On Wed, Nov 6, 2024 at 5:21 PM dwight wrote:
>
> I'd think a diode, white LED and a resistor would make a good enough strobe.
> Maybe 2 resistors to isolate the AC lines enough a little better.
Quite likely. Actually the traditional mains lamp stroboscope flashes
twice per cycle, so you might wan
On Wed, Nov 6, 2024 at 4:31 PM Mike Stein via cctalk
wrote:
>
> I use a strobe disk glued to a fridge magnet that I stick on the spindle
> motor of 5 1/4" drives to confirm the speed; the trouble is that it's
> becoming difficult these days to find lamps that emit light at 60 Hz. ;-)
I made a sim
On Mon, Nov 4, 2024 at 4:06 AM Mychaela Falconia via cctalk
wrote:
>
> Paul Koning wrote:
>
> > 1. Show a one-word PDP-11 program that writes all of memory, in reverse
> > order.
>
> MOV -(PC),-(PC)
Does that work on all models of PDP11?
I had an idea that (as in C) the order of the decrements
On Mon, Nov 4, 2024 at 12:05 AM dwight via cctalk wrote:
>
> I/O addresses for the 8080 come to mind.
BASIC-09 under OS-9 (6809 processor) lets you execute a system call
from a BASIC program. The problem is that a system call is coded as a
software interrupt instruction followed by a byte giving
On Tue, Oct 29, 2024 at 7:10 PM Fred Cisin via cctalk
wrote:
> Because one couldn't supply drives with an asterisk?
> or because they didn't want to use the crappy Qume 142 drives on anything
> else?
> The Qume 142 was so slow stepping, that that was one of the reasons for
> introducing PC-DOS 2.
On Tue, Oct 29, 2024 at 7:10 PM Fred Cisin via cctalk
wrote:
> > I've never seen a 5.25" or smaller floppy drive with a mains
> > sychronous motor.
> Nor I. I don't recall ever seeing a 5.25", 3", 3.25", nor 3.5" that used
> anything other than 5VDC and/or 12VDC
Nor have I.
On the other hand t
On Tue, Oct 29, 2024 at 7:00 PM Fred Cisin wrote:
>
> >> 360K drives (40 track) have tracks 48 tpi. (Early on, Shugart SA400, and
> >
> On Tue, 29 Oct 2024, Tony Duell via cctalk wrote:
> > For the pedants, the IBM 360K format is 80 track. 40 cylinders, each
> >
On Mon, Oct 28, 2024 at 7:22 PM Fred Cisin via cctalk
wrote:
>
> Track width
> 360K drives (40 track) have tracks 48 tpi. (Early on, Shugart SA400, and
For the pedants, the IBM 360K format is 80 track. 40 cylinders, each
of 2 tracks, one on each side of the disk.
> Apple SA390, only used 35 of t
On Mon, Oct 28, 2024 at 6:45 PM Fred Cisin via cctalk
wrote:
> 2) motor speed is not as easy as increasing/decreasing voltage.
> On a belt driven drive, you might be able to change pulleys. Althoug, I
> think that a "50Hz" pulley on a "60Hz" drive might give you the change
> from 300 RPM to 360R
On Sun, Oct 27, 2024 at 5:15 PM jonesthechip--- via cctalk
wrote:
>
> As the venerable intellec microcomputers have reached their half-century, I'm
> interested in contacting other owners/collectors to try and obtain original
> assembler tapes (or their contents) to enable restoration of systems
On Wed, Oct 2, 2024 at 4:53 AM Bill Degnan via cctalk
wrote:
>
> What *do* people use to align a shugart drives?
I only ever try to align a drive using an 'catseye' alignment disk.
I have a little drive exerciser unit badged 'RS'[1] which will let me
move the head around to seek to the alignment
On Wed, Oct 2, 2024 at 5:25 AM Bill Degnan via cctalk
wrote:
>
> I assume it's not easy to copy alignment disks, but I guess I will find out.
