test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: Ethan Dicks > I only ever saw one other RK05F in the wild, FWIW. I only ever saw one, also. > On Tue, Oct 13, 2015 at 4:07 PM, Henk Gooijen wrote: >> I remember (just) one RK11-C passing by on eBay .. at least 8 years >> ago. It sold for ~ $50 (IIRC). > That's an amazing price just for the pile of FLIPCHIPs. Hey, back in the late 60's, you could buy an outdated Ferrari racing car, or a retired Cobra Daytona, for a couple of thousand, US$. Those cars now sell for tens of millions... >> Will never forget that I let that one go! :-( The people who passed on those Ferraris, Daytonas, etc now have the same reaction! I wonder if PDP-11's will ever get anything like that stupid? Probably not (although one never knows, q.v. the Ferraris and Daytonas); although I reckon they will be more noteworthy to later collectors (i.e. who didn't use them themselves) than most other old machines, because the PDP-11 was the machine that really set Unix on the road. (Which is not why _I'm_ big on them, mind...) Noel

10 years, 6 months

Anyone have manuals for these peripherals?

by COURYHOUSE＠aol.com

will add it to my list as I go though arrivals here Carl. thx--- Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 10/13/2015 2:42:55 P.M. US Mountain Standard Time, Carl.Claunch at gartner.com writes: I have a Perkin Elmer VT2222 disk drive (Vanguard I) which due to the acquisitions of the time, was Interdata and became Wangco and Cipher. Looking for a manual especially schematics. I have an IBM 9347 (9 track tape drive) which uses IPI-3 for its interface. If I can get schematics for the drive (or for the controller board that goes in a 9370 system, I can get work up a replacement interface. Looking for the manuals for drive or controller. Thanks, Carl ________________________________ This e-mail message, including any attachments, is for the sole use of the person to whom it has been sent, and may contain information that is confidential or legally protected. If you are not the intended recipient or have received this message in error, you are not authorized to copy, distribute, or otherwise use this message or its attachments. Please notify the sender immediately by return e-mail and permanently delete this message and any attachments. Gartner makes no warranty that this e-mail is error or virus free.

10 years, 6 months

new acquisition

by jwest＠classiccmp.org

Yep, I was the one that scored that SYM-1 and accessories for $40 :) Pictures at https://www.flickr.com/photos/131070638 at N02 Just arrived, have yet to power it up as I'm busy with DG projects (next email!) :) J

10 years, 6 months

H960 logo panel

by jnc＠mercury.lcs.mit.edu

> From: Henk Gooijen > yes, please take a nice picture of it! ... The higher the resolution > the better! OK, I scanned it (I prefer scanning to pictures, as there is almost inevitably distortion when using a lens), at 300 dpi. The whole thing wouldn't fit in my A3 scanner, but I got the majority of it, and the part that's not shown is just the plain two-colour band. Available here: http://ana-3.lcs.mit.edu/~jnc/tech/jpg/CanadaPanel.jpg and I've also added it to my 'PDP-11 resources page', here: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/PDP-11_Stuff.html Also, I have recently scanned in the front indictor panel for the 11/55 and 11/70 (the later one, with the blue/blue colour scheme), and those can be found on that page too, along with drawings of the basic 40-45-70 panel (only the on/off switch, etc, locations differ) and the basic 45-50-55 panel (with on/off switch and selector switch holes added); those have also been added to that page. I'd like to encourage people with other front panels (I myself am particularly interested in those for the 11/45, RF11, RK11-C and RP11-C) to scan them too, for people who are interested in doing reproductions. I can host the images, for people who don't have that capability. Noel

10 years, 6 months

Anyone have manuals for these peripherals?

by Carl.Claunch＠gartner.com

I have a Perkin Elmer VT2222 disk drive (Vanguard I) which due to the acquisitions of the time, was Interdata and became Wangco and Cipher. Looking for a manual especially schematics. I have an IBM 9347 (9 track tape drive) which uses IPI-3 for its interface. If I can get schematics for the drive (or for the controller board that goes in a 9370 system, I can get work up a replacement interface. Looking for the manuals for drive or controller. Thanks, Carl ________________________________ This e-mail message, including any attachments, is for the sole use of the person to whom it has been sent, and may contain information that is confidential or legally protected. If you are not the intended recipient or have received this message in error, you are not authorized to copy, distribute, or otherwise use this message or its attachments. Please notify the sender immediately by return e-mail and permanently delete this message and any attachments. Gartner makes no warranty that this e-mail is error or virus free.

10 years, 6 months

TV Typewriter Cover Unit location?

by unclefalter＠yahoo.ca

Hey there, I'm currently working on a replica of Don Lancaster's prototype TV Typewriter (pic here: http://s1381.photobucket.com/user/unclefalter/media/20151011_125748_zpssu7yy ujf.jpg.html?o=0 ) and I was wondering - does anyone know where the unit that appeared on the cover (with the more refined keyboard) ended up? I've asked around, including Don and nobody seems to know where it got to. I'm also wondering if anyone knows a source that might have the keytops that unit used or something close (I understand they were made by Mechanical Enterprises). I've enough parts here to build two or three TVTs and I thought after I get the prototype replica done I might go for the cover unit, esp. if it no longer exists anymore. But I understand those keytops were kind of a one off deal for that article. Thanks!! Brad

