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

by dgriffi＠cs.csubak.edu

If you have any broken Apple Disk IIs lying around, don't trash them. They appear to be excellent hosts for an all-in-one Discferret/Kryoflux setup with two drives. More to come later. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

14 years

6
7
0 0

Polaroid Film Recorder (was Re: Film Recorders (Agfa PCR II))

by ethan.dicks＠gmail.com

On Sun, Jun 24, 2012 at 4:04 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote: > I might be able to help, though. I have a 'Polaroid Videopritner 4', for > all Polaroid assured me they had never made such a beast... This is > similar, but lower-reulotuon device, it displys TV-rate video on an > internal CRT and photographs it. > > There's a colour fitler wheel (red, green, blue and a hole) so it cna > print a colour inamge in 3 goes. I have a similar device - two actually. The first one I got for free or nearly free, with a Polaroid camera, and no control panel. The second cost under $100 and had the control panel and a 35mm camera, so between the two, I have one useful unit. The Polaroid film in question was sold for medical uses, so was quite expensive even 20 years ago when one could buy it off the shelf ($50-$70 per cassette, I was told). Like your "Videoprinter 4", mine has a mono CRT and a color wheel. AFAIK, it does *4* exposures - R, G, B, and "contrast" (no filter). It takes in an EGA signal or NTSC video, and has onboard memory for frame capture of live video. I've done some sample image grabbing >from a movie on laserdisc, and for practical uses, I use to make title slides with it, back when we used 35mm slide projectors for presentations (I produced the slide content on an Amiga since that was the easiest thing to use that I had on hand). Back when slide houses charged several dollars each for presentation graphics, this was a moderate-quality way of doing my own interstitials for slide shows for the cost of one roll of ordinary 35mm slide film ($4-$5 for a roll of Fuji E-6 ASA 100 film, $7-$8 for processing and mounting). I haven't used it in years, but it was great 15+ years ago when I first got it. -ethan

14 years

2
1
0 0

ST-506/412 to IDE/ATA/SCSI/? adaptor

by dm561＠torfree.net

----- Original Message: Date: Tue, 26 Jun 2012 09:22:01 -0400 From: David Riley <fraveydank at gmail.com> On Jun 26, 2012, at 5:43 AM, David Brownlee wrote: >> Does anyone know of any adaptors to fit a "modern" drive (be it IDE, >> SCSI, ATA, CompactFlash etc) into a machine with an ST-506/412 interface? > That... would be quite the task. The ST-506 and cousins directly output > the raw flux transitions as their data, so you'd need an emulator which > spit out the data as repeated cylinders, I believe. Trying to interpret > incoming data as low-level formatting would be another matter entirely. > You'd probably be better off emulating the interface to the drives (e.g. > emulate an MFM controller). -------- Reply: The main problem I see is that while the ST506/412 interface is standard, there are quite a few different interfaces between an MFM controller and the various systems (S100, DEC, PC etc.) and there are probably as many different formats as there are controllers, so you'd have to emulate quite a few different controllers. But I've always wondered (and this may be a silly question): if a controller in a 4.7MHz PC can handle the data flow, why would it be so difficult to basically just connect another (pseudo-)HDC to the target HDC instead of a drive, i.e. effectively connecting two HDCs together back to back? Host MFM HDC || || Data/Control bus || || 'Reverse' MFM pseudo-HDC & uC ||||||| ATA bus or equiv. ||||||| IDE/CF/etc. drive. Assuming that the chips are available it doesn't look too difficult to effectively clone a WD HDC and let it pretend to be a drive. What's the obvious flaw that I'm missing?

14 years

1
0
0 0

1951? IBM Typewriter

by rampaginggreenhulk＠yahoo.com

I have one. Pretty good relative condition overall. When I plugged it in oh 3 years ago, it actually *typed*, albeit very veeeeeery sloooooooow. 50$. From 07731. About 40 lbs. packed. Pictures upon request.

14 years

1
0
0 0

Emulex QD21 firmware

by lists＠loomcom.com

I've got an Emulex QD21 (Qbus ESDI controller) with a Rev. D firmware on it. The later revisions of this card (Rev. E and later) shipped with a much nicer firmware that included autoconfiguration, and a menu-driven formatter and diagnostics package. Does anyone happen to have a ROM image for Rev. E or later? I'd love to upgrade my board. -Seth

14 years

5
6
0 0

BEGINNER getting started (Was: Diagnosing and Reparing Commo

by cym224＠gmail.com

On 24 June 2012 22:52, Zane H. Healy <healyzh at aracnet.com> wrote (in part): > At 10:44 PM -0400 6/24/12, David Riley wrote (in part): >> >> On Jun 24, 2012, at 7:23 PM, Fred Cisin wrote: >>>>> ?"Art of Electronics" by Horowitz is GREAT, but it costs money. >>> ?On Sun, 24 Jun 2012, David Riley wrote (in part): [...] >>> ?Really? >>> ?Seriously, ?What am I doing wrong? >>> ?Amazon has one copy of the 1982 edition for $176 >>> ?and no copies right now of the 1998 or 2011 editions. [...] > You might want to try www.abebooks.com, or Alibris (no, I didn't check). International versions of the second edition are available for under $30.

14 years

3
3
0 0

IBM Model B typewriter for IBM 1620 or PDP-1

by vier321＠hotmail.com

Hi Folks, I have an original IBM model B computer controlled typewriter witha lot of spares and maintenance manuals available for sale ortrade. This stuff is impossible to find. As used on the IBM 1620,DEC PDP-1 and many other computers of the era. Useful if you'remaintaining one of those or want to build a replica/simulator. Respond to me directly as I'm not a member of this list. Thanks, Erik

14 years

1
0
0 0

Film Recorders (Agfa PCR II)

by Arno_1983＠gmx.de

Hello Dr. Duell! ard at p850ug1.demon.co.uk (Tony Duell) wrote: > How comples is this controller board that's removed? Is it possible to > recreate it, and thus covnert a normal Nikon camera to work with the > film reocerder? The board doesn't look overly complicated to me (there is a raster image on the page I linked to), all it has on it besides a DIP-16 IC is a resistor, a tantalum cap and another axial component which is obscured by wires in the pictures, possibly a (zener?) diode. The print on the IC is alas covered by a large sticker reading "IC# 7" that IME often indicates it is a custom-programmed part anyway. > Alas (for you), the only Nikon I own has no electtornics in it at all. > The only electrical part is the flash contact. > > -tony If it has provisions for both a motor winder and an external shutter release, I'd suspect you'd find a way to interface it nevertheless, were you to try... One more interesting question would be what kind of lens is required for the recorder application. IIRC there are no refractive optical elements inside the recorder stand as it is now, the CRT faceplate is in plain sight behind a cover glass and the selected filter. I can't measure the distance right now as the recorder is in storage, but I'd roughly estimate somewhere around 20-30cm to the camera seating plane. Arno -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