It's impossible to create an alignment disk on a standard floppy
drive. It has eccntrically-recorded tracks for one thing
If you manage to get an original
Corrected the Subject: line...
On Mon, Sep 23, 2024 at 4:13 PM Glen Slick via cctalk
wrote:
>
> On Mon, Sep 23, 2024, 2:19 AM Tony Duell via cctalk
> wrote:
>
> > Is there are program available that will take an image of a CP/M disk
> > in .IMD format (say) and l
Is there are program available that will take an image of a CP/M disk
in .IMD format (say) and let me view the directory, extract or add
files and so on?
If so, what is recommended and where can I get it?
-tony
On Tue, Jul 23, 2024 at 1:53 AM Eric Smith via cctalk
wrote:
>
> On Sat, Jul 20, 2024 at 8:08 PM Steve Lewis via cctalk <
> cctalk@classiccmp.org> wrote:
>
> > What I meant was that in the title of the book they use "digital computer"
> > and I wonder if there was ever a book describing a mechanic
On Sun, Jul 21, 2024 at 3:08 AM Steve Lewis via cctalk
wrote:
> What I meant was that in the title of the book they use "digital computer"
> and I wonder if there was ever a book describing a mechanical "analog
> computer" - and what they might even look like.
There have been mechanical analogue
On Thu, Jun 6, 2024 at 5:10 AM Sellam Abraham via cctalk
wrote:
> The opposite of
> personal is multi-user. There is your dichotomy. It is either personal,
> or multiuser, and never the twain shall meet, and neither anything betwixt.
By that definition the TRS-80 Color Computer is not a persona
On Thu, Jun 6, 2024 at 1:38 PM Liam Proven via cctalk
wrote:
> If you buy a bus and start driving it yourself everywhere, for your
> own exclusive use, it doesn't somehow magically stop being a bus. It's
> still a bus, just a bus being used for personal transport.
I am not so sure...
After all
On Tue, May 28, 2024 at 6:06 PM ben wrote:
> Just what is a gas radio?
A radio that runs off gas rather than plugging into the electricity mains.
Let me explain. The main use for either gas or electriciy in UK homes
until the mid 1920s was heating (including cooking) and light. Both
energy sour
On Tue, May 28, 2024 at 5:56 PM ben via cctalk wrote:
> > --First Appartment I lived in had gas refrigerator/stove AND still had some
> > fixtures for gas lighting. washer/dryer/furnace/hot water were all shared
> > in basement, real screw in fuses (not safety) so MAYBE had 220 if you used
>
On Mon, May 27, 2024 at 1:40 AM Rick Bensene via cctalk
wrote:
>
> Mike Katz wrote:
>
> > I'm sorry but you are misinformed about the HP-41C Calculator.
>
> > The HP-41 was the first calculator that had Alpha-Numerics.
>
> That is not true.
>
> Technically, out of the box, it was the HP 9830. Yes
On Sun, May 19, 2024 at 4:56 PM Tarek Hoteit via cctalk
wrote:
>
> Thank you, Josh. How did your passion start with classical computers? Maybe
> this helps in understanding the generation?
I know how I got started, but not really why. Although I can explain
how it progressed.
It was May 1986, I
On Sun, May 19, 2024 at 1:08 PM Will Cooke via cctalk
wrote:
> Does anyone know of a small TV tuner that tunes old analog TV channels (US
> NTSC) and outputs composite or VGA or HDMI signals? I've looked around a bit
> but haven't found anything. It's relatively easy to build one, but I would
On Thu, May 9, 2024 at 1:08 PM Bill Degnan via cctalk
wrote:
>
> I meant UCSD not native Pascal. I assume the SAGE was popular with those
> who bought them, but relative to the PC, quite obscure of a computer. Most
> people today have little knowledge of the SAGE II / IV. How many even
> exist
On Wed, May 8, 2024 at 3:25 PM Harald Arnesen via cctalk
wrote:
>
> Paul Koning via cctalk [07/05/2024 19.31]:
>
> > (Then again, I had a classmate who was taking a double major: math and
> > music composition...)
