[cctalk] Re: Double Density 3.5" Floppy Disks

On Tue, 30 Apr 2024, Mike Katz wrote: The HP9114A drive uses a modified Sony 3.5" floppy drive running at 600 RPM instead of the normal 300 RPM.  This is an extremely unusual configuration that is different from any PC/MAC/Commodore/Amiga situation. I am using normal HD floppies in those 600

[cctalk] Re: Double Density 3.5" Floppy Disks

On Tue, 30 Apr 2024, Mike Katz wrote: I have tried bulk erasing 1.44 MB disks and they still won't format in the HP9114A battery operated HP-IL Floppy Disk drive. Then I'd guess there is a problem with your drive; write-protect switch? Christian

[cctalk] Re: Bomar 901b My wife found in my stuff. Is this as scarce at it seems?s,?

On Tue, 16 Apr 2024, ED SHARPE wrote: Bomar 901b My wife  found  in my stuff. Is this as scarce  at it seems?s,? What does that mean in English? Christian

[cctalk] Re: Drum memory on pdp11's? Wikipedia thinks so....

On Mon, 15 Apr 2024, Douglas Taylor wrote: had just acquired and needed to learn about.  It was impressive, he said the 11/45 was missing the memory boards.  If he shows up here on the list please Not unusual; my 11/45 doesn't have memory boards (for the core system), too. Instead, there is a

[cctalk] Bitsavers Zuse scans

With great interest, I have seen that there are now scans for the Z23 (perhaps more coming soon :-) ). But I have to admit that I am so much disappointed of the quality. I mean, whoever scanned this all, did he have a single look at the output? I do this, for each of the many scans, may they be

[cctalk] Re: Two IBM 360's available in the UK

On Sat, 16 Mar 2024, Adam Bradley wrote: Some of you may remember that I (Adam) and another chap (Chris) rescued two IBM 360/20 systems out of an abandoned building in Nuremberg back in 2019 and brought them to the UK (our blog is here: https://www.ibm360.co.uk/). We have since basically found

[cctalk] Re: Paper tape in casettes...

On Tue, 27 Feb 2024, Dr. Erik Baigar wrote: I wonder whether anyone kows if someone else had the idea of putting paper/mylar tape into a casette for repeated use e.g. to load an OS or similar. The Diehl Dilector had cassettes with a paper tape loop. Christian

[cctalk] Re: Vmebus

On Tue, 30 Jan 2024, Alan Perry wrote: I was given a Sun 3/260 that had been sitting in an open barn for a decade. It is a 12-slot, 9U VME system. I got it running with its CPU board (25Mhz 68020) and a Sun 32M memory board (the 8M board it came with has a h/w issue). Our SUN 4/260 is still

[cctalk] Re: Can anyone (pref in USA) recover data from an old RK05 disk pack?

On Tue, 23 Jan 2024, Graham Toal wrote: On Tue, Jan 23, 2024 at 3:05?PM Wayne S wrote: Can?t the pack be read and copied on the system it?s currently on? It's not been near a computer since 1979. It's currently in Fred van Kempen's storage. And why send it to the US instead of finding

[cctalk] Re: Shugart 850/851 repair needed

On Sun, 14 Jan 2024, Tim Mann wrote: and hasn't been used much, but last time I tried it, it would no longer read any data from the back of a floppy, only from the front. I use it with a Catweasel and my cw2dmk software, so I was able to try a few experiments from the software side. What I see

[cctalk] IBM 5110 IMFs

Does anyone here has an actual IMF file (Internal Machine Fix) for the IBM 5110? Not the file called "IMF" on the Customer Support Functions disk/tape, but a real fix. File type should be 23. I am trying to figure out how the patch mechanism works. The IMF is supposed to be loaded with the

[cctalk] Re: VT100 Monitor Board

On Wed, 29 Nov 2023, 'General Discussion: On-Topic and Off-Topic Posts' wrote: I am working on the schematic and when it is done I will post it for information. However, I was wondering what you suggest for testing the What am I missing? Why don't you use the official schematics of the VT100

[cctalk] Re: Intel 4004(sp?)