14 years

3
3
0 0

Tektronix 4052 Firmware

by rickb＠bensene.com

Thanks, Glen, Anyone know of a cheap gizmo that will program the Motorola MCM68766? My programmer does not support it. -----Original Message----- From: Glen Slick [glen.slick at gmail.com] Received: Saturday, 23 Jun 2012, 8:46pm To: General Discussion: On-Topic and Off-Topic Posts [cctalk at classiccmp.org] Subject: Re: Tektronix 4052 Firmware Is the MCM68766 a compatible replacement EPROM? Those are available for $8 each at www.unicornelectronics.com

14 years

2
1
0 0

Manx 2.0 beta

by legalize＠xmission.com

Things have progressed nicely on Manx and I now have a reasonable UI for adding new online documents to the system. I've also fixed some bugs and added a few other minor features. I'm inviting the cctalk community to beta test the changes and report any issues using the tracker on the codeplex project page: <http://manx.codeplex.com/WorkItem/Create> You will need an account on codeplex to create issues. Creating an account is free and you will not receive any spam. The beta is hooked up to a separate database, so you can't break anything in the current system. Manx 2.0 beta: <http://manx.classiccmp.org/test> Login with these credentials: email: demo at example.com password: demonstratus Try the URL Wizard to add new documents for existing sites, new sites, or from mirrors known to manx of sites already known to manx. Changes from Manx 1.0: All users: - RSS feed published of 200 most recently added documents - Fixed problem with page title on details page - Details page for a publication links company name to search of docs for that company. - About page updated - Help page updated - UTF-8 now handled properly throughout Logged-in users: - See table of known mirror data - See table of known site data - URL Wizard for adding documents From a URL, try to figure out as much as possible, such as: * part number * document title * document publication date * company * site owning document * document format (PDF, etc.) All fields can be edited if the wizard makes a poor guess from the URL. The wizard is able to guess most information if the URL is on bitsavers. The wizard uses AJAX to obtain information from the database, so you will need a JavaScript enabled web browser for the wizard to work properly. Some error checking has been done, but the wizard could probably use additional checks and preventions against duplicate or badly formed data. There are no instructions on the Wizard page, but generally the idea is that you start by pasting in the URL and tab from field to field adjusting all the data as needed. If any field contains invalid data, it's label will be changed to red when you attempt to advance the wizard by clicking the button. Please create issues in the tracker for anything you find! -- "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> The Computer Graphics Museum <http://computergraphicsmuseum.org> The Terminals Wiki <http://terminals.classiccmp.org> Legalize Adulthood! (my blog) <http://legalizeadulthood.wordpress.com>

14 years

1
0
0 0

Users of K52 and K62 variants of KED

by jhfinedp3k＠compsys.to

Of the nine variants of KED developed by DEC, it seems doubtful that either K52 or K62 are in use at this point. I have mentioned in the past that a new variant, K42, which now supports a VT420 with 48 lines is available. Inspection of the code for K42 suggests that improvements can be made with respect to the allocation of memory. In particular, while K42.SAV is LINKed to execute under an Unmapped RT-11 Monitor, for versions of RT-11 which include VBGEXE, virtual memory can be used under a Mapped Monitor. These same improvements to K42 can also be added to K52 and K62 so that if these variants are executed under a Mapped Monitor, more efficient use can be made of the available memory. One of the improvements can be an increase in the size of the cut and paste buffer. If no one still uses a VT52 or a VT62 terminal, then there does not seem to be any point to including these improvements in K52 and K62. Please respond if there is any interest to actually use K52 or K62 under a Mapped RT-11 Monitor. Jerome Fine

14 years

1
0
0 0

Tektronix 4052 Firmware

by rickb＠bensene.com

Hello, all, I have a Tektronix 4052 Graphic Computer that I believe is in workable condition, but the old Mostek MK36xxx-series mask-programmed ROM that holds the operating firmware for the machine have failed, which is apparently a common occurrence for these devices. I have found numerous mention of these ROMs having been used in test equipment that "forget" after 10 to 15 years after production. I found the archive of 4052 firmware on Bitsavers, but am wondering if anyone out there has any suggestions as to what to do to replace the failed ROM with something of more current technology that will work. The firmware consists of 64K bytes of code. The Mostek ROMs are 24 pin devices, 5V supply, that use a clocked chip select signal, meaning that any replacement will have to emulate the clocking access scheme. There were Motorola-made programmable devices that could directly replace the Mostek parts, but these seem to be virtually unobtainable today..and even if I could find 8 of them, I don't have anything that could program them. Any other 8K x 8 ROM is in a 28 pin package, which would require some clumsy adapters to work. Along with the ROM itself, the 4052 had a unique ROMpatch implementation that allowed up to 48 ROM locations to be ''patched' in real time, and this involved a PLA device that did the address matching, and a fast bipolar ROM that contained that data to be substituted at the location to be patched. Duplicating the patched code could also prove to be very difficult. I am wondering if anyone out there may have run into the same situation with a 4052 and came up with a solution. Any help would be greatly appreciated. Thanks, Rick

14 years

2
1
0 0

VT14, other PDP14 options available

by useddec＠gmail.com

I have a complete VT14 (except for possibly the cover screws) 14/30, 14/35, and a lot of options available for serious inquires. It was going to be a project down the road, but I need to shorten my list due to health issues, Does any else out there have one, or even know of one? Please feel free to contact me off list. Thanks, Paul

