[Coco] OS9 vs RSDOS disks

[Luis Antoniosi (CoCoDemus)]

if you have a non os-9 disk it will read only the lsn. After that it will
fail with a error 247 - sector error.

So, if you can read sector 0 but nothing so far, than you have a non os-9
floppy on it.


On Thu, Jun 13, 2013 at 11:12 PM, Bill Pierce <ooogalapasooo at aol.com> wrote:

>
> Bob, this (for now) going to be exclusive to OS9. I just need to know how
> to ID asto whether a disk is OS9 or DECB. The program is for writing to and
> from DECB disks from OS9 (fd, hd, vhd etc) with a file manager so, if the
> user selects a drive, I can verify if the disk in the drive is os9 or
> rsdos. Of course it will error one way or the other, but then you have to
> deal with the error. I think if I use Mr Gault's method, it would be safe
> to assume if it didn't pass the test, then it's an RSDOS disk.
> Here's a link to the blog for the new program
>
> https://sites.google.com/site/dabarnstudio/hrsview
>
> It should be in testing mode by next week :-)
>
> Bill Pierce
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
> Co-Contributor, Co-Editor for CocoPedia
> http://www.cocopedia.com/wiki/index.php/Main_Page
> E-Mail: ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Bob Devries <devries.bob at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Thu, Jun 13, 2013 10:26 pm
> Subject: Re: [Coco] OS9 vs RSDOS disks
>
>
> Robert,
>
> Your explanation of the LSN0 structure is great, but it only holds true
> with
> Single-sided disks. On a double-sided disk, the directory sector could
> possibly be on the other side of the disk, which, from the point of view of
> writing a DECB identifier, wuld open a large can of worms.
>
> Regards, Bob Devries
> Dalby, QLD, Australia
>
> ----- Original Message -----
> From: "Robert Gault" <robert.gault at att.net>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Friday, June 14, 2013 8:56 AM
> Subject: Re: [Coco] OS9 vs RSDOS disks
>
>
> > Bill Pierce wrote:
> >>
> >> Hi guys,
> >> Is there a simple way to tell an OS9 disk from an RSDOS disk? Maybe
> >> something constant in LSN0 on the OS9 disk?
> >> It would be nice to identify the disks through software
> >>
> >> Thanks
> >>
> >> Bill Pierce
> >
> > Bill,
> >
> > Unfortunately there is no sure fire method. What might work most of the
> > time is to see if there is a root directory in the correct location. If
> > there is, then the disk is at least formatted for OS-9 but might also be
> > formatted for Disk Basic.
> >
> > LSN0 bytes $08, $09, $0A are DD.DIR - address of starting sector of root
> > directory
> >
> > DD.DIR bytes $10, $11, $12 - indicate address of first sector of
> directory
> > listing
> >
> > First sector of listing for any directory
> >
> > bytes
> > $00   $2E $AE
> > $20   $AE
> > These are the .. and . entries in any OS-9 directory but they are never
> > printed by the command dir.
> >
> > Robert
> >
> >
> > --
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> > Coco at maltedmedia.com
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>
>
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