10 years, 6 months

PDP-12 Restoration at the RICM

by michael.99.thompson＠gmail.com

We did a lot more debugging on the TC12 LINCtape controller. We saw a 500ns glitch in the LMU MOTION signal that corresponded to a short slowdown in tape speed. We will investigate this next week. We entered the LINC instruction to check a single block (0707) in the left switches and a block number (0777-0000) in the right switches. When we pressed the DO key it should go to that block on the LINCtape. With large block numbers (07xx) and with the tape positioned half way through the tape it worked OK. With lower block numbers it sometimes could not find the block and searched back-and-forth on the tape. The logic analyzer showed that the block numbers were correct in a sequence of several blocks, and then it will read a bad block number. The TC12 would tell the TU55 to turn around, it would read a good block number, realize that it was going the wrong direction, and turn the tape around. It would then read a good block number, and then a bad block number, and turn around. At this point we don't think that we are working with bad tapes, but the problem might be in either the TU56 tape drive, or the TC12 LINCtape controller. We see bad behavior in both devices so we will do as Charles Lasner suggested and swap a TU55 and TU56 between the PDP-12 and the PDP-8/I. This will let us test the TU56 with a known good TC01 LINCtape controller, and test a known good TU55 with a questionable TC12 LINCtape controller. We ran the A-to-D converter test and were rewarded with a display on the VR14 that showed correct operation of the knobs and A-to-D converters. -- Michael Thompson

10 years, 6 months

Tektronix Hard Copy Unit (Was: Phototypesetters and imagesetters - Re: VT52s, VT61s lots of DEC and DG keyboards)

by rickb＠bensene.com

> > > >> On Oct 13, 2015, at 11:52 AM, tony duell <ard at p850ug1.demon.co.uk> > wrote: > >> > >>> The only other terminal I worked > >>> with that could do that was a Tektronix storage scope terminal (4010 > >>> or 4014, IIRC). The Tek printer wasn't built-in, but it did take a > >>> scan of the live screen, so that was similar. The paper was > >>> silver-grey and I remember it coming out wet too. Everything else I > >>> worked with was either thermal or dot-matrix impact, and could only > >>> capture text as it arrived at the terminal, not a screen image. > >> AFAIK, the Tektronix external "hard copy units" for their DVST display terminals (4002A, 4010, 4012, 4014, and others that were integrated into various systems (e.g., the 4081 computer system, and 4051/4052/4054 desktop computers)) were dry-process devices. The paper was a dry-silver paper that was photosensitive, but it was developed by heat rather than by chemicals. It is possible, in the very early days of the DVST terminals, that some kind of wet-process hard copy may have been used...or that perhaps a third party developed a wet-process hard copy unit, but my only experience was with the thermal-developing dry-silver paper hard copy units. I used these devices extensively in my time at Tektronix, and became quite expert at troubleshooting/adjustment of the hard copy units. There were no chemicals or toners involved. The paper would come out of the machine quite warm from the developing process. The tube in these hard copy devices was indeed weird...wide, but not very tall. It produced a single scan line that was synchronized with the motion of the paper through the machine. The scan line was driven by the terminal, which used a low-intensity scanning beam to "read" the charge on the storage element of the display screen, and sent the analog signal from the read-out image to the hard copy unit. The DVST technology that Tektronix created for these terminals was very much an example of the extreme levels of CRT technology and knowledge that existed within Tektronix during those days. Just about every tube they used for oscilloscopes, scan converters, and all of the DVST tubes were designed and manufactured in-house at TektroniX HQ in Beaverton, Oregon. The CRT building was one of the earlier buildings on the Tektronix campus there. It was quite a place to visit. Even in the late 1970's, there was amazing CRT development going on there for building things like the tube for the first 1GHz (analog) oscilloscope. Rick Bensene The Old Calculator Museum http://oldcalculatormuseum.com

10 years, 6 months

Punch solenoid coil problem on old Flexowriter

by go＠aerodesic.com

I'm in the process of refurbishing an old model SPD Flexowriter (from the 1950s.) When I placed it in storage, all worked ok. The storage room was dry (though not heated or cooled) and there were no mice or other vermin involved in it's repose. However, upon starting it back up (and lubing every moving part beforehand) I discovered the punch wasn't firing "on all cylinders." After disassembling the punch solenoid block, I discovered two of the coils were now open (corresponding to the two missing positions) but also, two coils had apparently shorted somewhere and changed value. From a nominal 850 ohms, the two were now about 150 and 500 ohms. I have a lot of old gear with relays (similar to these driver coils) and I've *never* had a problem with an open relay coil (that wasn't caused by obvious damage.) Is this a problem any of you have experienced and if so, have you ever discovered the root cause? I presume it is some corrosion, but the open coils were open near the middle of the winding (#41 AWG wire with about 11000 turns.) The breaks were NOT at the junction of the #41 and the sturdier wire that connects to the terminal block. Also, question 2: the Flexowriter parts list shows two different coils (both 850 ohms) used in this assembly. Four of one and four of another. I'm presuming these are magnetically polarized so that half are North-up and half are North-down in order to not have truly strange things happen all 8 are firing and you get so much magnetism that some armatures are repulsed rather than pulled, but I don't find that mentioned in the manual. I'm planning an experiment with a hall-effect sensor to verify. So far my failures have all been one type so I don't have any to visually examine while I'm unwinding them. The Flexo parts differ only in their part number - no other visible differences are seen. I am rebuilding the coils as I have an ample supply of #41 but I want to know if I need this 'normal/reverse' polarity thing if it exists. So far, I've rewound one coil with a match in wire direction to the one it replaced and it seems to be ok. TIA, Gary

10 years, 6 months

Calcomp 1039 plotter docs?

by simski＠dds.nl

Hi All, we have a 1039 in our space with the user guide, but without any service docs. Our specimen does not react to buttons except the reset and test buttons. the four statusleds light up on a reset and after a second the center two leds start blinking in sequence. paper and pens are loaded as per the user guide. anyone with documentation on this thing? -- Met vriendelijke Groet, Simon Claessen drukknop.nl

10 years, 6 months

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