- test-drb@ccmp.vtda.org - classiccmp.org

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 Hey, back in the late 60's, you could buy an outdated Ferrari racing car, or a retired Cobra Daytona, for a couple of thousand, US$.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, 8 months

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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, 8 months

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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, 8 months

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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, 8 months

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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, 8 months

1
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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, 8 months

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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, 8 months

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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, 8 months

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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, 8 months

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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, 8 months

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H960 logo panel

by jnc＠mercury.lcs.mit.edu

> From: Rod Smallwood > I could use the H960 its attached to!!! Cold, dead, hands, etc, etc! :-) But to be serious, those things are in really hot demand - I know Paul A wants some more, I'd like a couple more, etc, etc. They aren't _that_ complicated - it shouldn't be impossible to get more built? Does anyone have any expertise in this area, to let us know how/where to start? Noel

10 years, 8 months

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Source for 3M Bumpons

by cctalk＠fahimi.net

Hello all, I am trying to replace some rubber feet on a couple of items and it appears the OEM used 3M Bumpons. I've been trying to find a source that will sell small quantities but all I can find is one box minimum (which is a couple of thousand!). I am willing to buy as much as a whole sheet but prefer less if possible. Looking for models: SJ5780 and SJ5023 both in Grey (not black). The SJ5023 is available on eBay but not the round SJ5780s (in Grey). Any help is appreciated. TIA! -Ali

10 years, 8 months

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Computers in Election Vigils - take two

by linimon＠lonesome.com

On Mon, Oct 12, 2015 at 03:51:14PM -0300, Jecel Assumpcao Jr. wrote: > There are a lot of people who would like to buy people's votes It's a good thing this does not happen in any other countries <cough>. :-) mcl

10 years, 8 months

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Comstar Process Control Compiler

by christian_liendo＠yahoo.com

I'm looking for any info on the Comstar Process Control Compiler. The only thing I could find of any real value was this PDF. http://www.computer.org/csdl/proceedings/afips/1975/5083/00/50830033.pdf I would like to try and get this working again.

10 years, 8 months

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ISO: Manual for Fujitsu M2372K SMD drive

by derschjo＠gmail.com

Subject line covers it; the M2372K manual isn't on Bitsavers (the 2382K is, but it's significantly different) and all I've found is this covering the basics, and I'm not 100% sure it's correct: http://stason.org/TULARC/pc/hard-drives-hdd/fujitsu/M2372K-824MB-8-0-FH-HSM… Anyone have this manual? Can you confirm that the settings listed on stason.org are valid? I'm trying to get this drive to format using an Emulex UD33 (UNIBUS SMD) controller, and I'm not having much luck. (I'm also not certain that the 2372K isn't too new for the controller; another place a manual would be of immense help.) Thanks, Josh

10 years, 8 months

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Old Tekky manual FTGH

by COURYHOUSE＠aol.com

Hi Mouse - Yes we know that 545 scope and have one in storage to be refurbished If you can get it to we guarantee it will be loved and perch in the display with the display of the scope. Many Thanks in advance - Ed Sharpe archivist for SMECC _www.smecc.org_ (http://www.smecc.org/) In a message dated 10/12/2015 2:10:55 P.M. US Mountain Standard Time, mouse at Rodents-Montreal.ORG writes: I have a Tektronix "OPERATORS' MANUAL" for "CATHODE-RAY OSCILLOSCOPES TYPE 535 AND 545" (those are quotes from the front cover) which says it "applies to standard Type 535 Oscilloscopes having serial numbers between 6045 and 7552, to rack-mounted Type 535 Oscilloscopes having serial numbers 4048 and 4072, to standard Type 545 Oscilloscopes having serial numbers between 5946 and 7400, and to rack-mounted Type 545 Oscilloscopes having serial numbers between 1740 and 1775". (I suspect there is a "between" missing before "4048".) It is a small 45-page booklet and is definitely a user's manual; it is not a repair document, not even what tony calls a boardswapper guide. It apparently got wet at some point in its history; the first and last few pages are stained green, presumably from the covers (which are green). (Not stained to the point of illegibility.) I do not have any device it applies to, do not really expect to, and am inclined to doubt I would need it even if I did, so I would cheerfully pass it along to someone who actually wants it. It's currently in Ottawa (Ontario, Canada); I could pop it in the post easily enough. Anyone? /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

10 years, 8 months

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TV Typewriter Cover Unit location?

by COURYHOUSE＠aol.com

unique keys? I am not sure of that Unless he lettered in CTL looked like weird Mohawk data sciences keys or something.... I have seen this type of keyboard before... or some other place in a scrap environment post 1799..... Ed Sharpe archivist for SMECC In a message dated 10/12/2015 10:01:15 P.M. US Mountain Standard Tim, unclefalter at yahoo.ca writes: 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, 8 months