Well, just to throw this into the conversation: Over this past summer, I was studying the SCAMP ( https://voidstar.blog/scamp-a-review-50-years-later/ ) In that collection I came across a very early printing of the PALM instruction set, with the cover page dated March 21, 1972 of the printing,

[cctalk] Re: Intel 4004(sp?)

On Wed, 22 Nov 2023, Fred Cisin wrote: An absurd argument: It could be argued that the 8085, rather than being designed from scratch was simply a modification of the 8080. Perhaps significant modifications, but nevertheless modifications, not redesign from scratch. 8080 and 8085 are

[cctalk] Re: Looking for NORTRONICS Read/Write head for IBM 5100/5110/5106 tape unit

On Wed, 25 Oct 2023, Mark Perullo wrote: halves". One half looks like an "upper and lower" for the two tracks, then next to that is a "vertical bar." I've never quite understood what that vertical bar is - I assume a WRITE portion of some sort?? The ones in the ebay listing don't have

[cctalk] Re: M7846 RX11 Unibus floppy controller board documentation?

On Wed, 18 Oct 2023, Tom Hunter wrote: I was unable to locate schematics and/or a maintenance manual for the Unibus M7846 RX11 floppy controller board. On our FTP server ;-) ftp://computermuseum.informatik.uni-stuttgart.de/dec/pdp11/RX11_EngineeringDrawings_13Jun1975.pdf Christian

[cctalk] Re: IBM 5100 discussion

On Mon, 16 Oct 2023, jim stephens wrote: On 10/16/23 04:14, Steve Lewis via cctalk wrote: I'm here (voidstar) ? I think at the time I wasn't aware of cctalk, or it wasn't working for me at the time. The fellow who did this got into a lot of trouble, as they also did the XT/370 and PC/370, and

[cctalk] IBM 5100 discussion

I have been pointed to the following discussion https://forum.vcfed.org/index.php?threads/ibm-5110-initial-info.1224000/page-2 There, voidstar78 was apparently trying to contact me. Since my mail addresses are all functional (noone else had any problem with them, be it my personal or our

[cctalk] Re: IBM 727 tape drive

On Wed, 20 Sep 2023, Van Snyder wrote: I wonder if Susan Vigor has 727s with her 7094? Probably not. That would be 729 drives (the transistorized successor of the 727). We now have the 727 here (a 727 model III, built in 1957). It is complete and in a very good shape. It only needs some

[cctalk] Re: IBM 727 tape drive

On Mon, 18 Sep 2023, Len Shustek wrote: Just a few weeks ago I donated to the Computer History Museum a set of 14 original IBM black binders of "Type 7xx" manuals from the 1950s, including the 727. That one is likely to be the same as what's on bitsavers, but since it's no longer in hand I

[cctalk] IBM 727 tape drive

Hello all, as it will be soon of importance to us, I am seeking for the systems engineering manual and drawings, well, everything about the IBM 727 tape drive (not the 729!). I especially need the module locations charts and the module schematics. I see that there is the CE manual on

[cctalk] Re: TI 960

On Tue, 5 Sep 2023, Tom Ivar Helbekkmo wrote: James B DiGriz via cctalk writes: Oh, I've always been interested in them, just that opportunity and means never converged when I wasn't distracted by other things, and then they became yesterday's news and hard to find. If yours turn up, I'm sure

[cctalk] Re: TI 960

I won't give up my hopes, but it seems that this system is practically extinct and that noone is really interested in it, although it was the start for the later 980/990 and 9900 series. Christian

[cctalk] Re: Silly question about S-100 and video monitors

On Fri, 1 Sep 2023, wrco...@wrcooke.net wrote: My favorite is Votrax (speech synthesizers) being a division of Federal Screw Works. We have one attached to our lab8/e :-) Christian

[cctalk] Re: Friden (was Silly question about S-100 and video monitors)

On Fri, 1 Sep 2023, Rick Bensene wrote: The machine was able to be implemented with so few transistors because the microcode word was quite wide, and was designed so that it was sequentially interpreted as the bits streamed out of the delay line, so not all that many flip flops were needed.

