On 8/25/22 14:45, Ali wrote:
>> A testament to the drive quality however, is that I have two such
>> systems using these drives and both still work flawlessly after 35
>> years.
>
A quick glance at my spares shelf show a couple of 1016-II (SS 100 tpi,
black latch) I've used the 1015 drives also (b
On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
I had to look up SA400. I'm too young.
The Smithsonian has one. They say it's a 3¼ inch drive.
https://www.si.edu/object/microcomputer-peripheral-shugart-sa400-disk-drive:nmah_334325
*Sigh*
Tom Gardner has successfully gotten
https://americanhi
for almost everything, you would want either double sided 48tpi with 40
tracks ("360K"),
or double sided 96tpi "high density" (for 1.2M).
or double sided 96tpi 80 track (for most "quad density" systems),
They made such, but I never had any other than the 35 and 77 track single
sided ones.
shou
On Thu, 25 Aug 2022, Ali via cctalk wrote:
Out of curiosity what is the model number of the Micropolis drives? I
would like to find a picture of them on the net if possible and see this
precision-ground lead screw mechanism. Thanks.
I'm not Chuck, and I don't have a picture handy.
The pictures
> A testament to the drive quality however, is that I have two such
> systems using these drives and both still work flawlessly after 35
> years.
Chuck,
Out of curiosity what is the model number of the Micropolis drives? I would
like to find a picture of them on the net if possible and see this
On Sun, 21 Aug 2022, Chuck Guzis via cctalk wrote:
Thinking about it a bit more, I wonder if the standard "litany" for
retrying read errors on floppies was due to the disc-and-follower of the
SA400, more so than the leadscrew of the Micropolis. I doubt that
there's much of a difference with the
Thinking about it a bit more, I wonder if the standard "litany" for
retrying read errors on floppies was due to the disc-and-follower of the
SA400, more so than the leadscrew of the Micropolis. I doubt that
there's much of a difference with the taut-band mechs.
Anyway, the litany runs like this:
On Sat, Aug 20, 2022 at 01:26:44PM -0700, Fred Cisin via cctalk wrote:
[...]
>
> Oh, I am well aware that you know far more about such things than I
> ever did, nor ever will.
> I was explaining it for the youngsters on the list, who may not have
> ever encountered such. And, who might not even b
On 8/20/22 15:36, Fred Cisin via cctalk wrote:
> Adkisson and Masaro now deny the whole "bar napkin disk" story;
> In agreement that 8" was larger than desired, they asked Dr. Au Wang
> "What size should it be?"
> Wang picked up the bar napkin (the meeting was not in a conference
> room), and said,
nt: Saturday, August 20, 2022 7:47 AM
To: Liam Proven via cctalk
Cc: geneb
Subject: [cctalk] Re: "Revival" of a dedicated Micropolis webpage on internet
On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
On Tue, 16 Aug 2022 at 23:51, Fred Cisin via cctalk
wrote:
1) because they nee
Maybe it is on a size reduction.
Dwight
From: geneb via cctalk
Sent: Saturday, August 20, 2022 7:47 AM
To: Liam Proven via cctalk
Cc: geneb
Subject: [cctalk] Re: "Revival" of a dedicated Micropolis webpage on internet
On Wed, 17 Aug 2022, Liam
On 8/20/22 13:26, Fred Cisin via cctalk wrote:
> Oh, I am well aware that you know far more about such things than I ever
> did, nor ever will.
I really doubt that.
On the subject of azimuth, even Micropolis didn't get it right. We
started testing the new drives as they came in and about 40% ha
The Dysan Digital Diagnostic Diskette included track(s) where SECTORS
were recorded progressively offset!
I can visualize, and am impressed with, how you offset tracks for
alignment diskettes, but I'm having difficulty imagining the Dysan
mechanism. Large intersector gaps, and a separate pass for
On 8/20/22 12:06, Fred Cisin via cctalk wrote:
>
> The Dysan Digital Diagnostic Diskette included track(s) where SECTORS
> were recorded progressively offset!
> I can visualize, and am impressed with, how you offset tracks for
> alignment diskettes, but I'm having difficulty imagining the Dysan
>
1) because they need to keep reinforcing until the very last SA400 is
buried.
On Sat, 20 Aug 2022, geneb via cctalk wrote:
Fred, Don't forget the SA390 in every Disk II. ;)
The first Disk II's were SA400's with the logic board removed.
Once they had volume (not prototypes), Shugart started le
On Sat, 20 Aug 2022, Chuck Guzis via cctalk wrote:
field use, so it was acceptable to record tracks at various offsets to
get a good idea of how far from the radial ideal the customer's drives
were. I'm a bit surprised with the call for finding alignment disks,
that this hasn't been done in the
> I have to ask, which is tragic? Needing to lookup SA400, or the fact
> that webpage (from the Smithsonian), indicates it~@~Ys a 3 1/4~@~]
> drive. That wasn~@~Yt typo on my part they say *three*.
On the Smithsonian webpage, to add to the tragedy:
Note: Comment submission is temporarily unav
On 8/20/22 08:42, Zane Healy via cctalk wrote:
>
> I have to ask, which is tragic? Needing to lookup SA400, or the fact that
> webpage (from the Smithsonian), indicates it’s a 3 1/4” drive. That wasn’t
> typo on my part they say *three*.
I do have a couple of the 3 1/4" drives and media to m
> On Aug 20, 2022, at 7:47 AM, geneb via cctalk wrote:
>
> On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
>
>> I had to look up SA400. I'm too young.