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0
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Old Tekky manual FTGH

by mouse＠Rodents-Montreal.ORG

I have a Tektronix "OPERATORS' MANUAL" for "CATHODE-RAY OSCILLOSCOPES TYPE 535 AND 545" (those are quotes from the front cover) which says it "applies to standard Type 535 Oscilloscopes having serial numbers between 6045 and 7552, to rack-mounted Type 535 Oscilloscopes having serial numbers 4048 and 4072, to standard Type 545 Oscilloscopes having serial numbers between 5946 and 7400, and to rack-mounted Type 545 Oscilloscopes having serial numbers between 1740 and 1775". (I suspect there is a "between" missing before "4048".) It is a small 45-page booklet and is definitely a user's manual; it is not a repair document, not even what tony calls a boardswapper guide. It apparently got wet at some point in its history; the first and last few pages are stained green, presumably from the covers (which are green). (Not stained to the point of illegibility.) I do not have any device it applies to, do not really expect to, and am inclined to doubt I would need it even if I did, so I would cheerfully pass it along to someone who actually wants it. It's currently in Ottawa (Ontario, Canada); I could pop it in the post easily enough. Anyone? /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

10 years, 8 months

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Computers in Election Vigils - take two

by toby＠telegraphics.com.au

On 2015-10-12 2:51 PM, Jecel Assumpcao Jr. wrote: > Paul Koning wrote on Sat, 10 Oct 2015 11:44:58 -0400: >>> On Oct 9, 2015, at 5:39 PM, Jecel Assumpcao Jr. wrote: >>> [noticed voter ID terminal had cable to voting machines!] >> >> That's not the real problem. > > Indeed, not *the* problem but just *a* problem I noticed while still in > line to get into the voting station. > >> The real problem is that you had no way to be sure, no way to verify, >> that the machine was recording your vote and would accurately report >> it later. It might just as easily report numbers that someone had told >> it to report, not connected to any reality. How would you know? If >> anyone were to question this, how would you prove that the count is >> honest? > > This issue was raised, so the third time these machines were used in a > national election there was a pilot with modified machines that printed > their results so that the voter could see (but not touch) and then > dropped the paper version into an urn. Observers from all the different > parties could use the paper trail to verify the numbers presented > electronically by the machines. After that single trial, TSE declared > that the result was that a paper trail was proved to be unnecessary and > caused delays and added expense, so those machines were never seen again > and elections in Brazil have been paper free ever since. Leaving the vulnerability. > > There are several aspects of voting culture in Brazil that are quite > different ... > > -- Jecel > >

10 years, 8 months

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Computers in Election Vigils - take two

by paulkoning＠comcast.net

> On Oct 12, 2015, at 2:51 PM, Jecel Assumpcao Jr. <jecel at merlintec.com> wrote: > > Paul Koning wrote on Sat, 10 Oct 2015 11:44:58 -0400: > ... >> The real problem is that you had no way to be sure, no way to verify, >> that the machine was recording your vote and would accurately report >> it later. It might just as easily report numbers that someone had told >> it to report, not connected to any reality. How would you know? If >> anyone were to question this, how would you prove that the count is >> honest? > > This issue was raised, so the third time these machines were used in a > national election there was a pilot with modified machines that printed > their results so that the voter could see (but not touch) and then > dropped the paper version into an urn. Observers from all the different > parties could use the paper trail to verify the numbers presented > electronically by the machines. After that single trial, TSE declared > that the result was that a paper trail was proved to be unnecessary and > caused delays and added expense, so those machines were never seen again > and elections in Brazil have been paper free ever since. Cute. So that demonstrates that the results of that one election are accurate, but it tells you nothing about the later ones. And the claim that the paper is "unnecessary" shows either ignorance, or dishonest intent, on the part of the person making that claim. After all, you have no way to know whether the later machines are still honest, just because the ones used in that one election were. paul

10 years, 8 months

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PDP-12 Restoration at the RICM

by michael.99.thompson＠gmail.com

> > Date: Sun, 11 Oct 2015 18:44:54 -0500 > From: Jay Jaeger <cube1 at charter.net> > Subject: Re: PDP-12 Restoration at the RICM > > Don't forget about the other more remote possibilities: cables, > backplane, bad wrap, supply voltages at the actual card(s) for the > mis-behaving channel, etc. > > JRJ > We used different control and data cables for the TU55 and the TU56 drives and observed the same track 3 bad behavior. The backplane appears to be in good shape. My scope had a little trouble looking at 10-15mV signals in differential mode using the math functions, but we looked at the head signals going into the track 3 amplifier, and they looked reasonable. The power supply voltages at the cards are within spec. The track amplifiers are supposed to be differential, so they should be fairly immune to power supply noise. We plan to connect a lab supply to the backplane near the track cards and adjust it slightly higher than the PDP-12 power supply. That should clean up any 60Hz noise on the power. Maybe that will help? We have swapped everything else between the tracks, including the logic analyzer probe, and the issue always stays with track 3. Maybe it is a backplane wiring problem? -- Michael Thompson