>
> Mathemathics and music is not a rare combination - see Tom Lehrer, for
> instan
On Wed, May 8, 2024 at 12:51 AM Chuck Guzis via cctalk
wrote:
>
> On 5/7/24 15:21, Fred Cisin via cctalk wrote:
> > How difficult is it to measure and compare "With/Without" signals?
> >
>
> If you peruse the old Bob Pease articles on "Electronic Design"
> magazine, I believe more than once, he al
On Wed, May 1, 2024 at 5:38 AM Paul Berger via cctalk
wrote:
>
> As Mike said there are two models 9114A and 9114B, they are functionally
> equivalent, however the B model uses a 1/2 high drive mechanism and I
> believe there are changes to the controller as well, but I have only
> seen the inside
On Sat, Apr 13, 2024 at 10:48 PM Jon Elson via cctalk
wrote:
> Yes, there were a number of Versatec models for different
> paper sizes and pixel density.
Does anyone else have one in their collection?
I have an ICL-badged V80 which has a GPIB interface to link it to a
PERQ. I also have the sche
On Thu, Apr 4, 2024 at 1:48 AM Sellam Abraham via cctalk
wrote:
[Sent privately]
>
> Has anyone communicated with or know a way to communicate with Joe Rigdon
> out of Florida? Most here should know him as an old-school ClassicCmp
> veteran.
I have just heard that he attended the HP Handhelds
On Sat, Apr 6, 2024 at 3:54 PM Douglas Taylor via cctalk
wrote:
>
> The DEC VT340 has a slot in the back of the terminal to insert a ROM
> cartridge. I can't find any description of what this DEC labeled ROM
> cartridge would do for you. I've seen them with V1.1 and V2.1 markings,
> does anyone
On Fri, Apr 5, 2024 at 1:33 PM Tony Duell wrote:
>
> On Thu, Apr 4, 2024 at 8:58 PM Zane Healy via cctalk
> wrote:
>
> > Have you checked with Eric Smith or Dave McGuire? I want to say that Dave
> > was in the same general area as Joe when he lived in Florida.
>
> I've asked Wlodek Mier-J of th
On Thu, Apr 4, 2024 at 8:58 PM Zane Healy via cctalk
wrote:
> Have you checked with Eric Smith or Dave McGuire? I want to say that Dave
> was in the same general area as Joe when he lived in Florida.
I've asked Wlodek Mier-J of the British HPCC calculator club if he has
any contact details.
-
On Sun, Mar 17, 2024 at 3:38 PM Adrian Godwin via cctalk
wrote:
>
> HP at least sometimes used staff.
There's one HP publicity photo I remember that I surely hope was staged.
It's for the HP9880 hard disk system for the HP9830 calculator. The
disk drive is an HP7900, a fixed/removeable platter d
On Wed, Feb 21, 2024 at 9:39 AM Stefan Skoglund via cctalk
wrote:
>
> Liam, TriPOS ?
>
> If i'm not wrong it was a OS developed in Cambridge (Cambridgeshire).
It was. The name came from the fact that a course at Cambridge
University is called a Tripos. Originally written by Martin Richards
(as in
On Fri, Dec 1, 2023 at 4:22 AM Chuck Guzis via cctalk
wrote:
>
> On 11/30/23 15:46, Van Snyder via cctalk wrote:
> > I was given a 22-inch Viewsonic monitor. The label had been scratched
> > off. It has four switchesd below the screen, labeled 1, 2, an up arrow,
> > and a down arrow.
> >
> > When
On Wed, Nov 29, 2023 at 6:16 PM Rob Jarratt 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 board
> once I have done this. Simply replacing the blown fuse and plugging it in
> doesn't sound l
On Sat, Nov 25, 2023 at 11:12 PM Rob Jarratt
wrote:
> > Have you checked the diodes and capacitors associated with the flyback
> > transformer? If something is shorted there. it's the equivaent of running a
> > power supply into a short circuit. The input current will go up.
