test-drb March 2005

test-drb@ccmp.vtda.org

291 participants
840 discussions

FT: Would like to trade some TK50 ->TK70's

by dholland＠woh.rr.com

Hi, Due to my inability to read a EPay auction correctly, I'm now the "proud" owner of 25 CompacTape tapes. I was looking for CompacTape II's for my TK70 drive.. (oops) Anyone want to trade feel like trading some TK70's for my TK50's? No, I'm not looking for a 1:1 swapping ratio, though I'm not going to complain if it were. :-> All I was looking for was 6-10 CompacTape II's tapes to putter around w/ on my VAX. I also need to admit, I've not tried reading any of these tapes to see if they're good. All but one have their cases. They "look" reasonably well stored to me if that means anything. Dayton OH area. Would kinda prefer to avoid overseas shipping. (sorry) Prefer replies off list: dholland at woh.rr.com (Though honestly, I'm not entirely certain I'm proposing is a fair trade - so friendly comments to that effect will be listened to.) thanks, David

21 years, 1 month

TE10/TU10\

by GOOI＠oce.nl

> The TE10 uses the TE16 transport with a Unibus TM11 interface. > The TU10 used the TU16 transport with the Unibus TM11 interface. > > The TE16 is the redesigned version of the TU16 with a better > tape path, auto-rewind to BOT after tape load etc. > > The TE10 is the better unit although both are the same spec > 800bpi/1600bpi (IIRC) and 45ips (or is it 45ips rewind speed?). > > I used to do a lot of Field Service on the DEC tape drives > and the TE16 was pretty reliable -- with only the tape locking > mechanism breaking (same part as one of the Kennedy drives). > > Bill Hmmm, what are my options when the thin "rubber" layer of the capstan roller went goo, Bill? Capstan roller might not be the correct term, it is the roller that transports the tape to the upper (pick-up) reel. On both my TE16 drives the rubber has become *very* sticky, so I am listening for any solution ... - Henk, PA8PDP.

21 years, 1 month

Cables for RX50 in BA23

by pete＠dunnington.u-net.com

On Mar 24 2005, 23:12, Jerome H. Fine wrote: > >Pete Turnbull wrote: > >Actually it's a 34-way cable, just like the 34-way cable used for a PC > >3.5" drive, though without the "twist" that most PC drive cables have. > > > Jerome Fine replies: > > As usual, you are correct. I suspect that my > error would have been noted as soon as the attempt > to actually plug the 40 pin cable into the 34 pin > header of the RX50. Yes, it would have been obvious and probably not caused any confusion. I only posted the followup in case anyone else who'd not seen the distribution panel went looking for a cable in advance, really. > As for the lack of a twist, I seem to remember that > the twist was only after the first connection, i.e. > on the second connection. Since there is only a > single connection to the RX50, if I am correct, > the twist would not affect anything. That's right. I've used cables like that. -- Pete Peter Turnbull Network Manager University of York

21 years, 1 month

argh

by julesrichardsonuk＠yahoo.co.uk

wuuuuuuuh waaaaaaah wuuuuuuuh waaaaaaah wuuuuuuuh waaaaaaah wuuuuuuuh waaaaaaah wuuuuuuuh waaaaaaah wuuuuuuuh waaaaaaah click click click... I'm sure QIC-24 tape drives were designed for the sole purpose of driving me insane :/

21 years, 1 month

"Thyractors" on the DEC LT33 modified ASR33 Teletype

by pkoning＠equallogic.com

>>>>> "vrs" == vrs <vrs at msn.com> writes: >> I am currently modifying my Teletype ASR33 into a LT33 according >> to the vrs> DEC >> specifications to work with my PDP-8/L. Does someone know what is >> a Thyractor (GE 6RS20SP4B4) ? Some kind of voltage clamping device >> ?. How could I make one, using, for instance a pair of thyristors >> or a pair vrs> of >> zenner diodes ? vrs> thyractor: "A marketing name by DAVIS, the thyractor was a vrs> combination of a low loss choke (the reactor) and a thyristor." vrs> I know NTE still markets a replacement for the 6RS20SP5B5 (but vrs> not the 4B4). Unfortunately, I don't have the detailed specs vrs> for the 4B4. vrs> On the other hand, I think it is just a handy voltage clamp to vrs> keep the semiconductor circuits from seeing the inductive spikes vrs> from the TTY. Shouldn't be too hard to come up with something vrs> else that would work. If it's a voltage clamp, then either back to back zeners, or a MOV should work. MOV might be the better choice since they are explicitly designed as protective devices. Zeners would be ok in the larger sizes, but the small ones may be fragile enough that they don't do well in this application. paul