>>
>> The Smithsonian has one. They say it's a 3¼ inch drive.
>>
>> https://www.si.edu/object/microcomputer-peripheral-shugart-sa400-disk
On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
On Tue, 16 Aug 2022 at 23:51, Fred Cisin via cctalk
wrote:
1) because they need to keep reinforcing until the very last SA400 is
buried.
Fred, Don't forget the SA390 in every Disk II. ;)
I had to look up SA400. I'm too young.
The Smiths
On Tue, 16 Aug 2022 at 23:51, Fred Cisin via cctalk
wrote:
>
> 1) because they need to keep reinforcing until the very last SA400 is
> buried.
>
> 2) It became the recognizable indicator for which disks were which,
> especially for those who wouldn't read the label.
> With a hib-ring is prob'ly a
On Tue, 16 Aug 2022, Bill Degnan via cctalk wrote:
Unrelated factoid. Did you know the Micropolis 1033-II drive is at least
semi-compatible with the Tandy Model 1 Expansion Unit with disk capacity
daugher card / "doubler" setup? Wonder if anyone ever tried this other
than myself.
If you have a
I concur this is useful.
Unrelated factoid. Did you know the Micropolis 1033-II drive is at least
semi-compatible with the Tandy Model 1 Expansion Unit with disk capacity
daugher card / "doubler" setup? Wonder if anyone ever tried this other
than myself.
If you have a 1033-II or similar class d
On 8/16/22 14:51, Fred Cisin via cctalk wrote:
> Dysan disks were always good.
> The early Verbatim disks were not. It was a long time before anybody
> else, such as Wabash, made anything as bad.
> To get over their own reputation, Verbatim redesigned, and came out with
> the "Datalife" series of
I think it was Dysan that first showed up with reinforcing ring kits to
be applied to disks to ameliorate the problem, but ultimately the
solution turned out to be making sure that the motor was on during the
seating process. That's why, for example, 5.25" DD media usually has
hub reinforcement,
On Tue, Aug 16, 2022 at 11:33 AM Jonathan Chapman via cctalk <
cctalk@classiccmp.org> wrote:
> > I think it was Dysan that first showed up with reinforcing ring kits
>
> Probably, "Grabettes."
>
> > Then why was is it that DD media bought well after HD media was
> available, in use, and the norm s
When I got my Micropolis I drive to use on TRS80, it came with a yellow?
loose leaf binder with a Micropolis Operating System.
Sadly, and shamefully, I never got around to trying that.
he drive was 48tpi, 35 track, in a nice blue box. It was slow, (helicaal
lead screw), but not any slower than
Likewise rx01 and 02 drives were always spinning
On August 16, 2022 6:13:49 PM GMT, Chuck Guzis via cctalk
wrote:
>On 8/16/22 10:32, Jonathan Chapman via cctalk wrote:
>>> I think it was Dysan that first showed up with reinforcing ring kits
>>
>> Probably, "Grabettes."
>>
>>> Then why was is i
On 8/16/22 10:32, Jonathan Chapman via cctalk wrote:
>> I think it was Dysan that first showed up with reinforcing ring kits
>
> Probably, "Grabettes."
>
>> Then why was is it that DD media bought well after HD media was available,
>> in use, and the norm still had the reinforced ring? Tradition
> I think it was Dysan that first showed up with reinforcing ring kits
Probably, "Grabettes."
> Then why was is it that DD media bought well after HD media was available, in
> use, and the norm still had the reinforced ring? Tradition?
You might be putting it in an old drive. It was also availa
> I think it was Dysan that first showed up with reinforcing ring kits to
> be applied to disks to ameliorate the problem, but ultimately the
> solution turned out to be making sure that the motor was on during the
> seating process. That's why, for example, 5.25" DD media usually has
> hub reinf
On 8/16/22 08:17, Jonathan Chapman via cctalk wrote:
>> The last time I checked, bitsavers had information on the 1015, 1016 and
>> 1115 floppy drives (I have all three models). Did the VG use something
>> different?
>
> No, but I didn't find the model numbering w.r.t. first chassis vs. expansion
> The last time I checked, bitsavers had information on the 1015, 1016 and
> 1115 floppy drives (I have all three models). Did the VG use something
> different?
No, but I didn't find the model numbering w.r.t. first chassis vs. expansion
chassis very clear, especially between the older "blue box"
On 8/16/22 06:25, Jonathan Chapman via cctalk wrote:
> I stumbled across that the other day, looking for information on their 100
> TPI drives commonly used with Vector Graphic stuff. I was very surprised to
> find it!
The last time I checked, bitsavers had information on the 1015, 1016 and
1115
I stumbled across that the other day, looking for information on their 100 TPI
drives commonly used with Vector Graphic stuff. I was very surprised to find it!
Thanks,
Jonathan
--- Original Message ---
On Tuesday, August 16th, 2022 at 03:42, P Gebhardt via cctalk
wrote:
>
>
> He
On 2022-08-16 3:42 a.m., P Gebhardt via cctalk wrote:
Hello list,
by coincidence, I came across this website:
https://www.micropolis.com/
It seems to have been set up by a former employee of Micropolis with
information about Micropolis products done until the late 90s.
If people are into Mi
You all need to make sure you archive a copy of this site.
Sent from the all new AOL app for Android
On Tue, Aug 16, 2022 at 12:43 AM, P Gebhardt via
cctalk wrote: Hello list,
by coincidence, I came across this website:
https://www.micropolis.com/
It seems to have been set up by a
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