14 years

3
4
0 0

Homer lives

by spectre＠floodgap.com

This 9000/350 was Stan Sieler's, IIRC, and passed through an intermediary who couldn't maintain space for it, so I ended up with it and I put it in storage until I could get space myself. Now that I have space, Homer is resurrected. It is a 9000/350 (25MHz '020 + '881), 16MB RAM, 670MB main drive, HP-UX 8.0. And I still have 10b2 on my 10MBit backbone, so it plugged right in. http://www.floodgap.com/iv/1572 Testing the CPU (Homer doll came with it) http://www.floodgap.com/iv/1573 Self-test http://www.floodgap.com/iv/1575 Bringing up HP-UX http://www.floodgap.com/iv/1574 Old school X11 as God intended http://www.floodgap.com/iv/1576 Obligatory rear shot I figure Stan will enjoy seeing it's still out there and operational. -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- The best defense against logic is ignorance. -------------------------------

14 years

7
7
0 0

Z80 CPU microcode and internals

by dennis.yurichev＠gmail.com

Hi. I'm looking for any information related to Z80 CPU internals, microcode, sequencer, etc. Is it possible to rebuild it in Verilog/VHDL/TTL on breadboard with all that undocumented instructions, etc? Here is what I found so far about machine cycles, but obviously, it's not enough: http://www.msxarchive.nl/pub/msx/mirrors/msx2.com/zaks/z80prg02.htm

14 years

5
5
0 0

PC-Write and PC-File Shareware

by swtpc6800＠comcast.net

I am doing my once a decade or so clean up and sorting. I have found working distribution diskettes of the shareware software PC-Write and PC-File. I had to break-out a 5.25 inch drive to read these. My 2005 vintage XP machine only support on drive at a time so I have to open the case and hook up the 5.25 inch drive. I have transferred these disks to my network drive and have tested them on a Windows 98 laptop. I also have Norton Utilities and various copies of DOS going back to version 1.1. (Complete with packaging.) If there are any vintage PC users here I can email copies of the disk contents. Is there a program that makes an "ISO" type file of a bootable floppy? http://commons.wikimedia.org/wiki/File:PC_Write_text_editor.png Michael Holley

14 years

3
2
0 0

Interested in learning 68000 hard/soft

by rampaginggreenhulk＠yahoo.com

Andrew, Ive never seen its schematic, but the Apollo mobo I have is the most basic 030 Ive seen. Granted Ive really only gawked at Macs. Ill need to pull it out of storage. The only feature that stood out is a big ugly black chip that one might suspect was a mmu. It is a big mobo though. Maybe someone else can chime in.

14 years

1
0
0 0

Weird Prices on E-Bay

by dave.g4ugm＠gmail.com

Folks, Any thoughts on what one of these is really worth? http://www.ebay.co.uk/itm/HP-7550-Plus-8-Pen-Colour-Plotter-Boxed-Vintage-Ra re-/130709681274 I know it is a high speed HPGL/2 capable plotter and I would really like it but $2000.... Dave Wade G4UGM Illegitimi Non Carborundum

14 years

15
41
0 0

Found: paper tape for "L8/9" computer ... unknown

by dm561＠torfree.net

----- Original Message: Date: Wed, 20 Jun 2012 10:53:01 -0700 From: Al Kossow <aek at bitsavers.org> On 6/20/12 10:44 AM, Stan Sieler wrote: >> thanks for the kind offer! If Bob declines, I'll let you know. > CHM is interested, since apparently we have one. ------ Reply: Excellent; I assume that if they go to you there would be a way for someone who might need one to get a physical copy? m

14 years

5
5
0 0

Found: paper tape for "L8/9" computer ... unknown computer

by dm561＠torfree.net

Original Message: Date: Tue, 19 Jun 2012 16:50:56 -0700 From: Stan Sieler <ss at allegro.com> > hi, > I found a box of paper tape software for an unknown computer (possibly a > "L8" or "L8/9"?) > ... and it's looking for a home (cost of mailing): > If anyone can suggest what computer it's from, I'm curious! > Stan ----- Reply: Hi Stan, Those are firmware and utility tapes for Burroughs series L8000 and L9000 computers, the predecessors of the B80 and B90 series and fairly rare since they were dismissed as mere 'accounting machines' and not considered collectible by purists and people without storage buildings: http://www.picklesnet.com/burroughs/gallery/bpgltc.htm Several museums have one and last I heard Bob Rosenbloom also had an L9000, as well as an L5000; I imagine he would be delighted to have those tapes and might even need one or two since I doubt that there are more than a handful of those tapes left in the world and some of them are crucial to the machine's operation. If by any chance there are no other takers I'd gladly take care of them for you and posterity. m

14 years

3
3
0 0

TinyBASIC in HP2645A (was: Converting terminals into computers (was: Re: 1970s microprocessor magazine articles))

by ss＠allegro.com

Hi Klemens, Re: > We have working copies of these games: Keep on Drivin', Pong, Hacman > and Space Invaders run on our hp 2648 with a 8080 processor, and we > also have a version of Pong for hp 2644 with 8008 processor. Naturally > we saved them on our ftp-server. I never tried to load them via the > serial line, but would be interested to do that, because the cassettes > IIRC, we simply did the equivalent of "cat space.oct" or "cat pong.oct". (It was from MPE, so it was probably: FCOPY FROM=space.oct;to= ) I noticed in your README you mentioned overflowing the terminal at serial speeds ... that's solved by using enq/ack pacing, a strap you can enable on HP terminals (also called "flow control"). It's been awhile since I've used it, but I found a writeup here: http://docs2.attachmate.com/verastream/vhi/7.1/en/index.jsp?topic=%2Fcom.at… And, from Robelle's website at http://www.robelle.com/smugbook/network.html we see: ENQ/ACK is a proprietary method of flow control used on Classic MPE V systems and is still built-in to most HP terminals and enabled by default. The transmitter sends an ENQ (Enquiry, decimal 5, Control-E) every 80 characters (or so). When the receiver is ready for more data, it replies with an ACK (Acknowledge, decimal 6, Control-F). If there is no reply in 10 seconds, MPE V resumes printing printing (Term Type 10). If you disable ENQ/ACK on your terminal, you will see output interspersed with pauses. MPE/iX and HP-UX normally use XON/XOFF Flow Control instead of ENQ/ACK. So...you could have a little C program that loops: while data left > 0 if >= 80 bytes then write 80 bytes of data write an ENQ (decimal 5) read, waiting for an ACK (decimal 6) (preferably with a timeout of a second or two, in case ENQ/ACK isn't enabled on the terminal) else write remaining data Stan