>
> I have checked al
On Sat, Nov 25, 2023 at 12:07 PM Rob Jarratt via cctalk
wrote:
>
> Hello,
>
>
>
> As some may recall I have been working on getting a VT100 going again. I
> have made good progress and I think the main board is probably OK now (see
> here if you are interested:
> https://robs-old-computers.com/202
On Sun, Oct 1, 2023 at 8:38 AM Wouter de Waal via cctalk
wrote:
>
> Hi all
>
> I re-discovered some eurocards I found in a box at a swapmeet long ago.
>
> It looks like a complete 8085 system. Lots of RAM, 2K EPROM, I/O, FDC.
>
> The strange thing is that the EPROM is mapped at F800, the code in t
On Fri, Sep 1, 2023 at 6:29 PM Rick Bensene via cctalk
wrote:
>
> Tony wrote:
>
> > Didn't Singer own Friden (or at least the name) at one point? I am sure
> > I've seen calculators
> > batched(sic) 'Singer Friden').
> Singer effectively began the death of internal electronic calculator
> devel
On Fri, Sep 1, 2023 at 4:51 PM dwight via cctalk wrote:
>
> My first computer was a Poly-88. I had no monitor and no keyboard.
> I read and understood the instructions about finding a TV that used a
> transformer power supply. Many newer TV's of that day were not using a
> transformer for the ma
On Fri, Sep 1, 2023 at 4:31 PM dwight via cctalk wrote:
>
> I do understand the warranty sticker. Say we have the average computer buyer.
> He has a screw driver and mostly knows how to use it. He also went to Radio
> Shack ( long gone 🙁 ) and bought a cheap soldering iron. He is now fully
> eq
On Thu, Aug 31, 2023 at 9:53 PM Chris Zach via cctalk
wrote:
>
> Which is weird, since Radio Shack was renowned for putting schematic
> diagrams on so many of their products. My Flavoradio still has the
> schematic on it if a transistor goes bad
And they would sell spare parts and service ma
On Thu, Aug 31, 2023 at 7:49 PM Fred Cisin via cctalk
wrote:
> On Thu, 31 Aug 2023, geneb via cctalk wrote:
> > Fun fact - the "Warranty Void if Removed" tags were and are illegal. The
> > warranty can only be voided if the mfgr can prove the thing you did resulted
> > in the problem you're clai
On Sun, Aug 13, 2023 at 5:20 PM Nigel Johnson Ham via cctalk
wrote:
> The DEC Rainbow RX50s only have one motor :-)
{being pedantic}
No they don't. They have 2. A permanent-magnet DC motor used to drive
both spindles and a stepper motor used to position both heads.
But I will agree it is a lot
On Sat, Aug 12, 2023 at 4:36 AM Chuck Guzis via cctalk
wrote:
>
> On 8/11/23 16:08, Fred Cisin via cctalk wrote:
> >
> > Or, is it correct to refer to anything between DA and DB as "DB"??
> > (such as "DB-23" on Amiga? Yes, I dremeled a DB25 to fit.)
>
> Atari ST also used strange shell/pin coun
On Tue, Jun 27, 2023 at 12:35 AM Mark Huffstutter via cctalk
wrote:
> I've never seen an HP-9830A that gorgeous, and with the
> Companion HP-9866A printer no less, wow!
What I'd like to see is an HP9830 with the HP9880 disk system (an
HP7900A drive with a special controller). Any still w
On Wed, Jun 28, 2023 at 5:02 PM Chris Zach via cctalk
wrote:
> Yup, it's a DEC thing, however the DEQNA cab kits do the proper cam and
> lock interface. I thought about removing the nuts, but went with
> ordering a cable and I'll pull the studs off it to make it work. Sub
> optimal but that is DE
On Wed, Jun 28, 2023 at 2:44 PM Jonathan Chapman via cctalk
wrote:
>
> > For a few inches, which would be enough here I think, I've used an IDC
> > DA15 plug and socket crimped onto the normal ribbon cable. Technically
> > it's wrong but the reflections on that length of cable won't matter.