[cctalk] Re: Silly question about S-100 and video monitors

On Thu, 31 Aug 2023, Mike Katz wrote: Composite will 99.99% of the time be better than RF modulated due to the bandwidth of NTSC (American) Televisions.  The NTSC television standard was not what I would exactly call high tech or high resolution.  It was 525 scan lines interlaced at 30Hz

[cctalk] Re: TI 960

On Sun, 27 Aug 2023, Mark Linimon wrote: The 960B is the only computer I ever walked away from and said "I can't do this". This was mostly, but not entirely, due to the Silent 700 and its cassette tapes. It took 20 minutes to load the loader, and, then, if I got that right, 20 minutes to

[cctalk] TI 960

I guess not many have survived but I want to ask if someone/some place has software (papertapes, ...) for the Texas Instruments 960 minicomputers. We have a 960B but at the moment, it is pretty much useless. I could toggle in a small program, but would appreciate something like FORTRAN or an

[cctalk] Re: Apple 1

On Wed, 2 Aug 2023, Murray McCullough wrote: Classic computers have a value in our capitalist society. Take the Apple-1: Not necessarily. Something only gets a value if there is a demand or market. As I repeatedly see old classic systems scrapped because nobody wants them/has space to store

[cctalk] Re: SCAMP at 61 (IBM Scientific Computer And Modular Processor) was Re: SCAMP at 50 (IBM 5100)

On Sun, 30 Jul 2023, ste...@malikoff.com ste...@malikoff.com wrote: Here's a relic from IBM's first SCAMP, a large ring binder (16 rings!) from Hursley, early 1960s. Unfortunately no SCAMP diagrams inside but to this day it still contains drawings and paintings I did as a kid :) Either the

[cctalk] Re: Old Professional/350 software, any of this out there

On Fri, 28 Jul 2023, Hans-Ulrich Hölscher wrote: Is it possible that there is a Linux version of ImageDisk? I found a signature "IMD Linux 0.19" in the P/OS images from Yes, it's my own version that I wrote. It uses ioctl() for direct floppy access (not libdisk). I much prefer a command line

[cctalk] Re: Old Professional/350 software, any of this out there

On Thu, 27 Jul 2023, Paul Koning wrote: Agreed. The SIMH logic is that the container file addressing matches the addressing exposed at the interface between device and driver. In the RX50 case, that is "logical order" because the MSCP controllers work that way. Conversely, in XHomer it's

[cctalk] Re: Old Professional/350 software, any of this out there

On Wed, 26 Jul 2023, Chris Zach wrote: Starting to go through my boxes of POS stuff. I know of course that 3.2 is out there (minus the Pro/Communications option which has a bad disk in the distro) however are these disks out there now? Anything of interest on our archive site?

[cctalk] Re: ICL / Digico

On Mon, 24 Jul 2023, ED SHARPE wrote: On Mon, Jul 24, 2023 at 4:55 AM, KenUnix wrote: Thanks ED. Some quite amazing pictures. What pictures? Of the Digico system? What are you talking about? On Mon, Jul 24, 2023 at 3:16?AM ED SHARPE via cctalk wrote: Maybe checkout internet archive

[cctalk] ICL / Digico

So, I was trying to contact "Pete" at vintage-icl-computers.com several times during the last years. Obiously, the site and/or the person is dead, no reaction whatever. I'm hoping that someone on this list might be able to help me: I still have a Digico Micro 16V computer that, one day, I'd

[cctalk] Re: IBM 5120/5110-3 casual notes / 8" disks question

On Sat, 1 Jul 2023, Steve Lewis wrote: Ok, so I grabbed some DS/DD 3M 8" disks - I assume I can "MARK" them (reformat). But so far no luck. I never had disks on the 5110, so still learning about them on the 5120 - I assume they still need to be "MARK" just like the tapes are? You must

[cctalk] Re: Any RSX-11 fans able to identify file types?

