> > 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.
Fred Cisin wrote:
> 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.
Granted, Pennington's book is a good place to start, even though it
doesn't cover the differences in Model III TRSDOS. It doesn't help
Sellam much, though, if he doesn't have a copy.
In my other reply, I gave a pointer to the on-line Programmer's Guide to
TRSDOS/LS-DOS Version 6. Here it is again:
http://www.tim-mann.org/trs80/doc/prgguide.pdf Although the Guide is
denser and not nearly as fun to read as Pennington's book, it contains
the same information (and more) and has the advantage of already being
on-line. It also has the same drawback, namely that it doesn't cover
the differences in Model III TRSDOS.
> 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.
Does Model III TRSDOS compute the HIT codes the same way as the other
TRSDOS-like systems? I don't recall. Since Radio Shack randomly
changed so many other things (sectors starting at 1 instead of 0, not
having directory entries for the system files, swapping the DAMs,
changing directory entries from 32 to 48 bytes, various smaller
details), it wouldn't be surprising.
--
Tim Mann tim_at_tim-mann.org http://www.tim-mann.org/
Received on Sat Dec 07 2002 - 18:46:15 GMT