>
> Th
On Wed, Jun 28, 2023 at 6:00 AM Grant Taylor via cctalk
wrote:
>
> Tony's email makes me ask more questions than I have (smart alack)
> answers to. Maybe ~> hopefully I can ~> will learn something.
I was being a bit of a smart alec too. The point I was making is that
a bit of normal IDC ribbon c
On Wed, Jun 28, 2023 at 6:13 AM Fred Cisin via cctalk
wrote:
> With many boxes of used cables, often there will be cables that are DB-25,
> but with 16 pins missing in the 25 pin connector, often leaving pins 1-8
> and 20, and gaps where other pins could have been.. I call THAT a DB-9
>
The DE9
On Wed, Jun 28, 2023 at 1:19 PM Paul Koning via cctalk
wrote:
>
>
>
> > On Jun 28, 2023, at 1:13 AM, Fred Cisin via cctalk
> > wrote:
> >
> > DA, DC, DE connectors are a different size D shell than the DB, which is
> > the one commonly used for a 25 pin cable.
>
> There is also DD, though I've
On Wed, Jun 28, 2023 at 2:17 AM Chris Zach via cctalk
wrote:
>
> Anyone in MD got an AUI cable (few feet long) I can steal so I don't
> have to remove the bolts from the Pro/380's Ethernet socket or the pins
> on my 10bt ethernet MAU?
For a few inches, which would be enough here I think, I've use
On Mon, Jun 26, 2023 at 3:38 PM Jan-Benedict Glaw via cctalk
wrote:
>
> Hi!
>
> As I'm preparing to setup my old hardware, I fetched two VAXstations
> (4000/90 and /96) from storage and cleaned one of them throughoutly.
>
> Then I gave power (to both of them), but both won't really start:
> all
On Mon, Jun 26, 2023 at 1:06 PM Steve Lewis via cctalk
wrote:
>
> VCF SW was this past weekend near Dallas, Texas.
>
> Here are some highlights from my perspective.
>
> https://voidstar.blog/vcf-southwest-2023/
>
>
> Most photos you can click to enlarge (Edge has bugs with WordPress, you may
> nee
On Sun, Jun 25, 2023 at 5:52 PM Rob Jarratt wrote:
>
> Before I confuse matters too much I should point out that I was not using the
> Rainbow power switch unit but one from a DECmate. I had erroneously thought
> there was a fault with the Rainbow one. I think the fan supply may be
> different
On Sun, Jun 25, 2023 at 5:33 PM Rob Jarratt wrote:
>
> Thanks Tony. I removed the mains bridge rectifier and found it measured short
> across two of its terminals, so I am ordering a replacement. I tested the
> PSU, without the mains bridge rectifier and without the diodes on the output
> of th
On Sun, Jun 25, 2023 at 1:36 PM Rob Jarratt via cctalk
wrote:
>
> Hello,
>
> It has taken me ages to get back to this, but I think I have hit an
> insurmountable problem.
>
> I reassembled the PSU after the PWM started working again and tested it with
> a dummy load and using two 100W light bulbs
On Sun, Jun 25, 2023 at 8:31 AM r.stricklin via cctalk
wrote:
>
>
> > On Jun 24, 2023, at 11:10 PM, Tony Duell via cctalk
> > wrote:
> >
> > And this is where I get lost..
> >
>
> I do not understand your overbearing attitude of helplessness toward
Still trying to make sense of this thing.
The problem is that one very important thing is missing. I refer to
DODUMENTATION. I don't fall for this modern rubbish that a product
with a thin manual is easy to use. No, the thicker the manual the
better. It will probablt answr my questions. But the Gr
>
> On Sun, 11 June 2023, 10:44 pm Tony Duell via cctalk,
> wrote:
>
> > > Fundamentally, it seems to me that they're all the same basic hardware,
> > > timing intervals between flux transitions.
> > >
> > > So other than the soaftware, what&#x
On Sun, Jun 11, 2023 at 9:07 PM Sellam Abraham via cctalk
wrote:
> "While I don’t recall saying that, I may well have - I know that I was
> involved in the engineering question of how safe it would be to use.
