test-drb February 2003

test-drb@ccmp.vtda.org

337 participants
780 discussions

by doug_jackson＠citadel.com.au

>> Wasn't that chip used in the Tandy TRS-80 Model 100 machines. >I thought the M100 uses the 14412 chip... Yep, You are right. >> >> I remember playing with the Band Pass filters to convince the >>TRS-80 to work >> with CCITT tones, instaed of the Bell tones that were used in >>USA. That was a while ago >IIRC, the 14412 didn't demodulate CCITT tones reliably at 300 baud. The >better-designed UK modems that used this chip at all used it for the >modulator only and used something like an XR2211 for the demodulator. Ahh, That explains why it was allways fussy about signal levels. The data sheet said that it could do it, and I had to alter the level of the BELL/CCITT pin. - doug CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster(a)citadel.com.au. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of Citadel Securix. Feel free to visit the Citadel Securix website! Click below. http://www.citadel.com.au

21 years, 10 months

PDP-11/04 on Ebay - whats wrong with it?

by fm.arnold＠gmx.net

cctech-request(a)classiccmp.org schrieb am 25.02.2003: >Subject: PDP-11/04 on Ebay - whats wrong with it? >Date: Tue, 25 Feb 2003 13:27:37 +1100 >From: "Kane, David (DPRS)" <David.Kane(a)aph.gov.au> > >Hi, > > >A PDP-11/04 on ebay >http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1247&item=3403225 >748&rd=1 > >I have to start by stating I am in Australia. Our dollar might have >crept back up to a smidgen over 60 cents US today, but the opening bid >on the PDP will still be considerable, then add international shipping >and ooooooh ouch. But despite all that I am still toying with the idea >of bidding on the item. I do need a little assistance before making a >definitive decision. For those unaware the item was listed before >recently but was passed in unbid. I did not get interested last time >since the description did not list a CPU card, and the seller did not >reply to an enquiry regarding a CPU card. I notice that this time there >is a CPU card listed (M7263). My quandary is over the seller's comment >that the "Unit powers up and reads 0002777" although the pictures have >it reading 000277. My worry is that the unit is severely broken. Can any >take a stab at guessing what might be wrong, is it possibly just the >lack of a boot device (floppy of hard disk)? > > The lack of boot devices is certainly one reason, but I dont see any memory in that machine either. The seller advertises a Plessey PM1116, a 16 kw module, but it's not in the machine. If you compare the photos, you will see different board-configurations, so they are actively playing with what to take out and what to leave in.... :-(( This is a very bad sign in my eyes, as they say that they cannot test. If thats true, why do they swap the modules around ? Also the far-end unibus-terminator is missing, pointing to a canibalised backplane and/or expansionbox. Will you be able to find that terminator? Without that the machine will never run. Anyway aske a detailed list of all the included modules from the seller. Further this machine will weight some 50 - 60 kg. At the same weight and thus shipping cost you can get an 11/34. Thatone will be a lot more fun, as it will allow you a bigger selection of os's. The 11/04 is limited to 28 (31 with a trick) kwords of memory, has no memory management and will therefore never run the bigger PDP11 SW-packages. If I were to decide, I would leave thisone where it is now, too uncertain at the probably huge cost of shipping. You better stick to a system that hasn't been altered after its decommisioning. Its always better if you can talk to the people that were previousley using the maschine you get, although this happens seldom. Finalley, look at the selles feedback, (which is realley good) he's selling just about anything from anywhere. Don't expect any expertise on the item sold. Frank

21 years, 10 months

TU58 Emulation (was: M9312 Bootstrap Questions)

by fm.arnold＠gmx.net

cctech-request(a)classiccmp.org schrieb am 25.02.2003: >From: "Robert F. Schaefer" <rschaefe(a)gcfn.org> >Subject: Re: TU58 Emulation (was: M9312 Bootstrap Questions) >Date: Mon, 24 Feb 2003 21:02:56 -0500 > >> Frank Arnold wrote: >> > I hope you can boot anything else, do you have a DL11-W? You could use >> > this with a PeeCee emulated TU58 for diagnostics ect. >> >> Two questions. >> >>First, has anyone here emulated a TU58 successfully in software? I searched >>through the archives and found lots of posts that say "you could" and none >>that say "I did". If it's doable, what software should I use? There is a true SW-emulation at: http://www.not-compatible.org/PDP-11/programs/tu58sim.html Someone else has done another simulator as well, but don't remember it now >You might want to take a look at >http://www.sparetimegizmos.com/Hardware/TU58_Emulator.htm. Thats a nice HW-emulation, is much faster as the real tape... Frank