14 years

1
0
0 0

HP technical manuals for PCL5

by swtpc6800＠comcast.net

In 1993 or so I wrote some software to print images from my video frame grabber to a HP LaserJet printer. I ordered the HP technical manuals for PCL5; they were free with my LaserJet 4. The manuals weight 7 pounds and are available for the cost of shipping. If no one wants them they are off to the recycle bin. HP LaserJet 4 and 4M Printers User's Manual PostScript SIMM Technical Reference PCL 5 Comparison Guide Printer Job Language Technical Reference Manual PCL 5 Printer Language Technical Reference Manual (3.5 pounds) PCL 5 Printer Language Technical Quick Reference Guide Michael Holley

14 years

2
2
0 0

Film Recorders (Agfa PCR II)

by Arno_1983＠gmx.de

Hello Folks, the recent talk about film recorders here made me think it might be time to mention one of my "wish list" items here again, just in case somebody happened across it recently. I know this is going to be a long shot but here is: I managed to secure an Agfa PCR II from University, but unfortunately it is missing the actual camera/optics/tubus assembly. The physical interface for it is a spare metal plate with two alignment holes and two thumbscrews on diagonally opposite corners, and a strange round 12-pin threaded connector for power and communication to the camera (shutter release, out-of-film signalling). There are several options available (the most common being 35mm and Type 120), but either people don't know what they are (which makes them difficult to find) or they know it (which renders them unaffordable, cf. http://www.mops-computer.de/plson01_.htm ) The standard one seems to be the 35mm cartridge film module, a modified Nikon N6000 a.k.a. F-601M camera. If these do appear in the market, they are sometimes converted back to standard, which involves removing a small controller PCB and rejoining some wire ends, cf. http://photo.net/bboard/q-and-a-fetch-msg?topic_id=23&msg_id=001BtO . Please let me know if you have any leads on such an item. TIA, Arno Kletzander. -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

14 years

2
1
0 0

Bits and pieces rescued from the remainings of the Computer Museum Aachen

by p.gebhardt＠ymail.com

Hi folks, I'd like to share with you my experiences, I made during March and April when most of the remaings of a big computer collection originally located in Aachen were thankfully mostly saved by the collectors in Germany. In March, there had been a brief discussion about remainings of the Computer Computer Aachen, Germany. As far as I understood, a couple of years ago, most of the collection could be saved thanks to the CHM and a donation of SAP, who made shipping from Germany to California possible from a financial point of view. The collection is since then known as the "SAP collection" and stored at the CHM.Bits and pieces, the CHM left behind in a warehouse in Dortmund, "re-appeared" in March. A very motivated person, who got informed about the vintage systems, tried then to locate and contact the renter of this warehouse via the landlord (which had to be located and contacted as well). It turned out that the content stored in this warehouse had to be cleared within 2 month, as the warehouse was going to be sold. This was a pure coincindence and destiny here was on the side of all those, who'd like to save ancient comouting systems from being scrapped, as that person actually tried to find collectors willing to save these remainings, as everything not saved would otherwise been scrapped. An post in a Robotron systems online forum (Vintage computer manufacturer from eastern Germany) had been placed with images of the parts. First come, first serve was the philosophy in order to give away for free the bits and pieces to collectors, whoever wanted to save these. I found the thread when I read about it here at classic-cmp, as another list member posted the information here and asked for information about and identification of the parts. So during the last three months, I went to this place more than once in order to try to save as much of complete parts as possible, I could, with the focus to get them back to working condition one day. During the first visit, other very nice collectors from eastern Germany were there as well. There was a very good atmosphere in trying to help each other to move heavy partsand cabinets around, to part with the bits in a fair way and to identify and estimate the conditions of these remainings. These are the days I like when you can meet new people who share this passion about vintage computing and save systems together from being scrapped. And that's how I have been knowing the collectors community in Germany so far. But for the first time, I also experienced different attitudes in this domain. With time, the discussions in that robotron thread where marked by rough tones of a person who stated that the remaings left behind by the CHM in that warehouse where "rejects" and therefore not worth or at least not interesting being picked up because of probably being incomplete and he treated the person who discovered the whole thing and opened the thread as unfair, as he felt the systems were already rewarded to others under doubtful circumstances. Another bad surprise, we had to face, was the behavior of a collector who was at the warehouse earlier than me and who took the opportunity to take with him two EAI 2000 analogue computers for somebody else, I originally was supposed to deliver to. The person in charge at the warehouse confound that guy with myself and asked him, if he was the one supposed to bring these machines to the person, who claimed interest in these. He said "yes" and took everything with him. Call it what you want, but that's seriously the first time, I face such nasty behaviour to put hands on vintage computers! I'd say that the real condition of a big lot of machines can only be identified properly, when being on site. That's exactly what I did. I stated interest in some parts of which I knew for sure that I could store them savely, in case their condition was satisfactory enough to resurect them to working condition one day. I also tried to save things which should belong together. Too bad, I was limited in space (the eternal problem). Otherwise I would have saved more. Anyway, the following could find a new home within "my walls". two Honeywell Bull Datanet systems (on Level 66 basis), can be hopefully transformed to normal mini-computer with approriate software Honeywell Bull reel tape drive with vacuum columns, complete (rebadged CDC tape unit, probably of type 669) Honeywell Bull terminal and printer Honeywell Bull disk drive (rebadged CDC BR3D4) with spare parts from another incomplete drive Control Data 604 Tape Transport Unit, all logic boards missing Control Data 854 Disk Drive, seems complete Control Data 841 Multiple Disk Drive, saved complete electronics and one complete disk unit with its hydraulic actuator, had no space for the entire cabinet :( Telefunken MDS-252 reel tape drive with vacuum columns, complete? (belonged to a TR-440 mainframe) Telefunken TR-4 console, complete? (rebadged IBM typewriter) Telefunken WSP-414 disk drive (rebadged CDS-drive) with concentrator-unit (complete) in order to connect up to eight drives to the TR-440 mainframe Telefunken LSS-150 power supply of a Facit paper tape unit DEC RP03, (ISS) with spare parts from another damaged and incomplete drive Pertec reel tape drive, complete NCR reel tape drive (rebadged CDC BW303 tape transport), one small PCB missing Logic boards from a CDC 608 tape unit (according to the person who organised the give-away, nobody ever showed interest in taking the complete unit) Unfortunately, I couldn't find documents online about all of these parts. So I'd kindly like to ask the list, if anybody has documents about the following ones, so that I could ask them in future, when I come to the point where I can start restoration of these: - CDC 604 and BW303 tape drives, 854 disk drive and 841 multiple disk drive - Honeywell Datanet (or Level 66 minis) documents and software - Telefunken schematics As you can see, I focused on peripherals, due to my particular interest in disk and reel tape drives. Maybe, a running Honeywell system can be obtained out of the stuff, I saved. Let's see how much can be resurrected of these in the years to come. Biggest problem regarding the disc drives will certainly be the missing disk packs and the probable re-calibration of the disk and tape units. The disk packs, I got from there, were all coroded to such an extend that they are most probably useless. The DEC RP03 drive came with two document binders containing schematics. Haven't seen them on bitsavers, yet, and will therefore scan them in near future. Kind regards, Pierre ------------------------------------------------------------------------------- Pierre's collection of classic computers : http://classic-computing.dyndns.org/

