5 Dec
2002
5 Dec
'02
10:37 p.m.
Eric Smith wrote:
I think you want _TRS-80 Disk and Other Mysteries_.
That was one of
the Mysteries books I didn't have, but ISTR that Al turned up a copy
recently.
No, that only covers Model I TRSDOS 2.x and NEWDOS 2.1. Sellam asked
about TRSDOS 1.3, which I have to assume means Model III TRSDOS.
Each track had 10 sectors. They were allocated to
files in groups of
five, which were called granules or grans. There's a Granule
Allocation Table (GAT) which I think was basically an allocation
bitmap.
Model I TRSDOS (and single density disks on all TRSDOS-like DOSes that
support single density) uses this format.
--
Tim Mann tim(a)tim-mann.org http://www.tim-mann.org/
6 Dec
6 Dec
2:22 a.m.
On Fri, 6 Dec 2002, Tim Mann wrote:
Eric Smith wrote:
Correct. Or at least, the disks I am trying to read files from are
definitely TRSDOS 1.3.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com *
I think you want _TRS-80 Disk and Other
Mysteries_. That was one of
the Mysteries books I didn't have, but ISTR that Al turned up a copy
recently.
No, that only covers Model I TRSDOS 2.x and NEWDOS 2.1. Sellam asked
about TRSDOS 1.3, which I have to assume means Model III TRSDOS. 
7:24 a.m.
> I think you want _TRS-80 Disk and Other
Mysteries_. That was one of
> the Mysteries books I didn't have, but ISTR that Al turned up a copy
> recently.
On Fri, 6 Dec 2002, Tim Mann wrote:
No, that only covers Model I TRSDOS 2.x and NEWDOS
2.1. Sellam asked
about TRSDOS 1.3, which I have to assume means Model III TRSDOS.
True.
But before we deal with the parameters (MOSTLY minor) that differ, he
needs a tutorial on how the directory structure works for that family of
operating systems. Pennington's book provides a good one, unless and
until one of us has an opportunity to sit down with him and go through the
details.
For example, for READING files, he doesn't need to know all of the details
of the H.I.T., but I'm sure that he would appreciate learning it ANYWAY,
and he will need it sometime in the future when he wants to WRITE files.
--
Grumpy Ol' Fred cisin(a)xenosoft.com
8:59 a.m.
On Fri, 6 Dec 2002, Fred Cisin (XenoSoft) wrote:
But before we deal with the parameters (MOSTLY minor)
that differ, he
needs a tutorial on how the directory structure works for that family of
operating systems. Pennington's book provides a good one, unless and
until one of us has an opportunity to sit down with him and go through the
details.
For example, for READING files, he doesn't need to know all of the details
of the H.I.T., but I'm sure that he would appreciate learning it ANYWAY,
and he will need it sometime in the future when he wants to WRITE files.
Well, for now I am content (and only have time) to learn hwo to read files
only. But yes, at some point it would be nice to understand the
whole architecture, as it would allow me to compare with the Apple ][ DOS.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com *
7900
days inactive
7900
days old
3 comments
3 participants
participants (3)
-
cisin＠xenosoft.com -
foo＠siconic.com -
tim＠tim-mann.org