test-drb

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101090 discussions

by johannesthelen＠hotmail.com

Hello friends! I just got another donate to my collection... It contains several items, but the big one of this donate is HP3000 Series III! :D Do anyone know what it weights? This one have CPU with Option 200 rack (my best guess, like some expanded IO?). And is there wheels below racks? Ps. IBM 1800 project is going further bit by bit, all gate doors and flat cabling is assembled back where they were. More coming about this later! - Johannes ThelenFinland Before microcomputers blog (Finnish) http://ennenmikrotietokoneita.blogspot.fi/

11 years, 2 months

3.5 floppy imaging

by shumaker＠att.net

I'm looking for a tool to do a bunch of 3.5 floppy imaging using a linux or a windows box.... Media is all early PC stuff. Any thoughts, comments, tools of choice? Is IMD the format of choice for these as well or is there something else for the newer formats? Steve

11 years, 2 months

ID help, Ampex tape drive and other things.

by pontus＠Update.UU.SE

Hi I'm about to go on a small road trip to pick up some computer gear. I'm curious about what I'm actually getting :) http://www.update.uu.se/~pontus/slask/L%C3%B6fberg-haul/ I know what the Siemens and IBM things are, but: What system would the the Ampex Series 800B have been used with? The Alfaskop terminals, are they 3270 compatible? Regarding the huge stack of tapes, what should I look for in order to identify what might be on them, is the "9270" label any clue? I will leave the Esselte Scribona FD 20 behind, but I'm curious what it is? I think it may have served use on an airport, printing boarding passes or similar. Regards, Pontus.

11 years, 2 months

Weird stuff has a TI 810 (also if anyone has token ring wiring)

by jws＠jwsss.com

There is a white cased TI 810 at Weird Stuff in the AS IS room. Probably cheap. Of course unknown condition. Got some very nice Token ring equipment from an IBM facility of some sort. will be using for Hercules setups. I'll need some balun's for the RJ45 (ibm version) to the DB9 if anyone has an idea of the hookup. I'd like to figure out if I can wire this w/o using the token ring cables, since I have what appears to be a bridge unit. I'll have to research that though. Thanks Jim

11 years, 2 months

PDP-11/74 MP

by jnc＠mercury.lcs.mit.edu

> From: John Wilson > Even if E11's mP feature is officially unsupported, it was a *crazy* > amount of work What made it so much work? (Just curious about the technical aspects...) Noel

11 years, 2 months

HP board id?

by marc.verdiell＠gmail.com

Thanks another million. - Marc >> Is the "HP 1000 M/E/F-Series Computers I/O Interfacing Guide" >> (02109-90006 September 1980) available online somewhere? >I thought I had sent it to Al some years ago, but it's not listed. In any >case, I've posted it here: > http://home.earthlink.net/~jdbryan/dropbox/02109-90006_Sep-1980.7z > See chapter 5, pages 5-5 and 5-6. > -- Dave

11 years, 2 months

FYI - Plato Terminal has been sold

by curt＠atarimuseum.com

Thank you for all of the inquires... The CDC 721 Plato Terminal has been sold. Curt

11 years, 2 months

R: Re: 3.5 floppy imaging

by supervinx＠libero.it

The only reason I guess is that they're bootable disks. Otherwise a simple filecopy is more than enough :) -------- Messaggio originale -------- Da: Fred Cisin <cisin at xenosoft.com> Data:17/05/2015 16:40 (GMT+01:00) A: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Oggetto: Re: 3.5 floppy imaging > If they are just plain old dos format (DD or HD) dd under linux will do IF they are just plain old DOS format (DD or HD), then COPY will do. IF they are just plain old DOS format (DD or HD), then there is no reason to "image"! IF they are just plain old DOS format (DD or HD), then the files are all that matters. IF they are NOT just plain old DOS format (DD or HD), THEN there might be reason to image, such as if they are some unknown and not understood format, and the files can not be extracted, or there is reason to believe that there is some form of information in the structure and format of the disk that should be preserved, such as system tracks on CP/M disks, etc. Or, if they are copy-protected, and stuff other than the files needs to be preserved to be able to use the files.? 'Course then, your "imaging" methods are not likely to work, anyway. But, IF they are just plain old DOS format (DD or HD), then there is NO information other than the file content on the disks. If you format a 3.5" disk in a DOS/Windoze machine, and copy some file onto it, . . . Could you please explain to me WHY you would want an "image" of that disk?

11 years, 2 months

PDP-12 Restoration at the RICM

by michael.99.thompson＠gmail.com

Dan (the donor) brought more manuals, diags on paper tape, and his very nice color oscilloscope. Dan's 'scope displays RMS, PTP, Average, and other voltage values on the side of the trace window, so it makes power measurements very easy. After reading the manual and getting instructions from Warren, we found that some of the misbehaving front panel was due to operator (me) error. The Mode switch to change between LINC and 8 operation only has an effect after you press the I/O Preset switch, so that is working correctly. When you press I/O Preset the INST FIELD is set to 1 and the DATA FIELD is set to 3. I though that this was wrong for an 8k machine. If you look at the front panel you will see three bits and an additional 2 bits for the INST FIELD and DATA FIELD. So part of this is for the 8 and all of it is for the LINC, and it is working correctly. We recabled the VR14 and TU56. The Local Forward and Reverse switches on the TU56 do not get the correct behavior from the motors. The Line fuse on the VR14 blew when we turned it on. We will replace the fuse and try a slow power up with a Variac. We received lots of comments on reforming the capacitors in the power supply and strong recommendations from experts to just replace them. Since new caps are a different physical size, and would cost about $250 we decided to continue with reforming the originals. We measured the voltage ripple on the backplanes near the power connectors. - +5.0V = 5.01V, 200 mV PTP ripple - +10.0V = 5.9V, 200 mV PTP ripple - -15.0V = -14.2V, 800 mV PTP ripple - -30.0V = -31.2V, 800 mV PTP ripple The 800mV of ripple on the -30 is a sign that the caps in the power supply were not working well, and is probably too noisy for the core to work. We tried to measure the capacitance of the power supply capacitors using an ancient, but very nice, GenRad capacitor meter, but unfortunately the caps were too big to measure. We thought that more power on time for the caps might improve their behavior, so we started debugging the processor. We found that bits 4 and 11 in the Program Counter were always on. We looked at the flip-flops on the M221 modules in the processor that make up the PC register and they the contents matched what was loaded from the console switches. We need to determine why the indicator lights on the front panel do not exactly reflect the internal state of the registers in the processor so we can continue debugging. After running the system for about four hours the ripple on the -30V was down to 180mV, so the capacitors are getting better. More run time will hopefully reduce the ripple to an acceptable level. If not, we will have to replace them. -- Michael Thompson

11 years, 2 months

Weird stuff has a TI 810 (also if anyone has token ring wiring)

by COURYHOUSE＠aol.com

one here but not cheap. I was happy I got a diablo KSR I can not even tell you how bad I used to lust after one of those in 1979...... http://www.omnidatasys.net/catalog/printers/texas-Instruments-ti-820-ksr In a message dated 5/17/2015 12:19:45 P.M. US Mountain Standard Time, jwest at classiccmp.org writes: I am looking for a TI 820 or 825 KSR, if anyone has one in good shape with all keys that they are willing to part with - sale or trade... J

11 years, 2 months

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