test-drb April 2010

test-drb@ccmp.vtda.org

172 participants
242 discussions

by ethan.dicks＠gmail.com

Hi, All, I was cleaning out a pile of stuff left behind when one of my brothers moved to California and ran across what looks like an IBM Aptiva 2142 Media Console - a pop-top CD-ROM and floppy box with a 50-pin cable back to the main box... http://www.systemsalchemy.org/howto/aptiva/intro.html Formerly, there appears to have been a lot of Aptiva information at http://wymette.home.att.net/aptiva.htm but the site is gone (I think AT&T just stopped serving "home pages" recently) and archive.org isn't pulling up anything on that old site at the moment. Another referenced site was http://members.rogers.com/airchan/ (which is available at http://web.archive.org/web/20021213012640/http://members.rogers.com/airchan/) happens to have had a pointer to the original IBM hardware manual - http://web.archive.org/web/20021201092020/http://members.rogers.com/airchan… which at least mentions how to dismantle the Media Console. >From what I have been able to find, the CD-ROM drive in the media console is an IDE unit not SCSI, so I _think_ that while the connector may resemble a SCSI-1 cable (50-pin "Blue Ribbon" connector) it may not carry SCSI signals. There was at least one reference I found to a "host card" in the Aptiva that was not being described as a SCSI card, but I couldn't find anything that states it definitely is or is not SCSI. I don't happen to have an Aptiva, but if someone out there does, I'd rather it go to someone than get broken down for recycling at Free Geek Columbus (which is where it will end up if it's unloved). I would want 1.2X actual shipping cost from 43202 (box, packaging, incidentals, etc). I see a number of places selling them for about $30 plus S&H, but I doubt they are flying off the shelves at that price. Cheers, -ethan

14 years, 8 months

seeking PDP-11/93 CABKIT for BA23

by bqt＠softjar.se

Nigel Williams <nigel.d.williams at gmail.com> wrote: > More details and pictures here: > > www.retrocomputingtasmania.com/members/nw-retrocomputingtasmania-com/pdp-11… > > If anyone knows the part numbers for the KDJ11 CABKIT or front/rear > plastic panels for the BA23 that would help me contact suppliers. You know, Google is really simple to use... A quick search on "pdp-11/93 cabkit" gave me CK-KDJ1E-KA. Found, for instance, on http://www.pacificgeek.com/productdetail.asp?ID=1932313. (in turn from http://www.pacificgeek.com/showallitems_bb_list.asp?Code=CK) You can probably find information on all other stuff you are looking for by using Google as well. However, finding the actual items might be another story. I wish you luck, though. > My aim is to run RSTS/E v10 on this machine so I am open to > suggestions for the simplest path to this goal. > > I have a SBOX CQD223A/TM SCSI card which I would be willing to swap or > sell for the QBUS variant or some other manageable RSTS/E compatible > storage device. That is a Qbus controller, I assume you know this? The Sbox is just a question of handles, which can be removed. Johnny

14 years, 8 months

Desoldering Chips, was Re: Can someone confirm this chip equivalence?

by marvin＠west.net

Another thing that works (but you have to be careful) is to use an xacto knife to cut the leads using the uncut leads as a "stop". At the point most of the leads are cut, you can use a standard cutter to clip the last lead on each side. (Still trying to figure out how this is related to chip equivalence.) > If I slip, that would be no good... nevertheless, that's probably > what I'll end up doing (the cutting, not the slipping part!) > > Joe.