On Wed, 28 Jun 2023, Bill Gunshannon wrote: Don't know the 8600.  Wasn't the RL02 on the 11/730 actually connected to a PDP-11 that functioned as a console?  Surely no version of VMS ever fit on a 10M disk, did it? The 730 does not have a PDP-11 as frontend. It uses the RB730 integrated disk

[cctalk] Re: VCF Southwest 2023 some highlights

On Mon, 26 Jun 2023, Mark Huffstutter wrote: I've never seen an HP-9830A that gorgeous, and with the Companion HP-9866A printer no less, wow! That setup was quite usual I think. We also have the 8" disk station from Infotek (alas, the interface module has been lost, I can't find it).

[cctalk] Re: Did Bill Gates Really Say That?

On Fri, 23 Jun 2023, Ken Seefried wrote: Didn't see anyone mention it, but one should recall that the whole memory space on the 8088/8086 was 1M, so a 'limit' (whatever kind) of 640K wasn't Well, it only has 20 address bits. But it can address much more memory because it has additional

[cctalk] Re: Floppy recovery

On Tue, 20 Jun 2023, Chuck Guzis wrote: the cookie to a clean jacket after cleaning. If it's oxide shedding, I use a couple of drops of cyclomethicone on each side. Is it essentially the same as silicone oil? Because cyclomethicone is just a category for three different cyclic siloxanes (D4,

[cctalk] Re: IBM 5120/5110-3 casual notes / 8" disks question

On Sat, 17 Jun 2023, Steve Lewis wrote: My only question is: how "universal" are 8" disk? This 5120 only came with a single IBM 8" Diagnostics disk. It looks to be in fine condition, but I've no idea about the data. I can answer your question very quickly: A 5120 is exactly the same as a

[cctalk] Re: Source for NEW (unused) punch tape

On Fri, 9 Jun 2023, Paul Koning wrote: That may be true for some of them. But typesetting usage has 6 channels on tape sized to carry just 6. For example, the Linotype Yes, but if I'm remembering correctly, the width is the same. Only the typesetter tapes have the sprocket holes in the

[cctalk] Re: Source for NEW (unused) punch tape

On Thu, 8 Jun 2023, Chuck Guzis wrote: The 12-channel tape used on line printers (e.g. IBM 1403), was, IIRC, Mylar-coated. Much wider than regular 1" paper tape, however. All form control tapes I have are normal "paper" tapes. I have not seen such a mylar tape, yet. Christian

[cctalk] Re: Source for NEW (unused) punch tape

On Thu, 8 Jun 2023, Adrian Godwin wrote: Getting tape made to order might come in handy if you want odd sizes. 5 and 8 channel tape is fairly common, but there was also 6 and 7 channel tape (in widths specific to those types) which is far less common. I haven't seen 6 channel tape since the

[cctalk] Re: Rainbow H7842 PSU Fault

On Thu, 25 May 2023, Rob Jarratt wrote: I am thinking I may put it back together and test with a light bulb in series. SMPUs don't like that, and don't even try a variable transformers. Christian

[cctalk] Re: Rainbow H7842 PSU Fault

On Tue, 9 May 2023, Peter Coghlan wrote: Also, this device is a not just a straighforward transistor. It's data sheet says it is a package containing two transistors and some other components, That's a Darlington power transistor with freewheeling diode and biasing resistors for the second

[cctalk] Re: Low cost logic analyzer

On Tue, 14 Mar 2023, Steve Lewis wrote: I'm probing two DB25 connectors on the old IBM 5110 to figure out how to programmatically jiggle some pins and get some serial IO going.I've This is easy since it is an I/O bus. The instructions are GETB, PUTB, STAT and CTRL. In any case the

[cctalk] Re: IBM PS/2 Model 80 (8580-071) restoration

On Thu, 9 Mar 2023, John Maxwell wrote: Nowhere do I see any mention of a Model 80 Reference Disk. If you don't have one of these, you will not be able to configure the machine. I _should_ have a copy of one lying around (or already imaged/archived) - https://ardent-tool.com/disks/

[cctalk] Re: Need a 1.2mb 5.25 floppy

On Mon, 27 Feb 2023, Warner Losh wrote: You should be using QD floppies, but those are rare. DD floppies from later than 1985 though work just fine (discovered empirically while a Are they? I guess that I have at least as many QD floppies as DD, if not even more. :-) However, in a PC, to