10 years, 8 months

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Computers in Election Vigils - take two

by paulkoning＠comcast.net

> On Oct 9, 2015, at 5:39 PM, Jecel Assumpcao Jr. <jecel at merlintec.com> wrote: > > John Robertson asked: >>> After the fiasco about the Deibold machines changing votes during the >>> Bush election of 2000, Brazil opted for them? > > To which Alexandre Souza replied: >> Yep. Welcome to the land of the stupid. > > Ok, I think we need some facts, here. Note that from the very first time > I used one of these machines to vote and noted that they typed in my > voter ID number using a little keyboard which had a cable going into the > voting "cabin" to prep the machine for my vote, my opinion of the whole > thing has be very negative. After all, I had only their word that they > were not saving my ID along with my vote - there was no hardware > limitation against it doing this. That's not the real problem. The real problem is that you had no way to be sure, no way to verify, that the machine was recording your vote and would accurately report it later. It might just as easily report numbers that someone had told it to report, not connected to any reality. How would you know? If anyone were to question this, how would you prove that the count is honest? paul

10 years, 8 months

3
2
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H960 logo panel

by jnc＠mercury.lcs.mit.edu

So, I recently acquired a machine which has an unusual "digital equipment of canada, ltd." pdp11 logo panel at the top of the H960 it's in. Is there anyone who would really have a connection to a panel with that on it? (Let me hasten to add that I have nothing _against_ it, and would be happy to leave it there, but maybe someone out there is dying to have one.) If so, I'd be more than happy to swap this one for a plain pdp11 logo panel (i.e. one that says "digital equipment corporation"). Also, if anyone wants a scan of this, let me know, and I'll crank one out. Noel

10 years, 8 months

3
3
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Xebec 1402A Seagate HDD controller

by dmonnens＠gmail.com

Was curious if anyone here has - or knows someone who does - a Xebec 1402A Seagate HDD controller. The drive is in an IBM 5150. Note that this MUST be the 1402A, NOT the more common 1402. There is some important historical data we are trying to recover, but the controller is nonfunctioning. Thank you for any help! -- Devin Monnens www.deserthat.com The sleep of Reason produces monsters.

10 years, 8 months

5
8
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Q-bus I/O project

by dab＠froghouse.org

Wow. A pretty board indeed. Thanks for showing it off. This is also interesting to me since a friend and I have been talking about building something rather similar (and entirely different at the same time, we're just focusing on the mass storage function and using an FPGA). I'm curious about some things though, if you'd be willing. Bus drivers (along with voltage level conversion) have been a problem. You seem to be using 74LVC parts. Are they close enough? Though I also see a bunch of FETs down there. I've used OSHPark in the past for small boards but for 45 sq.in. boards they'd seem to be awfully expensive, even if using their medium run pricing. The fingers look gold plated. It could be just the ENIG finish but I also see little tails running off the bottom as if you're setup for hard gold plating. Does OSHPark have that capability? I gotta say that I'm impressed with your soldering skill as well as stamina. I was going to ask if it was machine assembled but I see in a later message that it wasn't. I was hoping for the Pick 'n' Paste machine to come along and save me from having to do all that by hand but that project seems to have faded away. I'm curious why you didn't use resistor networks instead of discrete components. I also love that your design tool put omegas on the silk screen for the resistor values. -Dave

10 years, 8 months

5
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DEC H7140 (11/44) power supply revisions and general advice?

by jnc＠mercury.lcs.mit.edu

> From: Mattis Lind > Very nice and clear description on what is required to have relay to > activate! Indeed! Thanks, Brent, for that wonderful writeup - I'm sure I'll find it immensely useful when the time comes to work on my 11/44. I'll have to carefully save a personal copy in a file - finding it in the archives, when the time comes, won't be too easy. If only we had a Wiki we could put all this kind of stuff in... (Hint, hint!) Noel

10 years, 8 months

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Panda Panel

by tmfdmike＠gmail.com

(BCC to Spare Time Gizmos and Rich A. - both of whom may have a clue!) Folks, I've finally dug out my Panda Panel and got it going - after having to deal with various strangeness in a dodgy parallel port connector, and figuring out I really DID have to be root to get it to initialize! It all works; the 'aux' CPU load segments respond appropriately, as does the Run/Disk/Tape/Network cluster. But from the moment KLH10 is started, every single segment of the main display is ON and remains ON until the host machine is powered off. Any suggestions? Is this normal behaviour? Is it just that the thing is running too fast for me to see any patterns? Does the Panda Panel care what mode the parallel port is set to in the BIOS? The fact that the other parts of the panel do the right things suggests to me that the interface etc. is basically sane... but the one photo I've ever seen of an operational panel looks quite different... http://www.sparetimegizmos.com/Hardware/images/Lingling.jpg Thanks Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

10 years, 8 months

1
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FW: NitrOS-9 6809 L1 v3.3.0 has just been born on the Multicomp09!

