[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: 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: 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: 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: 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: 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 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: 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: 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, Fred Cisin wrote: GCR stands for "group Coded Record" group coded "recording" ;-) Christian

[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, 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: 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: 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: 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: 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: 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: 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 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 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: 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 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: 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: 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: 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: 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: 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: 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] 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: 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: 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: 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: 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] 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: 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: 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: 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: 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: 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: 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: 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: 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] 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: 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] 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: 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: 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: 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] 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: 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] 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: 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: First Personal Computer

On Sat, 25 May 2024, Mike Katz wrote: Now that is an interesting refinement.  Limiting to 1800 VA, most likely eliminates almost anything vacuum tube based. The LGP-30 needs less power. Christian

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Fri, 24 May 2024, Bill Degnan wrote: With respect, I have studied the 1956 Royal McBee LGP-23 (and later -30) at What is an LGP-23? I know the LGP-21, the transistorised and slower successor of the LGP-30 which came out later. Christian

[cctalk] Re: First Personal Computer

On Sat, 25 May 2024, Chuck Guzis wrote: Offhand, if I were King of the World, I'd immediately eliminate from competition those computers that cannot be run from a US 120 volt 15 amp wall receptacle. The rationale being that anything that requires special power wiring cannot be "personal" I I

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Fri, 24 May 2024, ??? wrote: There was a 4004 based computer developed in 1972 that was released before the Micral called the Comstar 4. It's not very well known but it was written about in the ACM and the Computer History Museum has a copy of their sales manual Interesting system. But it

[cctalk] Re: ANITA ((was: Experience using an Altair 8800 ("Personal computer" from 70s)

On Sat, 25 May 2024, Rick Bensene wrote: ..and anyone who has restored one knows that the vast majority of the back-to-back selenium diode packages have to be replaced with something else as they no longer function properly. Ambient moisture kills Selenium as a semiconductor, and even though

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Sat, 25 May 2024, Dave Dunfield wrote: First S100 buss system Originally called "Roberts Buss" the Atair expansion buss was used by many systems that followed, and not wanting to use their competitors name, the buss became known as "S100" (presumably System buss with 100 pins) As a

[cctalk] Re: First Personal Computer

On Sat, 25 May 2024, Chuck Guzis wrote: Okay, I'll refine it for the international crowd. Anything that requires over 1800 VA to run isn't a "personal computer" That's about 8 amps for the 220 volt world. Why the limit of 8 amps? The standard fusing for a single-phase outlet here is 16 amps

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Fri, 24 May 2024, Sellam Abraham wrote: On Fri, May 24, 2024, 2:45?AM Christian Corti via cctalk < This would go back to the 50s or earlier. The LGP-30 and comparable machines are considered as personal computers, too. But was it called a "personal computer"? And wa

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Fri, 24 May 2024, Paul Koning wrote: selenium, which is a very marginal semiconductor. Speaking of which: some early computers tried to use selenium diodes as circuit elements (for gates), with rather limited success. The MC ARRA is an example. The Anita electronic desktop calculators

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Fri, 24 May 2024, CAREY SCHUG wrote: the LGP-30 was used by one person AT A TIME, but on different days used by different people, who might or might not know each other, by some arbitrary scheduling algorithm. The one I was familiar with was run by a tech or grad student, doing work not

[cctalk] Re: First Personal Computer

16amps where? In Europe? At least in Germany 16 amps is standard. The Schuko outlets and plugs are rated for this current. As an example, the fuse box in my appartment is splitting up the three input phases (63A each) from the main distribution panel to 3x 3 circuits/16A each. Christian

[cctalk] Re: Experience using an Altair 8800 ("Personal computer" from 70s)

On Thu, 23 May 2024, Chuck Guzis wrote: On 5/23/24 12:53, Dave Dunfield via cctalk wrote: First Personal Computer (long before IBM PC) This would go back to the 50s or earlier. The LGP-30 and comparable machines are considered as personal computers, too. First system Bill Gates wrote

[cctalk] Re: First Personal Computer

Corti via cctalk [mailto:cctalk@classiccmp.org] Sent: 27 May 2024 16:53 To: Don R. Cc: Christian Corti Subject: [cctalk] Re: First Personal Computer 16amps where? In Europe? At least in Germany 16 amps is standard. The Schuko outlets and plugs are rated for this current. As an example

[cctalk] Re: Pragmatically [was: Experience using an Altair 8800 ("Personal computer" from 70s)]

On Tue, 28 May 2024, Sellam Abraham wrote: if a computer is being purchased by a non-human, i.e. corporation, to be used to benefit the corporation, it is NOT a personal computer. So then, that excludes the IBM PC / XT etc... At that time they were mostly bought by corporations. Christian

[cctalk] Re: Pragmatically [was: Experience using an Altair 8800 ("Personal computer" from 70s)]

On Tue, 28 May 2024, CAREY SCHUG wrote: Unless at least 5% (see quibbling below) of new purchases were by private individuals, not required for their gainful employment, they are "single user computers", not "personal computers". "Personal" is how they are used, not how they could be used.

[cctalk] Re: Lunar Lander, bug

On Tue, 18 Jun 2024, Paul Koning wrote: Interesting that the "40 years of Lander" article doesn't mention the McDonald's in the GT40 version. A couple of the commenters refer to it; It doesn't mention all the other versions that were written, for example the LGP-30 version written in ACT-V

[cctalk] Re: SMECC museum status

On Wed, 26 Jun 2024, Fred Cisin wrote: Here is what was on the list: Subject: Re: Fwd: [GreenKeys] FW: [cca] Ed Sharpe, KF7RWW, SK Not a subject line that would get my attention on this list. Christian

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