[cctalk] Re: SDF had put a PDP-10 on the Internet

On Sat, 11 Feb 2023, Tarek Hoteit wrote: Ok let me answer that about sdf.org. I joined as a member last year. What I am saying below is what I learned along the way. It is a [...] Thank you for your insight information, I really appreciate it :-) Christian

[cctalk] Re: SDF had put a PDP-10 on the Internet

On Fri, 10 Feb 2023, Mark Huffstutter wrote: Well, I don't know what to tell you. I am looking at the sdf.org page right now, and When I click on the welcome tab at the top of the page I see the same message I did When I posted the first email. Maybe it's a local problem. Ok, the site seems

[cctalk] Re: SDF had put a PDP-10 on the Internet

On Thu, 9 Feb 2023, Mark Huffstutter wrote: Short story on the welcome page. There's no welcome page, sdf.org is down. Christian

[cctalk] Re: SDF had put a PDP-10 on the Internet

On Wed, 8 Feb 2023, Zane Healy wrote: Specifically it looks like a SC-40. https://twitter.com/sdf_pubnix/status/1623127551542702080 Interesting, but not really a beauty ;-) And BTW, who is SDF? They don't tell it on their site.

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

On Wed, 1 Feb 2023, skogkatt...@yahoo.com wrote: You stop being rude you big burly baby. Get a life. I'm not your hobby, as hard as you're trying to make me so. *PLONK*

[cctalk] Re: Media longevity (Was: Computer Museum uses GreaseWeazle

On Tue, 31 Jan 2023, skogkatt...@yahoo.com wrote: Grumpy Ol' Fred ci...@xenosoft.com C: I'm all ears. That is the best example of how *not to quote* ! Christian

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

is superseded with the author, like this: On Tuesday, January 31, 2023, 06:30:18 AM EST, Liam Proven via cctalk wrote: On Wed, 25 Jan 2023 at 08:09, Christian Corti via cctalk wrote: [...] You see? All good mail clients will do this automatically. Christian

[cctalk] Re: QIC tension band replacement

On Sun, 29 Jan 2023, BogDan Vatra wrote: Can someone recommend a place where I can buy tension bands for QIC(-150) tapes? I known about the boiling trick, sadly I don't have any original bands to boil ?. My boiling trick doesn't work very reliably anyways, as the belts mostly become also

[cctalk] Re: Excellent CHM Article on Apple Lisa Software (Apple Archive)

On Thu, 26 Jan 2023, skogkatt...@yahoo.com wrote: Companies don't care about history.  It does not affect the next quarter's sales. I had serial number 1 of a Radio Shack shortwave receiver and offered it to them. I got a reply back, 'I'm sorry, we no longer support that model.' cheers, Nigel

[cctalk] Re: Restoring floppy disk images to their rightful media

On Tue, 24 Jan 2023, Bill Gunshannon wrote: I know people seemed kind of turned off by the idea of GOTEK floppy disk emulators, but you do realize if you actually have the machine you are wanting to make disks for the GOTEK is a great way to do it.  Put a GOTEK and a real drive on the machine

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

Chris, can you *please* correctly indent and cite messages you are referring to? I am getting annoyed by guessing what part is from whom. Christian On Tue, 24 Jan 2023, skogkatt...@yahoo.com wrote: On Monday, January 23, 2023, 09:58:07 PM EST, Fred Cisin via cctalk wrote: sorry, never had

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

On Mon, 23 Jan 2023, Don R wrote: From NYT website: You?ve reached your limit of free articles. Purchase a subscription yadda-yadda Delete your cookies and web site caches ;-) (hint: install "Cookie Autodelete" browser add on) Christian

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

On Mon, 23 Jan 2023, Mike Stein wrote: I think the issue of finding media tends to be a little overstated. I offered some 8" diskettes a while back and didn't have a single inquiry, and there doesn't seem to be a real shortage of other sizes either if you don't mind sorting through used ones;