14 years

4
4
0 0

Three Tons of Minicomputers

by pontus＠Update.UU.SE

Hi This is a shameless plug for something I and the Update Computer Club have been working on this spring and opened yesterday. The exhibition "Three Tons of Minicomputers" at Museum Gustavianum in Uppsala, Sweden. We have collected computers primarily used by the university at some point in time. Highlights include a Linc-8 and a DECSYSTEM-2060 with peripherals. Here are some pictures from the opening: http://www.update.uu.se/~jeppe/tmp/vernissage/ I strongly recommend anyone nearby Uppsala this summer to take a swing by Gustavianum. If you want a guided tour, let me know and we'll figure something out. It's only open for a few months, so don't wait to long. Regards, Pontus.

14 years

3
3
0 0

relevant but OT: automatic document scanning

by jfoust＠threedee.com

At 09:26 PM 6/15/2012, steven stengel wrote: >I have used the Epson Workforce 645 - jammed a lot - I returned it. >I now use the Fujitsu Scansnap S1500 to scan BYTE and other magazines. >Works great, I love it - about $500 new. Great device. Yes, designed for extensive use. And they sell the consumables - cheap replacements for the pads and pick roller that might wear out after 50K or 100K scans. - John

14 years

3
2
0 0

utterly free Machine Language for the Commie 64, 128,...

by rampaginggreenhulk＠yahoo.com

just send me your address. Jim Butterfield. Sent or tossed by Monday.

14 years

12
34
0 0

looking for Apollo systems and parts, and to interface w/other Apollo groupies

by rampaginggreenhulk＠yahoo.com

There was a man in Kansas IIRC who had a bunch of Apollo stuff. I imagine it's long gone. If still available, please send me a private. I likely will be in that area w/i a month God willing. Never know what tomorrow will bring though. ?Come on Apollo gropies, I know you're out there. Let's be heard!

14 years

8
11
0 0

Desiogns/Plans/Board Layouts for 6809 System

by lynchaj＠yahoo.com

Hi >From the N8VEM home brew computing project wiki front page: The three 6809 standalone computer boards available in the Eurocard (160 x 100 mm) format; the 6809/6802/6502 host processor, its 6809/6802/6502 IO?mezzanine, and the 6809/6802/6502 bus bridge.? A redesign of the 6809 host processor board has been completed and the new version supports 6502 and 6802 CPUs in addition to the 6809.? ? All Eurocard ECB?format PCBs are $20 plus shipping which is $2 per board in the US and typically $5 per board overseas. ? http://n8vem-sbc.pbworks.com/w/page/4200908/FrontPage ? There are PCBs for the 6x0x host processor and associated boards still available.? There was quite a bit of active development on this system a few months ago. ? Thanks! Andrew Lynch ? ? --- On Wed, 6/20/12, Dave Wade <dave.g4ugm at gmail.com> wrote: > From: Dave Wade <dave.g4ugm at gmail.com> > Subject: Desiogns/Plans/Board Layouts for 6809 System > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > Date: Wednesday, June 20, 2012, 8:51 AM > Well we have had all the fun with 68K > designs, but I would really like > to build a 6809 system. Any one know of a source for boards > for a > simple system with say Serial Port and Parallel Port and > memory? >

14 years

2
2
0 0

Desiogns/Plans/Board Layouts for 6809 System

by dave.g4ugm＠gmail.com

Well we have had all the fun with 68K designs, but I would really like to build a 6809 system. Any one know of a source for boards for a simple system with say Serial Port and Parallel Port and memory?

14 years

5
8
0 0

Mac PALs (was: Interested in learning 68000 hard/soft)

by wrm＠retro.co.za

Hi Jecel and all >Back in 2005 someone posted the sources for all the PALs, I looked at >them, but didn't save a local copy. A quick search only showed the >source for the TSM (timing state machine) circuit in > > > http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=26198 Kryten saved some of what you posted, but his website also is no more. I sifted through archives, everything I could find as well as my own musings are up on http://www.retro.co.za/ccc/mac/ReverseEngineering/PALs.html >I did a clean room implementation of the PALs in 1987 that was better >(27% performance increase over the original) but don't have a copy of >the sources (I do have access to a machine with the actual PALs with my >design, however). Let's hope you didn't blow the fuses -- if you can, read them and post the results? Thanks W

14 years

1
0
0 0

PDP 11 rk05 controllor? pertec controllor?

by tdk.knight＠gmail.com

anyone got one of these they would be interested in parting with i've got a heathkit h11 lsi-11 to plug it into witch curently has rl02 hooked up to it and posibly a controllor for a pertec t6b40-9-45 9 track drive? the pertec drive in question http://bitsavers.org/pdf/pertec/tape/100884_T6x40-T6x60_Sep78.pdf i need it for this rack of stuff http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160748462238&ssPageName=… Adrian location Winnipeg canada