>
> The inverter produced 230 VDC, which it turned out could be safely fed to
> the 120V
On Mon, Jun 12, 2023 at 1:25 AM Chuck Guzis via cctalk
wrote:
>
> I'm a bit surprised that there don't seem to be any adaptations that
> hook into the head pre-amps and use an ADC to give a view of what the
> read signal actually looks like. Maybe that's asking too much--there
> are certainly MC
> Fundamentally, it seems to me that they're all the same basic hardware,
> timing intervals between flux transitions.
>
> So other than the soaftware, what's the difference?
I could make a stupid comment and ask 'what's the difference between a
PDP8, PDP11, PERQ or HP9830?'. Apart from having fin
Well, I've got the Greaseweazle software to run, but I don't know why,
which is hardly encouraging.
Installing various Windows updates, downloading .dlls, and puting the
latter in various directories changed the error messages but it never
actually worked. But downloading the latest Greaseweazle s
On Wed, Jun 7, 2023 at 1:36 AM John Floren via cctalk
wrote:
> Thanks, Bob, that would be very helpful! I think the biggest thing is
> figuring out how the pack was wired into the J4 header on the PSU... if
> you've got the manuals for the DC option, it might have schematics too.
Be very caref
On Tue, Jun 6, 2023 at 7:47 PM Paul Koning via cctalk
wrote:
> I'm reminded of a comment about the PDP-11 family:
>
> "A PDP-11/xx is compatible with a PDP-11/yy if and only if xx == yy".
That I suspect is actually false. The11/05 and 11/10 were the same
machine, ditto the11/35 and 11/40.
On Tue, Jun 6, 2023 at 3:42 AM John Floren via cctalk
wrote:
> It's funny that luggable power packs come up here as I'm trying to revive my
> Otrona Attache... The power supply does nothing on AC input, even after a
> recapping, so I thought I'd investigate the "DC Power Option" described in
>
On Sun, Jun 4, 2023 at 10:57 PM Fred Cisin via cctalk
wrote:
>
> On Sun, 4 Jun 2023, Rick Bensene via cctalk wrote:
> > an example of early "mobile computing". (Tongue firmly in cheek).
>
> The original Osborne 1 had a 12V power input!
Actually it's +12.6V and +5.6V and you have to supply both vo
On Tue, May 30, 2023 at 5:09 PM philip--- via cctalk
wrote:
>
> I wasn't trying to solve the whole problem at once!
>
> A lot of people have recommended "sneakernet" to connect your modern
That's an expression which always sounds odd to me. The footwear known
as 'sneakers' across the Pond is, I b
On Tue, May 30, 2023 at 12:22 PM Adrian Godwin via cctalk
wrote:
>
> There was an isolation transformer followed by a variac. The procedure was
> to slowly bring up the variac until the control circuit was functioning,
> check the waveforms around that, and then increase the supply voltage while
>
On Tue, May 30, 2023 at 11:33 AM Hans-Ulrich Hölscher via cctalk
wrote:
>
> What can/will go wrong in either case, and why?
The normally-given reason is that an SMPSU approximates to being a
constant power load and draws more current if the input voltage is
reduced. This can cause the chopper tra
On Sun, May 28, 2023 at 4:36 PM Chuck Guzis via cctalk
wrote:
> All of these flux-transition gizmos, whether or not they're the
> Applesauce, Greaseweazle, Catweasel, Fluxengine, Deviceside work
> exactly the same way. A counter free-runs, and every time there's
> change in direction of mag
On Sun, May 28, 2023 at 2:32 PM Adrian Godwin via cctalk
wrote:
>
> Tony,
>
> An instrument slightly more to your taste than a PC might a 16500b logic
> analyser. Perhaps you've already got one. I believe these can work with
> both LIF and MSDOS floppies and uses an IDE HDD (which can painlessly b
> I'm suprised to hear you're familliar with the GreaseWeasel but have
> never heard of BlueSCSI. ( https://scsi.blue/ ). Though SASI
> compatability seems "possible but not guaranteed", being an open source
> project, you can probably wangle the existing PCB's/software to be SASI
> compliant. More
On Sat, May 27, 2023 at 10:00 PM Alexander Schreiber via cctalk
wrote:
> Which is why among the more cynic^Wexperienced SREs (my line of work)
> we sometimes use the term "Working As Implemented" when the code behaves
> exactly as written (and ofteni as specified), but still does the wrong
> thin
On Sat, May 27, 2023 at 8:47 PM philip--- via cctalk
wrote:
>
>
> > USB interfacing is hard, but SD cards are a lot simpler. So use a card
> > reader thing to transfer the files to an SD card and design an
> > interface for that to ISA bus.