21 years, 10 months

Info wanted: IBM vacuum tube digital computer demonstrator

by rigdonj＠cfl.rr.com

Max, Great! Thanks! Joe At 12:56 PM 2/25/03 +0100, you wrote: >On Mon, 24 Feb 2003, Joe wrote: > >>Yes, that's the item but I'm pretty certain that he's wrong about it being >a >> field engineer's test set. A couple of list members have tracked down >several >> of these but no docs yet. > >Hi > >The diagrams of the plugglable units should be available at: >http://www.piercefuller.com/collect/ibmpu/ > >Max

21 years, 10 months

Help with my PDP 11/73

by chu＠verizon.net

I have gotten my PDP 11/73 to start up and go through an initialization script for RSX-11Mplus. However, I do not know any uids/passwords, so I cannot login; I can only watch the script go by. I am able, while the script is running, to break into MCR and run commands like PDP and DMP. I am able to dump in octal some of the files like [0,0]001054.DIR;1. Does anyone know where the user names/passwords are stored? My memory says that the maybe they are not encrypted? Is that so? TIA, DAve Chu

21 years, 10 months

DHV11 on BSD2.9

by chpap＠ics.forth.gr

I have read in a message by Steve Schultz that there are 2.9BSD drivers for the DHV11-A around. Can I still find them?

21 years, 10 months

KNOCK IT OFF people

by jwest＠kwcorp.com

Yes, cctalk is not the totally off-topic free zone that cctech is. However, do NOT interpret that as a "anything goes" policy. I've sat back and watched the past few days of crap threads and I'm a little tired of it. More importantly, I've received numerous complaints. OFF topic posts on cctalk ARE ok. But I think we're all adult enough to know what is pushing the envelope. Sure, go off topic, that's what this list is for. But extended threads on religion, politics, etc. that are little more than pi**ing contests are just off-base. Thanks Jay West

21 years, 10 months

Help ID this board...

by cb＠mythtech.net

> There is only one sticker on the card >that says "1990 LTI; All Rights Reserved; I believe LTI is Lapis Technologies. They made video cards for the Mac. I would guess it is probably a video card of some kind. Many of the older full page display cards had 9 pin connectors. I don't know if they used a standard video output or if they had to go to the monitor they were meant for. >Since the board is blue, I figured that its >probably a prototype of something, maybe a video card? Probably just artistic license on coloring the board. I have seen blue video cards before in the Mac. -chris <http://www.mythtech.net>

21 years, 10 months

Identifying a Motorola chip - MC14544?( OT)(actually grass ai rports)

by mmcfadden＠cmh.edu

> Ethan wrote > >> Any help would be greatly appreciated; Particularly since the people > that > >> own the property have sold off the end of the strip to a local farmer > who > >> keeps cows there... And the other pilots are a bit too soft to leap the > >> fence and wander through a herd of cattle in the middle of the night > just > >> to turn on the lamps... > > > >I've been to a strip in NW Ohio, Fremont, that has a grass strip butting > >into a narrow asphalt strip in a Tee shape... the State airport guide > >warns that cows may be present on the grass runway and to perform a > >flyover before attempting a landing there. > > I live across the street for an inactive grass field, main problem for > pilots was deer > and dogs on the runway. We could never fly kites or launch Estes rockets > this close to an airport. > I once had my dinner interrupted by a pilot who crashed and walked up to > the house and asked to > use the telephone. His Globe Swift's alternator had failed. He couldn't > manually crank down the > landing gear and wanted to land on grass to save the plane. Now we have a > sixty acre park, we > still mow the runway, great for walking dogs and exercise, no cars > allowed. Occasional wood chucks, > deer, turkeys, and foxes however. > > Mike

21 years, 10 months

3 BC26V-12 cables available

by stuart＠stuartsjohnsonfamily.net

I recently received a bunch of stuff, including 3 each BC26V-12 SI disk cables, frequently used with RA60, RA80, etc. disk drives. I have no use for them, so if anyone wants them, they are available for the shipping expense. Contact me off list if you are interested, tell me how many (1-3) you want. These cables came from my previous employer and were removed some years ago >from working equipment (that I decommissioned when I worked there) and should be fully usable. First come first served. Regards, Stuart Johnson ssj152 AT charter DOT net // should be obvious how to fix email address

21 years, 10 months

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test-drb February 2003