14 years

3
8
0 0

1970s microprocessor magazine articles

by swtpc6800＠comcast.net

For the past 5 years or so I have been collecting references on early 8-bit microprocessors, with an emphasis on the Motorola MC6800. The best source is trade magazines from the mid-1970s. I have a reasonable collection of McGraw-Hill's Electronics and a few issues of Electronic Design and EDN. I am old enough that I read all of these when they were new. I got a bunch >from eBay and another bundle from Steven Stengel on this list. I have not ventured over to the University of Washington yet, they have a good collection. (I can scan my individual issues at home.) Motorola did not chronicle their microprocessor development like Intel did. MOS Technology has Chuck Peddle telling an alternate reality version of the events. Chuck's enthusiastic promotion of the 6502 in 1975 was responsible for its success and his story has improved with 35 years of retelling. Rereading these magazines gives a better understanding of what really happened. Did you know that the Motorola 6800 and Intel 8080 both had their introductory articles in the April 18, 1974 issue of Electronics? I have uploaded a selection of articles to my website. http://www.swtpc.com/mholley/Microprocessors/Microprocessor_History.htm There is one issue with a 6800 article that I have not found is the November 20, 1974 issue of EDN, "A very complete chip set joins the great microprocessor race" starting on page 87. Has anyone got it? I wrote the Motorola 6800 article on Wikipedia and just updated the MOS Technology 6502 article. Michael Holley

14 years

12
22
0 0

cctech Digest, Vol 106, Issue 30

by michael.99.thompson＠gmail.com

> From:?"Brad Parker" <brad at heeltoe.com> > Date:?Mon, 18 Jun 2012 10:55:30 -0700 > Subject:?RE: emulated linux/bsd motorola 68k system? > > The code is pretty dense but also pretty complete. ?The sun-2 is 68010 > based. ?As I recall > > the sun-3 is 68020 based. ?I can't remember if there were any 68030 > based sun's. > > -brad I helped Matt get the Sun-2/Sun-3 emulator working by doing countless tests on my Sun 2/120. I still have the 2/120. The Sun 3/80, 3/460, and 3/470 are 68030 based. I have one of each. -- Michael Thompson

14 years

2
1
0 0

Dec Graphic terminal

by jws＠jwsss.com

I think it is anyway,. http://www.ebay.com/itm/110897384303 Dec VT Lan 40 terminal. Appears that it might take PS2 kb and mouse, and vga display. $75. Only mention because of the recent threads on dec terminals and the like. Jim

14 years

5
7
0 0

Found: paper tape for "L8/9" computer ... unknown

by dm561＠torfree.net

Original Message: Date: Wed, 20 Jun 2012 10:44:04 -0700 From: Stan Sieler <ss at allegro.com> Re: >> Those are firmware and utility tapes for Burroughs series L8000 and L9000 >> computers, the predecessors of the B80 and B90 series and fairly rare >> since > I should have realized this...I arranged the donation of a working > Burroughs L9000 to the Computer History Museum a few years ago (it had > been in constant use until a month before the donation). > Stan --------- Heh, heh; yes indeed. As a matter of fact I believe the pictures on the Pickles site of Betty and the L9000 that went to CHM originally came from you (DVQ), and you and I exchanged a few emails about it at the time. mike

14 years

1
0
0 0

Load Testing PDP11 Power Supplies

by jaquinn2001＠gmail.com

>Those are the massive ones sittng horizontally on the PCB, right? That is correct. >there's a smaller can-type electrolytic on the output side. Yes on the 7441 there are two small axial style electrolytic that stand vertically on the PCB. These are small and cheap enough here to just replace so I think I will do that. >re suppliers Yes we have RS Components here in NZ and they have a good range of parts and generally the pricing is fairly reasonable. No freight charges on internet orders even if they bring the stuff in from the US or UK. Sometimes I wonder how they make money when I receive individually bagged microcontrollers for a few $ each shipped from the US. Must be some margin in there somewhere. I did find http://newzealand.rs-online.com/web/p/aluminium/2508858302/?searchTerm=2508… which meets the specs but is very expensive down here. Based on your suggestion that 22000uf 50V would likely be OK I wonder if the following part might be an alternative: http://newzealand.rs-online.com/web/p/miscellaneous/2550081355/?searchTerm=… Considerably cheaper down here. Regards Andrew

14 years

2
1
0 0

Desiogns/Plans/Board Layouts for 6809 System

by wrm＠retro.co.za

> >Well we have had all the fun with 68K designs, but I would really like >to build a 6809 system. Any one know of a source for boards for a >simple system with say Serial Port and Parallel Port and memory? Buy a color computer or a dragon. It's pretty much a clone of the appnote. Otherwise, try Frank Wilson's design via http://koti.mbnet.fi/~atjs/mc6809/ (Because my design never worked right :-) W

14 years

1
0
0 0

Desiogns/Plans/Board Layouts for 6809 System

by wrm＠dW.co.za

> >Well we have had all the fun with 68K designs, but I would really like >to build a 6809 system. Any one know of a source for boards for a >simple system with say Serial Port and Parallel Port and memory? Buy a color computer or a dragon. It's pretty much a clone of the appnote. Otherwise, try Frank Wilson's design via http://koti.mbnet.fi/~atjs/mc6809/ (Because my design never worked right :-) W

14 years

1
0
0 0

Shameless parts trafficking! part2

by ittybittybytes＠gmail.com

More shed cleaning. Unibus boards plus pdp11/23 and an complete pro350 seller tcp1022 (me). As always mention to me your a list member and I'll throw in a goodie or two. cheers tom

14 years

2
2
0 0

cctech Digest, Vol 106, Issue 31

by michael.99.thompson＠gmail.com

> From:?Ola Hughson <f.helyanvy at gmail.com> > Date:?Tue, 19 Jun 2012 00:57:56 +0200 > Subject:?Re: looking for Apollo systems and parts, and to interface w/other Apollo groupies > Funny, because having an Apollo workstation is on my wishlist ;) > http://ola.earfolds.com/computers/ > > -- > Ola Hughson There is a bunch of Apollo equipment at the Rhode Island Computer Museum. You should visit, inventory it, and see what it will take to get some of it running. -- Michael Thompson

14 years

2
1
0 0

Top posting (was: Re: utterly free Machine Language for the Commie 64, 128, ...)