>
> Thinking of that, I had actually wondered whether one
> Would it be possible to build a small computer, 8088/8086
> just for this?
>
I don't see why not, but given the choice I'd pick just about any
other processor family. Probably a 68000.
-tony
On Thu, May 25, 2023 at 1:54 AM Mike Stein via cctalk
wrote:
>
> I realize he's a bit eccentric, (even more so than many of us ;-) ), but I
I am not 'a bit eccentric'. There is absolutely nothing mild about my
eccentricities!
> But it sounds like he'll explore one of the flux-transition gizmos;
On Wed, May 24, 2023 at 10:54 AM emanuel stiebler wrote:
>
> On 2023-05-24 05:26, Tony Duell via cctalk wrote:
> > On Wed, May 17, 2023 at 5:29 AM Fred Cisin via cctalk
> > wrote:
> >
> >> Last time that I tried to research it, I found that there had once been an
On Wed, May 17, 2023 at 5:29 AM Fred Cisin via cctalk
wrote:
> Last time that I tried to research it, I found that there had once been an
> external drive in which the USB and controller werenot integrated with the
> drive electronics, so that it could easily get a different drive
> connected. I
On Tue, May 23, 2023 at 2:21 PM Paul Koning wrote:
> > I do seriously wonder why nobody has been suggesting the
> > flux-transition type of device. If it can be got to work then it would
> > seem the ideal solution in that it can handle anything the disk drive
> > [1] can handle, including non FM
On Tue, May 23, 2023 at 2:03 PM Chris Zach via cctalk
wrote:
>
> On 5/22/2023 11:53 AM, Sellam Abraham via cctalk wrote:
> > I learned a long time ago that it's a waste of time to trying to help
> > someone who, instead of focusing on solutions, just comes up with endless
> > reasons why your sug
On Mon, May 22, 2023 at 2:14 PM Liam Proven via cctalk
wrote:
>
> > And
> > of course it has to have the right type of disk controller, I
> > certainly need to be able to handle single-density (FM) reading and
> > writing correctly. Some machines can, some can't. I am hardly going to
> > be able
On Mon, May 22, 2023 at 5:25 PM j...@cimmeri.com wrote:
>
> On 5/22/2023 5:38 AM, Tony Duell via cctalk wrote:
> >>> I hereby formally retract my erroneous suggestion of a "386 98,SP2 desktop
> >>> with floppies and USB", and replace my suggestion with:
>
On Sat, May 20, 2023 at 12:22 PM Liam Proven via cctalk
wrote:
>
> On Fri, 19 May 2023 at 23:40, Fred Cisin via cctalk
> wrote:
> >
> > On Fri, 19 May 2023, Liam Proven via cctalk wrote:
> > > I do remember that, because I carried around a USB key with an
> >
> > Thanks, everybody for the reminde
On Thu, May 18, 2023 at 8:03 PM Fred Cisin via cctalk
wrote:
>
> > >
> On Thu, 18 May 2023, Robert Feldman via cctalk wrote:
> > Can you fix it using MODE.com from a DOS prompt?
>
> Or, a full re-install of the USB-RS232 dongle?
Depends on what you mean by a re-install...
Asking Windows to che
On Thu, May 18, 2023 at 5:28 PM Mike Katz wrote:
>
> I run the greaseweazle under window 10 and windows 11. I havent' seen
> any problems as of yet but I am using the command line utilities mostly.