by computerdoc＠sc.rr.com

Hi Guys, I wanted to give you guys an update on the latest progress on the Multicomp09. Neal Crook has just completed modifying the boot process in NitrOS-9 6809 L1 v3.3.0 and it is now booting flawlessly on the Multicomp09! I have updated my Multicomp09 with Neal's latest VHDL code and also with the latest Multi-software environment as well. I'm proud to announce that I too now have NitrOS-9 6809 L1 v3.3.0 running on my Multicomp09 as well! Whoo-Hoo! NitrOS-9 6809 L1 v3.3.0 was just born on the Multicomp09 a day or two ago so it is by far not fully tested though I'm not expecting any big hiccups at this point. Everything I've tried so far has worked fine if I recall correctly. I've been up most of the night checking it all out. :P I've changed from the default shell that comes preconfigured with L1 to Shellplus so now I have my cd command back that I'm so used to using in L2! Finally I can traverse directories with ease. I've created a /T2 device for serial port A on the Multicomp PCB. I connected putty on my laptop via a USB to serial cable and now I have a fully usable NitrOS-9 Terminal on my laptop! It's a 2 User system now. One of the next hurdles will be to get the other serial port running. There are 4 - 720KB virtual floppy drives online with the boot dsk image file on drive 0 of course and at this point the same image on the other three virtual floppy drives just to get the system up and running. With a fully functional serial port, I'm eager to see about getting Drivewire 4 up and running though 64KB of ram might be pushing it a bit. We'll see how that goes. I'm going through various commands now to make sure everything works. The device descriptor for serial port A, /T2, will need to eventually be included in the OS9Boot file as /T1. Some unneeded modules currently exist like bitbanger stuff which are not needed on the Multicomp09. Since I have shelled /T2, I can work on this at my favorite hang out at my favorite table in Mickey D's! Cool! By the way, are any of you guys on Skype? We could have a little video conference on the Multicomp! :) Take care my friends. Kip Koon computerdoc at sc.rr.com http://www.cocopedia.com/wiki/index.php/Kip_Koon

10 years, 8 months

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HP & 800BPI / was Re: Tape cleaner on eBay

by marc.verdiell＠gmail.com

Thanks Brent, I had used your very helpful site before to help me figure out IO cards, but had missed this gem. Marc ================================== From: Brent Hilpert <hilpert at cs.ubc.ca> On 2015-Oct-10, at 9:59 PM, Marc Verdiell wrote: >> I had originally written it in a re-targetable cross-assembler in a > now-outdated development environment under MacOS9. >> Last year rewrote someone else's assembler (C source) - it should work in > any standard C environment. >> Was using it to re-assemble HPBASIC. >> [...] Can send you the source if you wish. > > I'll gladly take the source, that would be very helpful later on. Forgot, it's online already: http://www.cs.ubc.ca/~hilpert/e/HP21xx/software/index.html

10 years, 8 months

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WTB: Compaq Portable 386

by COURYHOUSE＠aol.com

the Compaq III is quite cool there was also an add on docking thingie too to go with it. .... IBM also made a ps2 sort of one with a plasma screen on it too that was a box that closed up on it self. used to be able to find these in thrift shops often but these days you seldom see them. I got one and used it for a while until the power supply quit. For now it will have to remain a static display... for a while anyway. (schematics or maint. manual anyone!?) I even used to find Burroughs BTOS desktops in T shops but now what I need one for a display here at the museum.... none to be found! Need some to sit in the middle of these photo panel and some incredibly neat promotional items related to that computer Burroughs had put out at one time. Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 10/11/2015 7:53:11 P.M. US Mountain Standard Time, nw at retrocomputingtasmania.com writes: On Mon, Oct 12, 2015 at 12:49 PM, drlegendre . <drlegendre at gmail.com> wrote: > I believe that I do have one of these machines, and it's in good working > order as of a couple months back. You're looking for a Portable /// > correct? > > Are you in the USA? > Hi Bill, thanks for the follow-up, seeking the updated variant known as the Compaq Portable 386. https://en.wikipedia.org/wiki/Compaq_Portable_386 I'm in Australia but willing to pay the shipping to get it here.

10 years, 8 months

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WTB: Compaq Portable 386

by nw＠retrocomputingtasmania.com

If anyone has one they want to offload I'd be keen to hear about it please. thanks.

10 years, 8 months

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blog entry

by tonypf11＠gmail.com

Hello, 4 hours ago I posted an email concerning a huge amount of documentation that I have. I also included about 30 pictures. I can find no indication that this email was distributed. Is there a problem with this information? Was it received? Tony Pflum

10 years, 8 months

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DEC H7140 (11/44) power supply revisions and general advice?

by ard＠p850ug1.demon.co.uk

> > Once again, I find myself in over my head debugging a power supply, this > time an H7140 from a PDP-11/44. Here's the skinny: That doesn't surprise me, the H7140 is one of the most complex PSUs you are likely to come across... > When power is applied (plugged in, breaker switch flipped to "On") the > relay does not click - based on my readings of the manuals this should > happen after the bias voltages are up to spec. I measure 308VDC on the > lugs on the top of the memory board, so that's at least something > working. Getting to other points to test voltages is a bit more > difficult, especially with those high voltages in the way, what a nice > design :). That 300-odd volts comes from rectified (or voltage-doubled) mains. The relay is part of the soft-start circuit, it should operate after the 'bias' PSU has started up (it shorts out a resistor in the mains input circuit). With no other load on the supply you will get the 300V with the resistor still in circuit. There are _3_ SMPSUs in that box. One for the logic, one for the memory and one (known as 'Bias' in the DEC documentation) to power the control circuits, PSU control logic, etc. The last one is a relatively conventional SMPSU, it sounds like it isn't working. It's nasty in that almost all the circuitry is on the mains side of the isolation barrier, and an isolating transformer is almost essential when working on it. The chopper transformer is on the PSIU baseboard, the chopper transistor and much of the control circuity is on the 'Bias/Interface' PCB (leftmost board in the PSU box). Be warned, therefore that some circuitry on this board is not isolated >from the mains. I would start by seeing if the 12V (and 5V?) from the 'Bias supply' are missing. -tony