by dm561＠torfree.net

----- Original Message: Date: Tue, 19 Jun 2012 22:26:36 -0400 (EDT) From: Mouse <mouse at Rodents-Montreal.ORG> >> Top posting has pretty much been the norm since at least the mid 90s > Not here. Nor anywhere else I hang out. > Nor, given the arrogance and rudeness it exhibits, anywhere I'd want to > hang out. ----- Reply: ROFL! Precious irony; was it intentional? The only arrogance and rudeness I see in all this is from you and others arrogantly telling people how they must write and rudely denigrating and insulting anyone with a different opinion, while wasting everyone's time and bandwidth with your inane posts. If Jay wants to make and enforce such a rule, fine; your opinion doesn't interest me. I notice that none of you brave champions of the ancient Usenet traditions had the courtesy to change the subject line, a far more serious 'crime' than top-posting IMO as it forces the rest of us to wade through your posts on the remote chance that one of you actually had something relevant to contribute. I also notice that probably around 10-20% or so of the *useful* posts here are usually top-posted, but since they are from 'regulars' like Andrew, Dan, etc. they don't merit your censure; apparently that's only for relative newcomers? And FWIW, other than in places like this with its focus on the old and venerable ways, I also find top posting the norm 'out there', and far more efficient than every time having to wade again through text I've already read or written before, looking for the reply; I'm relieved that I won't encounter you in any of those venues. m

14 years

1
0
0 0

Load Testing PDP11 Power Supplies

by jaquinn2001＠gmail.com

I am making progress testing the power supply for my 11/04 (BA11-K chassis) and so far have worked through the power control box, transformer, fans and the 15VDC regulator/Power Line monitor but have one question for the group.... I am seeing in tolerance output voltages from the 15VDC regulator but I haven't loaded tested it. Is this something I should do or if the unloaded outputs are within tolerance then it is safe to use (once the other regulators are done)? No real technical info but a description of progress so far on http://www.quicktrip.co.nz/jaqblog for those interested in a few pictures. I am about the start on the H744 5VDC regulators. Regards Andrew

14 years

4
5
0 0

Found: paper tape for "L8/9" computer ... unknown computer

by ss＠allegro.com

hi, I found a box of paper tape software for an unknown computer (possibly a "L8" or "L8/9"?) ... and it's looking for a home (cost of mailing): The box is 8" by 8" by 1", with about 10 rolls of punched paper tape of various roll size. If anyone can suggest what computer it's from, I'm curious! Box has a lot of writing on it: ----- front: L8/9 FIRMWARES FOR SALESMEN NOTE THIS IS A MASTER TAPE AND IS NOT TO BE CUT UP! THE BOSS ---- back: Contains: 2 - 2170-003-24 PPT INPUT ADDON 2 - 2170-004-24 PPT OUTPUT ADDON 2 - 2180-029-030 MEM ALLOCATOR 2 - 2180-022-01 MMR MEM DUMP 2 - 2180-005-02 SL3 PPT DUMP 2 - 2180-012-02 SL3 PPT DUMP 2 - 2170-010-26 DATA HANDLING ADD-ON 2 - 2180-006-02 PAPER TAPE READER LOAD 2 - 2100-001-28 L82 BASIC INTER. 2 - 2100-003-28 L86 BASIC INTER. 2 - 2100-004-28 L9 BASIC INTER. ...and about 20 more items. Stan

14 years

1
0
0 0

Synchronous Modem Eliminators

by ethan.dicks＠gmail.com

Hi, All, I've been discussing 1980s and 1990s IBM gear with a list member via PM, and the need for modem eliminators has come up as a topic. I have worked with a variety of older Black Box units back in the days when I used Bisync comms every day, but looking around now, I see no EIA/RS-232 units for sale on eBay and other places - it's all V.35 (at multi-megabit speeds for CSU/DSU) and RS-422 and RS-530 (RS-422 on a DB25). 25 years ago, it was common to want to attach sync devices between 1200 and 56Kbps via RS-232 but not so much any more. It's not hard to make a Sync Modem Eliminator - in its simplest form, it's going to look at lot like an async null modem cable/box, but with active clocking (normally generated by the DCE) on pins 15 and 17 on both DB25s. There used to be a lot of baud rate generator chips, but for a small range of speeds, a properly-sized crystal on a 4060 clock/counter chip, perhaps a D-flip-flop used as a divide-by-2 (to square up the waveform and to shift which baud rate is "missing" because one stage of the 4060 chain is not brought out to a pin), and a 1488 to drive the clock to the DTE hardware. Where it starts to get complicated is that commercial RS-232 SMEs also had options to strap carrier detect and RTS/CTS, optional CTS turnaround delays and more. There were lots of jumpers and configuration often took some experimentation for a new set of devices. My question is, for those reading this that still use sync serial, is it "worth" designing and sharing a simple SME that might not have all the bells and whistles and user-configurable options, or is it "worth" just keeping the design very simple (3 chips plus a multi-voltage PSU, or multiple chips and a single-voltage PSU) and acknowledging that it will only work for 80% of the cases out there? It is, of course, easier to purchase than build, and there were once large quantities of the "right device", but I think as comms speeds have risen, not that many of these low-speed devices have survived, and certainly nobody is attempting to empty a warehouse of them at the moment. It's also entirely possible that the demand for synchronous serial comms over RS-232 lines is so small that the entire roster of interested parties would fit on a very short bus, so please chime in if you still use sync serial below 64kbps for anything. I'm curious to know who does and what devices they have. -ethan

14 years

3
4
0 0

Wanted: Original Kaypro 16 floppies

by FJGJR1＠aol.com

Post on the _www.vintage-computer.com_ (http://www.vintage-computer.com) site - that may be better & do a search for others who have posted on this topic. Good luck ! Frank In a message dated 6/18/2012 9:55:21 A.M. Eastern Daylight Time, james at slor.net writes: Thought I'd try one more time. Anyone? -----Original Message----- From: James [mailto:james at slor.net] Sent: Tuesday, June 05, 2012 12:41 PM To: cctalk at classiccmp.org Subject: Wanted: Original Kaypro 16 floppies I've been looking for an original floppy disk set for my Kaypro 16 (not 16/2 or any others) for a while now. Anyone on this list have a set to part with? Or, worst case, anyone have a set they could copy/image for me? Thanks! James