[cctalk] Re: Computer of Thesus (was: Re: Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man)

On Mon, 23 Jan 2023, Chris Zach wrote: Is it a valid repair? Yes. Is it not "100% original" nope, and I don't care too much. However one of the supplies was a total wreck from someone else Replacing a failed and possibly unrepairable component is something different than changing working

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Sat, 21 Jan 2023, dave.g4...@gmail.com wrote: It depends. 1.2Mb drives write a narrower track so if you put in a 360 or 640 disk in that?s already been written and write to it, then That's not correct, the "640" disk would also be 96tpi, so you can read and write it without issues in a

[cctalk] Re: Rejected messages

On Sat, 21 Jan 2023, Tony Jones wrote: No but I wish the list was configured differently so From: was the actual sender with a Reply-To of the list. Plus of course ListId: Right now From: is "sender name via cc talk" which isn't unique since some people just have a first name. Plus a Cc:

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Sat, 21 Jan 2023, Bill Gunshannon wrote: Later today I plan to try FlashFloppy. My goal is to eventually replace all of my mechanical floppies with solid state ones. Why would one want to do that? My goal would be the opposite. Upgrade all vintage computers with floppy drives ;-) My

[cctalk] Re: USB Attached 5.25" drives?

On Fri, 20 Jan 2023, Mike Katz wrote: Using the Greaseweazel is a two stage process.  The GW itself connects to the actual drive and just records the flux transitions as a series of zeros and ones.  This is transferred to a computer (PC, MAC, Linux) where the captured Even that is not fully

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Fri, 20 Jan 2023, skogkatt...@yahoo.com wrote: So ... can the GW be physically installed on a machine that doesn't have usb capability. But have the data stream analyzed (on the fly) by a different computer via it's usb capability? Ehm, did you even read the documentation or looked at the

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Thu, 19 Jan 2023, Fred Cisin wrote: I would recommend 5170 (AT), to also have the 500K bps data transfer rate of its FDC. I just had a good laugh ;-) Newer PCs often have unnecessary complications. Many no longer even support floppies! Since when does the Weazle need a floppy

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Thu, 19 Jan 2023, Jim Brain wrote: GW can do the same, but can also handle GCR encoded disks, the Amiga disks noted above, and it might be able to do older Apple Mac 720K disks All these Weazle thingies are just pulse timing samplers plus floppy drive controllers. The interpretation of the

[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

On Thu, 19 Jan 2023, r...@syssrc.com wrote: [... blob of text ...] It had been written on a DEC PDP-11 minicomputer using the RSX-11 Operating System. Although the museum has a PDP-11 in its collection, it had not yet been restored and could not be started. Brendan Becker, [...] Brendan set

[cctalk] Re: Disk pack production tools

On Thu, 19 Jan 2023, David Gesswein wrote: Originally discussing RK05 head position sensor bulb. I have replaced it. The offical part to replace it isn't available. You can open it up and put in a new bulb. I wasn't able to quickly find what bulb I used a number of years ago but if someone

[cctalk] Re: Altos 486 (was: Altos 386 series 1000 installation disks & tape)

On Mon, 2 Jan 2023, BogDan Vatra wrote: According to https://techmonitor.ai/technology/altos_claims_tripled_performance_for_its_new_486_1000_unix_machine the 486 should work with SCO as well. This means you're lucky as you can find it on the net (e.g. archive.org or

[cctalk] Altos 486 (was: Altos 386 series 1000 installation disks & tape)

On Sun, 1 Jan 2023, BogDan Vatra wrote: Earlier this December I got an Altos 386 series 1000 with lots of documentation and some installation floppy disks and one tape. I must say that it's an amazing machine! I'd like to reinstall the os but I have two problems: I have an Altos 486 System

[cctalk] Re: How to print old files.

On Sat, 31 Dec 2022, ben wrote: How do you print old files in ASCII 63 to modern devices, so you keep the ? and ? 's and not printing _ and ^ ? I'm scratching my head... you want to keep the question marks? But I guess you mean the back arrow and the up arrow. Christian

[cctalk] Re: Replacing NiCd with NiMH in a pro way.