10 years, 8 months

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blog entry

by COURYHOUSE＠aol.com

dunno did not see it Tony - - maybe file to large? send to me direct to check out thanks ed Sharpe archivist for smecc In a message dated 10/11/2015 6:13:45 P.M. US Mountain Standard Time, tonypf11 at gmail.com writes: Hello, 4 hours ago I posted an email concerning a huge amount of documentation that I have. I also included about 30 pictures. I can find no indication that this email was distributed. Is there a problem with this information? Was it received? Tony Pflum

10 years, 8 months

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FS: Cray J932SE system

by ethan＠757.org

If anyone knows anyone looking for a Cray, Cray J932SE system. 32 proc, 2 megawords of RAM as I recall. Has VME IO subsystem, HIPPI channels on a lot of the CPU boards (originally was 4 x J932SE in a hypercube via hippi IIRC.) Has 4 SCSI disks (9GB) although has room for lots more (system checks disk firmware vendor.) I like it but no place to keep it and I don't want to keep moving it between rental house garages. It's currently in Norfolk Virginia, I'm in Northern Virginia. I have pics of it. I'm not sure the Unicos build I have is compatible with it, it kernel panics on startup. I have some software, the SWS Sparcstation 5. Uses 3 x 220v outlets @ 30 amps each. Here is some stuff from last time I played with it: https://users.757.org/~ethan/pics/geek/cray/ These are RARE. I think I know of two or three J932SE systems in the wild, one in Germany one in another foreign country. Was looking for $8500 or so. Pound for pound such a better deal than an Altair. -- Ethan O'Toole

10 years, 8 months

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HP & 800BPI / was Re: Tape cleaner on eBay

by marc.verdiell＠gmail.com

Brent Hilpert <hilpert at cs.ubc.ca> wore: >I had that problem with the stuck reel hubs. Failed to take my own advice-to-self to leave the reels unmounted and they stuck again, >although easier to get off this time as it hadn't been many years under pressure. I ended up covering the rubber hub with black electrical tape. That prevents it from sticking again. >I had originally written it in a re-targetable cross-assembler in a now-outdated development environment under MacOS9. > Last year rewrote someone else's assembler (C source) - it should work in any standard C environment. > Was using it to re-assemble HPBASIC. > [...] Can send you the source if you wish. I'll gladly take the source, that would be very helpful later on. Marc

10 years, 8 months

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Dead PET4032

by binarydinosaurs＠gmail.com

Hi folks, Some storage reorganisation last week uncovered a PET4032 I'd forgotten I had. Spotless internally (I remembered why later) and glass fuse intact so I attempted powerup. Nothing. No screen and no chirrup. Google + schematics time. I've checked AC voltage at the iron lump and all major chips + DRAM are getting the right voltages. The processor is generating a clock signal at PHI2 (~2.7V), I've checked continuity of all address and data lines for ROMs/processor/VIA/PIA. I can't check the contents of the Kernal ROM since it's not socketed and my track record of successfully removing big chips whole isn't good. One chip that does get hot is the Character Generator at UA3 which I was going to swap with the one in my other 4032, but that doesn't power up either. Presumably I can borrow one from a 3032 or 8096? A lot of the repair pages use a piggyback 6502/ROM/RAM add-in called a PETvet but all I have is a DMM, logic tester and other working PETs as sources of chips I can borrow. Are there any more steps I can try before checking ROM contents becomes necessary? Cheers. -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk

10 years, 8 months

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Symbolics MCD-405 tape drive / Georgens Industries

by aek＠bitsavers.org

Does anyone have a loose 3M/Georgens MCD-405 tape drive they could take board pictures and firmware dumps from, or any of the other MCD-40 series tape drives? I'm trying to figure out how similar it is to the one in the Apple 40mb tape drive. I was asked about recovering some tapes from a Supermac 40mb tape/disk scsi box, and I am trying to figure out what tape drive I might need to do it. It appears it is Gammamat format, which would work with the Apple drives, and I wanted to compare the firmware from a non-Apple, so I started looking around for SCSI Gammamat drives. I also thought this would be useful knowledge for anyone trying to dump Symbolics XL-Series DC2040 tapes. One interesting thing mentioned in the Amiga BTNTape tape handler was they mention it was possible on some MCD series drives to format a blank DC2000 tape. They mention formatting with 2:1 interleave. Sadly, there were also people who said there was a tech manual available from Georgens on the series, but they didn't want to spend $50 for it. Georgens Industries was in San Diego and there still a few traces of them, but they are long gone at their last adr. I see that Chuck mentioned they were into the maintenance biz, Georgens was involved with DEI down there looking at his patents, and bought 3M's streamer tape line. Places like Weird Stuff have piles of the DC2000 floppy tape drives, need to do more digging to see if there are any SCSI ones around. Then, I have to redo the pinch roller. All the Apple tape drives have been dead for over ten years with rollers turned to orange goo.