14 years, 8 months

I'm,looking for PDP-11 CPU tests

by brain＠jbrain.com

I sent the DEC ROM info to the VT220 Font author, and he responded with thanks and also wanted to know if anyone had PDP-11 CPU tests. I noted he might want to join here, but I thought I'd start the ball rolling on his request. Jim -- Jim Brain, Brain Innovations (X) brain at jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com

14 years, 8 months

eBay disaster

by trag＠io.com

> > Date: Tue, 6 Apr 2010 19:54:27 +0100 (BST) > From: ard at p850ug1.demon.co.uk (Tony Duell) > I haev found it's impossible to predict the prices that things will sell > for on E-bay. Several times I've seen things with an opening bid of > perhaps $5. I've thoguht that it was a rare an interesting item and put > in a bid of $100 for it (and ecpected it to go for a lot more), only to > find I end up winning it for the opening bid. Conversely there have been > times when I've thought 'nobody will want that' and put in a sensible (if > somewhat low) bid, only to find it sells for much more. Time also plays a part, as in, who happens to be looking for that type of item and how many. What sells for very little one month may go for hundreds a month later. I designed and ran off some circuit boards for 16 MB Macintosh IIfx SIMMs and offered sets of four (64 MB RAM total) on Ebay. The first set sold for over $270. As one would expect, the price declined from there until it went under $50 which was about what I felt was my minimum considering the effort to assemble them. The second to last set sold for about $50 and the set that made me quit went for about $25. Then I waited a month or two, offered them again with exactly the same auction listing and the price was back up over $120. It's like there's a customer-base refresh function at work or at least a time variant demand function. Jeff Walther

14 years, 8 months

eBay disaster

by hachti＠hachti.de

Hi folks, could someone please explain me THIS? http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=190385486840 I don't sell on eBay very often. And from time to time I see people paying astronomical sums for more or less junk. But this time it was me offering stuff - and what did I get? I have no clue who would sell me a used RK05 disk pack in unknown condition for that price. But this was a new in a box one....! What did I do wrong? Was it the winner of the auction who has 0 eBay points? There was absolutely no trace of fraud on my side. I did neither bid with another account nor did I even ask someone to bid on my auctions to drive up the price. That's what I got from it. I hope that the lucky 0 points high bidder on my pack is someone who really exists... Regards, Philipp -- http://www.hachti.de

14 years, 8 months

Are QIC 1000 tapes rare?

by teoz＠neo.rr.com

A few weeks back I purchased a Tandberg TDC 4120 drive at a recycler.For some reason I like collecting different tape drives and removable media, maybe just incase I find media with data I want to restore. Browsing ebay I found 6 new QIC 1000 tapes for it starting at $1 with $5 shipping "IMATION MAGNUS 46165 QIC 1000- 1.2 GB-B NEW" and put in a bid thinking nobody uses this stuff anymore. With 30 minutes currently left it has hit $117.50 and all the bids are users with 2000+ feedback. So are these things that rare, or do people snag it up to keep the prices expensive for corporate users who need tapes? I can't really see a company needing new tapes (1.2GB) these days, drives maybe to restore files but not new tapes.

14 years, 8 months

eBay disaster

by ken＠seefried.com

Philipp Hachtmann wrote: > What did I do wrong? When offered in an open market with asymmetrical information and indeterminatedesire, if an item sells for more than certain people on this list think itshould, the people who spent more are idiots/clueless/scum/damaging the vintagemarket. When offered in an open market with asymmetrical information and indeterminatedesire, if an item sells for less than certain people on this list think itshould, the people who spent less are parasites/snipers/scum/damaging thevintage market. This is a once a month or more thread. Seriously, do we really need to rehash it? KJ

14 years, 8 months

Terak Variable Density

by cclist＠sydex.com

I may be asked to handle some Terak 8500-series "variable density" floppies. The documentation isn't very specific about these and since I don't have them in hand, I'm guessing that they're really just FM+MFM and not actually zoned bit density floppies. Do I assume correctly? Thanks all, Chuck

14 years, 8 months

IBM 51TD Floppy Drive pinout

by cclist＠sydex.com

This would be IBM P/N 4240513; apparently a 36-pin header on the 8" floppy drive. Anyone know what the signal pinout is? Thanks, Chuck

14 years, 8 months

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test-drb April 2010