8 Sep
2012
8 Sep
'12
9:24 p.m.
Hey Everybody,
Is there anybody in the San Francisco Bay Area that could create images of
three 5.25" floppies for me? I think that they are 720k with 256 byte
sectors, but I'm not sure. In any case, I've not been able to read them so
far.
10 Sep
10 Sep
7:06 a.m.
I am curator of Museu do Computador, Brazil , Jose Carlos Valle
Thera are 2 kinds of floppies an 360 kb and another in High density 1.2 Mb.
But, with a tool, I cut a small hole at left floppy and I double the
floppy. goes to 720 at total
I have that tool in my Museu.
thanks
2012/9/9 David Coolbear <cool1 at thecoolbears.org>
Hey Everybody,
Is there anybody in the San Francisco Bay Area that could create images of
three 5.25" floppies for me? I think that they are 720k with 256 byte
sectors, but I'm not sure. In any case, I've not been able to read them so
far.
--
*
*
*
*
*
*
*Jos? Carlos Valle - curador *
*Tel: (11)xx4666-7545*
*E-mail: curador at museudocomputador.com.br*
*facebook: www.facebook.com/museudocomputador*
*twitter: @curadordomuseu*
*Cel: **Claro: 98874-0100 ? TIM: 95132-5559 ? VIVO: 99562-0211*
*
*
11 Sep
11 Sep
8:21 a.m.
Jose, if you're talking about the apple floppies, it doesn't double to
720, but 360. The apple floppy is a 180KB disk, and not a 360 one. 360 is
what you get using both sides of the disk.
---
Enviado do meu Motorola PT550
Meu site: http://www.tabalabs.com.br
----- Original Message -----
From: "Jose carlos Valle" <josecvalle at gmail.com>
To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
Sent: Monday, September 10, 2012 11:06 AM
Subject: Re: Reading Floppies
I am curator of Museu do Computador, Brazil , Jose Carlos Valle
Thera are 2 kinds of floppies an 360 kb and another in High density 1.2 Mb.
But, with a tool, I cut a small hole at left floppy and I double the
floppy. goes to 720 at total
I have that tool in my Museu.
thanks
2012/9/9 David Coolbear <cool1 at thecoolbears.org>
Hey Everybody,
Is there anybody in the San Francisco Bay Area that could create images of
three 5.25" floppies for me? I think that they are 720k with 256 byte
sectors, but I'm not sure. In any case, I've not been able to read them so
far.
--
*
*
*
*
*
*
*Jos? Carlos Valle - curador *
*Tel: (11)xx4666-7545*
*E-mail: curador at museudocomputador.com.br*
*facebook: www.facebook.com/museudocomputador*
*twitter: @curadordomuseu*
*Cel: **Claro: 98874-0100 ? TIM: 95132-5559 ? VIVO: 99562-0211*
*
*
10:25 a.m.
yOn Tue, 11 Sep 2012, Alexandre Souza - Listas wrote:
Jose, if you're talking about the apple
floppies, it doesn't double to
720, but 360. The apple floppy is a 180KB disk, and not a 360 one. 360 is
what you get using both sides of the disk.
No, 280K is what you get if you use both sides of an Apple ][ diskette
(140K).
It is GCR (neither FM nor MFM) with 1 side, 13 or 16 sectors per track,
and 256 bytes per sector.
MFM 80 track single sided gives 320K to 400K, 640K to 800K when using both
sides.
To go from 360K to 720K, he is presumably using 80 track (96tpi), with
either 9 sectors per track of 512 bytes per sector, or 18 sectors per
track with 256 bytes per sector. There are numerous such formats.
8:27 a.m.
New subject: Flippies (Was: Reading Floppies
On Mon, 10 Sep 2012, Jose carlos Valle wrote:
I am curator of Museu do Computador, Brazil , Jose
Carlos Valle
Thera are 2 kinds of floppies an 360 kb and another in High density 1.2 Mb.
But, with a tool, I cut a small hole at left floppy and I double the
floppy. goes to 720 at total
I have that tool in my Museu.
Are you talking about a jig to modify a single sided diskette, so that you
can flip it over and use the other side as a single sided diskette?
(called a "flippy" disk)
Are you just punching an additional write-protect notch (suitable
for Apple, Commodore, Atari) or are you punching an additional set of
index hole access holes?
The first such jig that I'm aware of was sold by Don? French.
(sheet metal with tabs to hold the disk against)
The second one was the Berkeley Microcomputer Flip-Jig.
(plexiglass pocket jig)
--
Grumpy Ol' Fred cisin at xenosoft.com
10 Sep
10 Sep
8:48 a.m.
On Sat, 8 Sep 2012, David Coolbear wrote:
Is there anybody in the San Francisco Bay Area that
could create images of
three 5.25" floppies for me? I think that they are 720k with 256 byte
sectors, but I'm not sure. In any case, I've not been able to read them so
far.
1) Do you know what computer created them?
2) FM? MFM? GCR? (Sirius/Victor 9000?)
3) What have you triesd so far?
What messages do you get?
The difference between "General Failure" and "Sector Not Found" IS
significant.
4489
days inactive
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5 comments
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participants (4)
-
cisin＠xenosoft.com -
cool1＠thecoolbears.org -
josecvalle＠gmail.com -
pu1bzz.listas＠gmail.com