10 years, 8 months

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UNIBUS RAM with Parity vs. None

by billdegnan＠gmail.com

(cross posted to MARCH list) Question about UNIBUS RAM with Parity vs. None I assembled a pdp 11/05 in a BK11-K box with a sticky 5 light - I can load an address, but the 5 light will erroneously (often but not always) light when I examine. Once 5 is turned on it stays on, even if the toggle switch is down. Once this occurs I cannot deposit nor can I examine contents of RAM. I intend to test the front panel to verify that toggle 5 is ok electrically, this is a to-do. The power checks out including DC LO AC LO. I transplanted the CPU cards into another system to test and they work also. Aside from the console itself, it must be a RAM problem. The system has 8K Core G235 (xy drive module) H217D (memory stack) G114 (sense / inhibit) M8293 (memory control module) My question - I have read, and to the best of my understanding believe I can swap an H217D with an H217C in this box. Anyone disagree, and if so why did DEC want their 11/05 S to use "D" model core (D=parity) and not C (C=no parity)? The PDP 11/40 I have uses C. -- Bill

10 years, 8 months

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DEC H7140 (11/40) power supply revisions and general advice?

by derschjo＠gmail.com

Hey all -- Once again, I find myself in over my head debugging a power supply, this time an H7140 from a PDP-11/44. Here's the skinny: I examined the supply physically before experimenting and found a capacitor on the Bias/Interface board that was leaking, bursting and rather burned-out looking (not a great sign) -- this is capacitor C4 in the printsets on Bitsavers (http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp11/1144/MP00897_11X…) Everything else looked OK physically; I replaced the obviously bad capacitor at C4. When power is applied (plugged in, breaker switch flipped to "On") the relay does not click - based on my readings of the manuals this should happen after the bias voltages are up to spec. I measure 308VDC on the lugs on the top of the memory board, so that's at least something working. Getting to other points to test voltages is a bit more difficult, especially with those high voltages in the way, what a nice design :). Switching the front panel switch to "Local" (or any other position) has no effect -- no fans, no LEDs, nothing. I've double-checked all the wiring and everything looks OK. Capacitor C4 looks to be involved with the START-UP DRIVE signal circuitry (which drives the relay) so the behavior I'm seeing makes sense if C4 died and took a couple of things with it (or if something else died and took C4 with it). Here's where it gets kind of odd -- I spent some time testing diodes and transistors in the related area near C4 and while doing so I noticed that there are four diodes (D1-D4) listed on the schematic that are missing from my board. "Missing" as in someone clipped them out at some point -- there are just nubs of the leads left. I'm not sure why this would have been done, but there were a number of ECOs applied to this board (a few wires and resistors added) and I don't want to assume that if I just put four new diodes in that it won't cause other problems. Anyone know if there were other revision levels of the bias/interface board that would have done away with these diodes? Anyone have an H7140 they can easily crack open to compare? (It's actually relatively easy to get to, if you can get to the supply...) Thanks as always, Josh

10 years, 8 months

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Identification of IBM SMS backplanes

by kylevowen＠gmail.com

Found some IBM parts recently. Any idea what specifically these might have come out of? I'll be picking them up soon and getting more pictures, but here's a few for now. http://imgur.com/a/pikqG Thanks, Kyle

10 years, 8 months

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Q-bus I/O project

by wilson＠dbit.com

This may never see the light of day (if the prototype turns out to be stillborn) but it's pretty and I can't resist posting a pic before I've powered it on and proven its uselessness: http://www.dbit.com/wilson/projects/qba.jpg Officially it's for my morally repugnant attempts to earn a living (so it's supposed to be a Q-bus bridge that connects over Ethernet), but I wanted to still be able to do something fun in the very likely case that the Ethernet port doesn't work (no idea if my PCB layout is kosher for something as fast as the gigabit PHY's bus) or has uselessly high latency, so I added an SD card slot and made all the CPU-end terminators switchable, so it can act as just a plain peripheral (I'm mainly thinking disk controller -- I've already found a reason why the USB device port can't work), if its CPU's alive and can talk to the Q-bus. We'll see. Many many many chances for mistakes. Five different power-supply voltages, for starters. As always, I can't say enough good things about XMOS microcontrollers and OSHpark.com. John Wilson D Bit

10 years, 8 months

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WTT: My Amiga Mouse for your Atari ST Mouse!

by ethan＠757.org

Looking for an Atari ST mouse, have an extra Amiga mouse to trade? Also looking to buy a 520ST power supply to complete a system if anyone knows of extras. -- Ethan O'Toole