I was running from the command line too. Typing 'gw' just gets a
dialogue box moaning that the pro
On Thu, May 18, 2023 at 5:05 PM Chuck Guzis via cctalk
wrote:
>
> On 5/18/23 08:48, Tony Duell via cctalk wrote:
>
> > I wish I'd never listened to people who said this was easy and would work
> > fine.
> >
> > Never again.
> >
>
> I warned you a
On Thu, May 18, 2023 at 3:16 PM Antonio Carlini via cctalk
wrote:
> At ~£25 you're unlikely to lose much with either of the two front
> runners :-)
Unfortunately in my case that is not true.
I ordered a Greaseweazle earlier today and downloaded the software. Of
course there is no such thing as
On Wed, May 17, 2023 at 9:28 PM Mike Katz via cctalk
wrote:
>
> I have to agree with the folk on here who recommend some kind of flux
> reader/writer like the greaseweazle.
OK, that's what I thought.
Now what are the options. Greaseweazle or ? What are the
advantages and disadvantates of eac
On Wed, May 17, 2023 at 8:49 PM Chuck Guzis via cctalk
wrote:
> As much as Tony doesn't like it, I need to point out that a modern MCU
> quite often has as much (or more) RAM, and runs faster than many older
> PCs. Consider, for example, the lowly STM32H7A3 series. 1.4MB of RAM,
> 2MB of program
On Wed, May 17, 2023 at 8:38 PM Fred Cisin via cctalk
wrote:
> The earliest Osbornes were single density with ten 256 byte sectors per
> track. I was able to write some code on TRS80 model 1 to read those.
> Many PC FDCs, including the IBM 5150/5160, can not do FM/single-density.
>
> Then Osborne
On Wed, May 17, 2023 at 5:54 AM Chuck Guzis via cctalk
wrote:
>
> On 5/16/23 21:29, Fred Cisin via cctalk wrote:
>
> >> From what I've heard, there has been substantial progress on the flux
> > transition devices, with decoding the track to sectors, and even support
> > of some file systems!
> >
>
On Wed, May 17, 2023 at 5:29 AM Fred Cisin via cctalk
wrote:
>
> >> Similarly, he could buy a cheap external USB 3.5" drive. Write content to
> >> that drive on the modern machine, and read those floppies on the older
> >> machines. The readily avaailable one have firmware that only supports
> >
On Tue, May 16, 2023 at 11:42 PM Fred Cisin via cctalk
wrote:
>
> On Tue, 16 May 2023, Wayne S via cctalk wrote:
> > Tony in response to your original idea of wanting to download images for
> > use on you existing machines ( did i get that right?), i think you have
Yes. I've got the machines runn
As you know I've recently restored a couple of CP/M luggable
computers. I also have many other machines with floppy disk drives,
3", 3.5", 5.25" and 8"
The machine I connect to the internet with is a more modern laptop
runnng Windows 8.1. Essentially its only interfaces are USB ports.
I would lik
On Tue, May 2, 2023 at 1:34 PM Paul Koning via cctalk
wrote:
>
> It seems surprisingly hard to find that, though this
> https://forum.vcfed.org/index.php?threads/rs-232-to-current-loop-interface.47841/
> is close.
>
> Conceptually it's really easy. The main tricky part, certainly if you're
> d
On Tue, Apr 18, 2023 at 11:04 PM John Robertson via cctalk
wrote:
>
> I like to start with schematics before poking too much...
So do I.
>
> I assume bad caps (will replace with low-ESR high temp), and possibly
> blown transistor(s)...
>
> *And Gregory Beat sent me a link that covers the 1001 S
On Wed, Apr 19, 2023 at 2:37 AM Tom Hunter via cctalk
wrote:
>
> ... or four $20 power transistors to protect a 10 cent fuse like on the DEC
> VR-14 display.
In general the transistor(s) will fail short-circuit, thus taking out
the fuse too.
Some switch-mode power supplies use special fast-actin
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