On Fri, 23 Dec 2022, gordon+cct...@drogon.net wrote: dumb charger. Might be worth a watch, but the tl;dr seems to be that trickle ^ The what ??? Christian

[cctalk] Re: Pertec controller; was: anybody need 1/2" tape drives?

On Sun, 27 Nov 2022, Chuck Guzis wrote: If anyone cares, I've been working on a Pertec tape controller design. The initial version worked remarkably well with only a few bodge wires. I'm assembling the respin of the design and do not anticipate any issues. I could really use some "Unformatted

[cctalk] Re: Any working Datapoint 2200 systems?

On Mon, 14 Nov 2022, jos wrote: if anyone wants to go ahead I will gladly share my Kicad project ! Mind you, the diddlescan is a problem as that requires a CRT yoke with 3 windings Reminds me of the Cogar C4/ICL 1500 system that has a rotated deflection also with diddlescan ;-) But I

[cctalk] Re: Inline Serial Device?

On Sat, 12 Nov 2022, Peter Corlett wrote: Farnell Nederland is quoting me ?1.06 (+21% VAT) for the cheapest brand of A quick search reveals that a single NE555 costs 0.25 Euros at Reichelt, *including* VAT. I'm sure they can be had much much cheaper in quantities. Christian

[cctalk] Re: CoreNET PC-51 info (IBM 5110)

On Wed, 9 Nov 2022, Steve Lewis wrote: translating those results to "display character codes." I don't think the 5110 has a clock on its own, so you'd have to carefully time things? (like doing audio on an original Apple 2 with no RTC module). Sure it has. The ASync card does not have an

[cctalk] Re: CoreNET PC-51 info (IBM 5110)

On Wed, 9 Nov 2022, Steve Lewis wrote: always imagined it would be possible to "bit bang" across these external IO pins with some PALM-assembly -- the machine should be fast enough to encode 7-bit ASCII at 300 baud across those pins, maybe 1200. I'm not sure if The PALM and thus the 51[012]0

[cctalk] Re: Disk imaging n00b

On Thu, 3 Nov 2022, Grant Taylor wrote: GCR is Group Code Recording, used on the Apple II, Commodore 1541 drive and Amiga (and others) use a different encoding scheme than the normal FM No, the Amiga can handle GCR, but never used it. It's plain standard MFM with different sector layout and

[cctalk] Re: Disk imaging n00b

On Thu, 3 Nov 2022, Fred Cisin wrote: GCR stands for "group Coded Record" group coded "recording" ;-) Christian

[cctalk] Re: Disk imaging n00b

On Thu, 3 Nov 2022, Fred Cisin wrote: On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote: Please expand "GCR". Sure, . . . (GROSSLY OVER-SIMPLIFIED, such as "pulse" instead of flux transition) FM is "frequency modulated". Well, it is actually a regular clock pulse, [...] MFM is "Modified

[cctalk] Re: Disk imaging n00b

On Thu, 3 Nov 2022, Grant Taylor wrote: Does anyone have a 101 level boot strap guide for someone wanting to get into creating better-than-dd disk images? I'm finding myself back in a position where I want to image / preserve multiple 5¼ & 3½ inch disks. I think all of them are PC compatible

[cctalk] Re: 14 DZ11's for sale/whatever

On Tue, 1 Nov 2022, Ethan Dicks wrote: The big benefit for DH11 and DMF32 and 3rd-party DH11 work-alikes (Emulex CS-21...) is that since under normal workflow, many times more chars go out than come in so DMA-out saves a lot of overhead when blasting screens of stuff (like refreshing your page

[cctalk] Re: PALM assembler now available (5100/5110/5120)

On Thu, 27 Oct 2022, Steve Lewis wrote: Hehe, this sounds like a great idea! Did I send you my Kermit implementation or my Infocom V2 interpreter? Nope - would love to check them out, any PALM examples. Your annotated Ok, can you remind me next week perhaps? disassemble of the Executive

[cctalk] Re: PALM assembler now available (5100/5110/5120)