10 years, 8 months

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MEM11 status update

by ggs＠shiresoft.com

I wanted to let folks know what the current status is on the MEM11 project. I apologize in advance for the long post. Previously I had mentioned that the emulator was fully functional (more on that later) and that I was starting to debug the MEM11 firmware. I have made significant progress and I'm in the final stages of testing the recovery image firmware and the configuration image firmware. In reality, the recovery image firmware is a heavily stripped down version of the configuration image firmware - I had to make space for all of the strings, in the configuration image the strings are kept in FRAM. This usually means that I can do most of the testing in the configuration image and (with a few exceptions) I'm assured that it'll work properly in the recovery image. The recovery image is what will be in the J1's RAM (in the FPGA) after reset. It is also the "cold boot" loader. Depending upon configuration settings and a couple of jumpers, it looks for a version of firmware to run. Recall that there are up to 5 copies of the firmware: 2 copies of the "run time" firmware, this is what makes the MEM11 a set of Unibus devices 2 copies of the "configuration" firmware, this allows you to configure the board, load new firmware, load/save memory, ROM images and RS11 disk images 1 copy of the "configuration" firmware that is deemed "safe". This copy cannot be updated except by the recovery image The recovery image is part of the FPGA programming so it cannot be updated in the field. The recovery and configuration images support the XMODEM protocol for uploading/downloading FRAM contents. I'm going through and exhaustively testing all of the command and checking that they produce the proper results and leave no extraneous bits on the stack(s). I haven't been able to do any testing on the XMODEM command yet because I don't have support in the emulator for connecting other programs to the console. So once all of the other commands have been tested, I'm going to extend the emulator to handle some other devices. I'm also going to add some scripting capabilities. I'm getting really tired of typing some commands (the first 3 in the session below are burned into my brain). It should also allow me to provide some capability to emulate the Unibus side of things once I get to the point of testing out the runtime firmware. Here's a short session on using the emulator: $ gforth emulator/j1-emulator.fs J1> mode status 0008 J1> load 60000 mem11-cfg.img J1> get j1-boot-ram.img J1> run MEM11 Recovery Interface MEM11 Firmware Version 0.4 (EMUL) RECOVERY> help Commands: BOOT Boot selected image CLEAR Clear specified memory region DUMP Dump out a section of FRAM MAP Display FRAM address map MODIFY Modifies contents of FRAM VERSION Display version RESET Perform a HW reset XMODEM Download into FRAM using XMODEM protocol SET Set configuration information SHOW Show configuration information Additional help: HELP <command-name> RECOVERY> boot safe MEM11 Command and Configuration Interface MEM11 Firmware Version 0.3 (EMUL) SAFE> help Commands: BOOT Boot selected image CLEAR Clear specified memory region DUMP Dump out a section of FRAM ENABLE Enable indicated UNIBUS device DISABLE Disable indicated UNIBUS device EXAMINE Examine J1's RAM LIST Lists names of images MAP Display FRAM address map MODIFY Modifies contents of FRAM POKE Change J1's RAM VERSION Display version RESET Perform a HW reset XMODEM Download into FRAM using XMODEM protocol SET Set configuration information SHOW Show configuration information Additional help: HELP <command-name> SAFE> set defaults SAFE> show dl11 0 ENABLED SLOT: 3 CSR: 777560 LENGTH: 000010 INT VECTOR: 060 INT PRIORITY: BG4 BAUD RATE: 9600 PARITY: NONE DATA BITS: 8 STOP BITS: 1 SAFE> show memory ENABLED BASE ADDR: 000000 LENGTH: 760000 SAFE> show kw11l DISABLED SLOT: 7 CSR: 777540 LENGTH: 000010 INT VECTOR: 100 INT PRIORITY: BG6 LINE FREQ: 16667 uS SAFE> list boot-image 0 : <NO IMAGE> 1 : <NO IMAGE> 2 : <NO IMAGE> 3 : <NO IMAGE> B SAFE : MEM11 Config V0.3 (EMUL) Built on Fri Oct 9 20:18:31 PDT 2015 SAFE> Execution Stopped at: PC: 016C J1> help Commands: HELP - Help command DUMP - Examine the contents of FRAM MODIFY - Modify the contents of FRAM EXAMINE - Examine the contents of J1 RAM PATCH - Modify the contents of J1 RAM CLEAR - Clear the contents of FRAM LOAD - Load FRAM from a file SAVE - Save FRAM into a file GET - Load J1 RAM from a file QUIT - Exit the emulator RUN - Run the J1 program STEP - Single step the next J1 instruction BREAKPOINT - Set a breakpoint CONTINUE - Continue J1 execution .R - Dump the J1 return stack .S - Dump the J1 data stack .PC - Display the current J1 program counter DEPTH - Report the depth of the J1 data and return stacks TRACE - Control tracing of J1 instructions RESET - Reset J1 and the emulated peripherals MODE - Set or view the MEM11 mode LED - Display the LEDs that would appear on a MEM11 board Typing 'HELP <command>' will give additional details about the command J1> .s DSP: 5 ST0: 0005 Data Stack: 5 : 0000 4 : 1E1E 3 : 1E6E 2 : 1E1E 1 : 0000 J1> .r RSP: 6 Return Stack: 6 : 0D84 5 : 0D4A 4 : 0D7E 3 : 1C1A 2 : 3B26 1 : 3BB2 J1>

