to name a few. >> >> >This is good to know, ST225s still pop up from time to time... >> >> >> St225, ST251 and related drives are fairly common. >> >> Allison >> >> >

23 years, 1 month

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test-drb March 2002