On Tue, 25 Oct 2022, Steve Lewis wrote: Christian! I tried contacting you a few months ago. Apologies, I suspect some intermediate ISP may be blocking gmail? I've seen this happen with other contacts. Oh my, yes I have some mail chaos on my system and I guess yours must have been "lost"

[cctalk] Re: PALM assembler now available (5100/5110/5120)

On Mon, 24 Oct 2022, Steve Lewis wrote: Wanted to pass along that PALM has been added as a target to the Macro Assembler AS. This means writing some assembly stuff for the old IBM 5100/5110/5120 systems. Assembler available here: http://john.ccac.rwth-aachen.de:8000/as/ Funny, as this is the

[cctalk] Re: Bendix G-15 Restoration

On Fri, 7 Oct 2022, Chuck Guzis wrote: I recall that the IBM 650 had an upgrade option where core was used for some of the registers. It was small--maybe 50 words. The Z22 had a very small area of core memory, called "fast memory" (Schnellspeicher). And then we have boards out of an LGP-21

[cctalk] Re: Bendix G-15 Restoration

On Sat, 8 Oct 2022, Paul Kimpel wrote: modify a lot of the software. Timing dependencies aside, G-15 instructions didn't have addresses -- they had "timing numbers" that effectively told the hardware how long to wait before reading or writing a word on the drum. Oh really, that is then

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

On Mon, 5 Sep 2022, jim stephens wrote: The unit I have is IBM. There was no floppy drive unit from IBM for the IBM 5100. Or do you have a model number? It only did single sided diskettes, low density.  It's the only device which The IBM 5114 handles single and double sided diskettes, as

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

On Mon, 5 Sep 2022, jim stephens wrote: the 5100 has an external connector.  The floppy drive is a floor unit about Yes, three Sub-D connectors. Two for the signals, one for power. the size of three AT units upright, with two single density floppies in it.  And that floppy drive (if you

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

On Mon, 5 Sep 2022, Tom Stepleton wrote: Or at least there as something that was sold in this way. Here is its brochure: http://www.bitsavers.org/pdf/sykes/brochures/Sykes_Comm-Stor_5100_Brochure.pdf Interesting! (What is an IMF?) IMF = internal machine fix The 5100/5110 had a mechanism

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

buy for 31000. ^ On Mon, 5 Sep 2022, Christian Corti via cctalk wrote: Are you sure about that? The 5100 doesn't support floppy drives. And I've never heard of third-party drives (that would need IMFs, too) for the 5100

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

On Sun, 4 Sep 2022, jim stephens wrote: On 9/3/22 17:38, Fred Cisin via cctalk wrote: Well, it ain't in the 5150/5160 range! The 5100 new was $10K to $20K. I had a 5100 that a dentist had bought as soon as it  came out and he added the floppy drives and printer.  It was a direct IBM buy for

[cctalk] Re: Flipping an 8" diskette

On Thu, 1 Sep 2022, jim stephens wrote: I've never heard of anyone making 8" Flippy Diskettes. BASF had the FlexyDisk 2N. They are intented for single-sided drives and can be flipped. They have two index hole cutouts. Christian

[cctalk] Re: Connecting a physical terminal via LAN to Serial Port

On Sun, 31 Jul 2022, Fritz Mueller wrote: +1 for the Digi Portserver for this application. I recently grabbed one off eBay, because I have a number of vintage terminals here which I would like to ?crossbar? to a number of vintage computers with serial terminal support, and also provide both

[cctalk] Re: Connecting a physical terminal via LAN to Serial Port

On Sat, 30 Jul 2022, Ali wrote: modern system using an IP:port schema. This works great except I don't get to play with my shiny, new to me, authentic experience terminal device. Why not? You attach the terminal to your terminal server, too, and connect from the terminal to one of the other

Re: Xerox 800 Word Processor 1974 promo film

On Sat, 2 Jul 2022, Grant Taylor wrote: I don't know that I've ever heard / seen the name "Rank" prefixing "Xerox" before. Actually I knew them only as Rank Xerox many years ago, when they were commonly known as office suppliers, e.g. photo copiers and printers. Christian

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