21 years, 1 month

HP9134A 4.6MB HD on eBay

by jpl15＠panix.com

for $2.99 (yup - 3 bux) http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=167&item=5179025649 Cheers John

21 years, 1 month

Cables for RX50 in BA23

by pete＠dunnington.u-net.com

On Mar 24 2005, 9:15, Jerome H. Fine wrote: > Dennis Boone wrote: > > >Can anyone help me identify the part numbers of the cable(s) which > >would be used to connect an RX50 to an RQDXn (mine's a 3) in a > >BA23 case? Say an 11/53 or 11/73 type of machine? > > > Jerome Fine replies: > > The BA23 normally arrives (i.e. has as standard > hardware) a distribution panel for the RX50 dual > floppy drive and RD5n hard drives. A 50 pin flat > cable with a female header at both ends is used to > connect the controller (RQDX3 in your case) to this > distribution panel. The distribution panel has a > 40 pin connection available in approximately the > centre (although only the connection headers are > visible through holes in the bulkhead between the > distribution panel and the area which holds the > floppy and / or hard drives). The cable to be used > is a 40 pin cable with a female header at both ends > and usually about 10" in length (when used in a BA23). Actually it's a 34-way cable, just like the 34-way cable used for a PC 3.5" drive, though without the "twist" that most PC drive cables have. The RX50 uses an almost-standard SA400-style interface . -- Pete Peter Turnbull Network Manager University of York

21 years, 1 month

$2000 Black Apple (?) - scam ?

by dave04a＠dunfield.com

>Oh yeah, and one sold last week on ebay (no drives, not tested) for >$182... so IF the guy really has an untested unit he is able to sell for >$2000... he is one lucky SOB. I'll let ya know if he says the sale actually went through (I asked him to keep me posted). I corresponded with the guy a few times back and forth when he first contacted me, to help him figure out what he had... My "gut feel" is that he's not trying to scam, but he may be getting scammed - I sent him to one of the fraud sites to read up on scams involving buyers offering unrealistic prices. I personally take Ebay prices with a big grain of salt --- In looking for the Black Apple you mentioned, I noticed a "@@LOOK@@ ***RARE*** Original Macintosh 128" up to $250 ... (I bought a near-mint Mac (128) with a nice carry bag, external floppy drive and other goodies for $19 (Cdn) at a local goodwill shop a couple of months back). And I do have to add shipping ($50+ on something this big) plus taxes, duty, brokerage and currency conversion to anything I purchase from the states, so I felt $150 (base) and the aggrevation of getting it here was not worth it to me. But, I agree that someone who REALLY wanted it and/or didn't know better might pay a few hundred ... (especially if they are an Ebay type). It wasn't until it went over $500 and then $1000 that I really started to think that he might be getting scammed. Anyone have advice to pass on to him - anyone used agents/services to perform an overseas transaction more safely etc.? Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

21 years, 1 month

Emulating tapes/disk via linux/*bsd ?

by julesrichardsonuk＠yahoo.co.uk

Quick check to see if anyone's ever tried this. (where "tried" = "written some code to do so") In theory one could hook up a system running linux/*bsd with a SCSI controller present acting as a target rather than initiator, and have the machine pretend to be a tape drive, hard disk etc. I have no idea if the linux / *bsd kernels (or card drivers) support running as a target, or if the necessary hooks are present into user- land (eg. via 'sg') to allow user code to do the emulation, though. Just thought I'd ask if anyone's attempted to do it before... (personally I can write sg device code, but I'm by no means a kernel hacker) cheers J.

21 years, 1 month

RK05 Help

by rickb＠bensene.com

Hello, I have two RK05J drives, both exhibiting the same problem. They are *not* currently connected to a system. I have them on the bench cleaning them up and getting them ready to connect to a PDP 8/e system after a long period of storage. There is the I/O terminator card installed in the proper slot in the drive electronics backplane. When the drives are powered up, the "power" and "load" lights are on, and the door release is activated so that the door can be opened and a disk pack inserted. However, the blower motor that provides the air circulation for the drive never starts up. I've checked both blower motors to assure that they are not seized, and the both spin very freely. I traced the power wires from the blower motor to a barrier strip, where I checked for 110V AC power, and there's nothing there. So, somewhere in the circuitry, something isn't right. Any ideas? Thanks, Rick Bensene The Old Calculator Web Museum http://oldcalculatormuseum.com

21 years, 1 month

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test-drb March 2005