10 years, 8 months

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Z system pics

by sales＠elecplus.com

More pictures have been uploaded. https://drive.google.com/open?id=0BxqLDyoLYuCKZmNsZlo1U0JyVkE Cindy --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

10 years, 8 months

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Smalltalk-78 resurrected in a web-browser

by nw＠retrocomputingtasmania.com

A mix of Smalltalk luminaries have resurrected Smalltalk-78 (a port of Smalltalk-76 to an early 8086 prototype luggable called NoteTaker http://bitsavers.trailing-edge.com/pdf/xerox/notetaker/) and it runs in a modern web-browser using Javascript (even runs on an iPad but will need changes to support touch). http://lively-web.org/users/bert/Smalltalk-78.html PDF describing what they did here: http://www.freudenbergs.de/bert/publications/Ingalls-2014-Smalltalk78.pdf According to this document there is yet to be published Java implementation too. A 35-minute video presentation: https://www.youtube.com/watch?v=pTh65b8qSY8 https://www.youtube.com/watch?v=R3t13RHO3X8 Smalltalk-78 compliments the Smalltalk-72 Alto emulator from Dan Ingalls released in 2013, although the link I found doesn't seem to work anymore: http://lively-web.org/users/Dan/ALTO-Smalltalk-72.html. It almost works, but the display is messed up on Safari/Chrome.

10 years, 8 months

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Computers in Election Vigils - take two

by mattislind＠gmail.com

Unfortunately SVT ?ppet Arkiv is not available to anyone outside Sweden, which is a pity. A great source. This interest for computers and election vigils come from the fact that I had a email conversation with a person that was involved when DEC won the contract to for the election in 1976 in Sweden for SVT. He was involved in adapting the VT30 system for TV use. Genlock and stuff. I found three clips in ?ppet Arkiv which I trimmed down heavily. These shows tend to be quite long anyhow. I hope SVT is not getting mad now. https://www.youtube.com/watch?v=qDoFM3hfbic /Mattis

10 years, 8 months

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Z system link correction

by sales＠elecplus.com

https://drive.google.com/file/d/0BxqLDyoLYuCKVWNYVEk1cjJwLWM/view?usp=sharin g Try this link; it should work. Cindy --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

10 years, 8 months

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HP & 800BPI / was Re: Tape cleaner on eBay

by marc.verdiell＠gmail.com

Glen, I'm right in the middle of resuscitating an HP7970E (1600 bpi with the HP-IB interface). The main problem I had so far was the rubber in the reel hubs had completely fused to the tape reels that were left on the hubs. I had to disassemble the hub locking mechanism and use lots of careful X-Acto knife work to separate the two. A few tape rollers were rough or stuck - just oiled them for now. Then it started to work, I am very surprised. There are three red switches on the motor control board inside to make the tape go forward, reverse and fast rewind. So it's pretty easy to test if the transport works and the motor servos and tension arms move how they are supposed to. Brent, Wow, looked at your site, and you actually wrote a HP 2100 cross-assembler? Nice. Would it work for the HP21MX too? Did you compile it using the command line tools in XCode? Marc ========================================================== Date: Wed, 7 Oct 2015 13:29:37 -0700 From: Brent Hilpert <hilpert at cs.ubc.ca> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: HP & 800BPI / was Re: Tape cleaner on eBay Message-ID: <858603D2-2D79-45D6-993C-A8939D996815 at cs.ubc.ca> Content-Type: text/plain; charset=us-ascii On 2015-Oct-07, at 12:56 PM, Glen Slick wrote: > I have an 800BPI 7970B in a 2113B rack system. I've never gotten > around to trying to get it up and running. Are they fairly reliable > drives to get going again? I don't have any other 800BPI drives to > write any tapes to read with it. >On Wed, Oct 7, 2015 at 12:46 PM, Brent Hilpert <hilpert at cs.ubc.ca> wrote: Well, the unit here was in pretty good physical condition as received. It had a cascading failure in the capstan driver but it was a fairly straightforward fix. I think there was one sluggish/partially-seized pulley bearing (freed up with some oil). Pretty rugged drives as you know. I wonder about the capstan rubber in the long term but I think that's about the only thing to worry about on age alone. I think bitsavers nowadays has manuals and schematics for the B version as you have, years ago I had to do some reverse-engineering for the capstan repair. This page is over ten years old and needs some updating, but FWIW: http://www.cs.ubc.ca/~hilpert/e/HP21xx/HP2116CSys/index.html Note the tape drive repair log page linked there.

10 years, 8 months

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MFM Emulator

by cctalk＠fahimi.net

Hello All, This is just a general shout out and thanks to David (Gesswein) for the excellent work on the MFM emulator boards. I received both of my fully assembled emulators today. They arrived professionally packaged and ready to go out of the box. I wish more hobby/home brew projects went this smoothly and bore such excellent fruit. Kudos to David! -Ali

10 years, 8 months

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