14 years

2
1
0 0

Nova 4 memory problems (was Re: Nova-4 / Eclipse S/120 power connector)

by iamcamiel＠gmail.com

On Mon, Jun 18, 2012 at 7:58 PM, Camiel Vanderhoeven <iamcamiel at gmail.com> wrote: > So, it looks like the memory chip that controls bit 10 for addresses > ending in 01 (binary) is at fault here. I'm going to do some wire > tracing to find out which chip this might be... Did my wire tracing, came up with the following picture of the board (use a fixed-width font to view): +-----------------------------------------------------------+ | 15 14 bit 1 0 | | +u+ +u+ ................................. +u+ +u+ | | | | | | | | | | | | 0xxxx00 | | | | | | | | | | +-+ +-+ +-+ +-+ | | | | +u+ +u+ +u+ +u+ | | | | | | | | | | | | 1xxxx00 | | | | | | | | | | +-+ +-+ +-+ +-+ | | | | : : | | : : | | word : : | | : : | | : : | | | | +u+ +u+ +u+ +u+ | | | | | | | | | | | | 0xxxx11 | | | | | | | | | | +-+ +-+ +-+ +-+ | | | | +u+ +u+ +u+ +u+ | | | | | | | | | | | | 1xxxx11 | | | | | | | | | | +-+ +-+ ................................. +-+ +-+ | | | | | | | +-+ +---+ +-+ +-------------------------+ +-------------------------+ So at least I can now trace an error bit to a chip. However, I must have damaged something in the process (believe me, I've been careful), because for all addresses ending in xxxx10, the data reads back as 000000 now. I hooked up my logic analyzer, and found that data dis written to the memory chips in this row correctly. The data read from these chips is also correct. The data is then fed to a few 74153 4-to-1 MUXes. I checked the selection inputs to the MUXes, and these are wrong for row 2. Now I need to see where those inputs came from... To be continued... Camiel.

14 years

3
3
0 0

emulated linux/bsd motorola 68k system?

by brad＠heeltoe.com

> Subject: Re: emulated linux/bsd motorola 68k system? > From: Al Kossow <aek at bitsavers.org> > Date: Mon, June 18, 2012 10:33 am > To: cctalk at classiccmp.org, Brad Parker <brad at heeltoe.com> > > >> Anyone know of a working emulator for a Motorola 68K system that works > >> well enough to install either linux/bsd in? > > Brad Parker's version of the MIT Sun simulator may be able to boot BSD. The sun2/sun3 simulator (tme) should boot netbsd out of the box. http://people.csail.mit.edu/fredette/tme/ I have mods which will allow it boot early sun os version (sunos 2.0, 3.2 & 3.5). Everything works except the ethernet on 3.5 - I need to fix that. http://www.heeltoe.com/index.php?n=Retro.Sun2 (I miss my old sun-2 :-) The code is pretty dense but also pretty complete. The sun-2 is 68010 based. As I recall the sun-3 is 68020 based. I can't remember if there were any 68030 based sun's. -brad

14 years

6
7
0 0

Nova-4 / Eclipse S/120 power connector

by iamcamiel＠gmail.com

Hi Bruce, I think I found the memory problem: On Mon, Jun 18, 2012 at 7:07 PM, Bruce <Bruce at wild-hare.com> wrote: > I'm confused. ?The VC (Virtual Console) works okay when you hit the reset > button, but when the computer is powered on you do not get the > > OK > !000000 > ! > > indication? ?(...per Chapter 5, Computer Self-Test, page 23) Correct. On power on I only get an "O". VC does not respond at that point. Once I hit the reset button, I do get O000000 ! The VC then responds as expected. If I remove the memory board, the behavior is exactly the same, except that every memory address reads back as 177777 of course. Accumulators with and without memory board: without - 177777 125252 076000 000701 with - 127252 125252 076041 000701 This lead me to suspect that the memory at word 41 was incorrect. Memory locations 0 - 40 were 052525, 41, 45, 51 were 127252, 42 and up (except those with the lowest bits being 01) were 125252. So, it looks like the entire memory is written with 125252 (1010101010101010) first, then each word is first read, then written with 052525 (0101010101010101). Sure enough, when I wrote 125252 to word 41, it looked fine, but when I wrote 052525 to word 1, it changed word 41 to 127252! So, it looks like the memory chip that controls bit 10 for addresses ending in 01 (binary) is at fault here. I'm going to do some wire tracing to find out which chip this might be... > The part numbers (005-xxxxxx-yy) are important when trying to determine the > exact computer configuration as the same board may have different part > numbers depending upon what chips are stuff onto the board (i.e. memory > boards). ?If no 005 part number exists anywhere on the board the board > artwork 107-xxxxxx-yy number may be used in extreme situations. ?I do not > know of a 107 to 005 cross reference table but I could look at various > in-house boards if needed. Like I wrote, the CPU and Memory board only have part of the label left, it looks like the actual part numbers have carefully been clipped off. All that remains are the "E" numbers, which I presume are a serial number. The numbers on the boards themselves read: CPU: 10700094903/0 07 (last 07 is printed, rest of the number is copper) Mem: 10700081303/03 (entire number copper) > Also, the S/140, Nova 4/S, Nova 4/X could interchange boards (CPU and > memory), so this system might not be a "true" Nova 4 - Eclipse boards could > be used rather than Nova boards if a Field Engineering guy didn't have the > "correct" parts. ?Nova/Eclipse CPU boards could be interchanged if the four > (4) PROM "personality" chips were swapped. Could that be the reason the part numbers have been removed? Although I don't think it's likely; all the PROM chips are soldered on (no sockets), so swapping wouldn't be all that easy. Plus, the soldering on the PROM chips looks like it's untouched. There are a few other areas of the main board that do show evidence of repairs; the following parts seem to have been replaced at some point (with approx. board locations): - One of the IDM2901A bit slices has been replaced with an AM2901BDC @ AE11 - 74S241 @ X13 - 74LS38 @ E45 - 4 75451 drivers around E22 Thanks, Camiel.

14 years

2
1
0 0

C64 temporary PSU

by jules.richardson99＠gmail.com

Has anyone (probably!) hacked together a PSU for a C64 using a PC PSU? How close do the AC lines have to be to a 9V sine wave? I've got someone offering me an unknown-condition C64/1541/1702 which is missing its PSU (and possibly the cable between the drive and computer), so if I do bite I'd be looking to do a quick hack just to see how operational everything is before I go trying to find a genuine PSU from somewhere. TBH, I'm not sure what my options are for getting software onto disk, either - it's not clear whether the current owner has any media at all (I get the impression that they've just unearthed the machine in storage, but various bits that they once had have gone missing over the years). A quick google seems to suggest that there are ways and means though, given that I'd have a 1541 (if it works ;) cheers Jules

14 years

8
14
0 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb