[Coco] Re: Re: Hard Drive Problems

[Rodney V Hamilton]

In article <20040615.213525.1608.0.elderpav at juno.com>, 
elderpav at juno.com says...

>

>On Tue, 15 Jun 2004 07:42:31 -0700 (PDT) Robert Emery

><theother_bob at yahoo.com> writes:

>> --- Rodney V Hamilton 

<Rodney_Hamilton at GBRonline.com> wrote:

>> > >

>> > >Now, if I can only get the downloaded NitrOS-9 boot disks to 

>> work...

>> > 

>> > Fred, try this:

>> > [1] make a floppy from a NitrOS-9 image file

>> > [2] read the floppy back to a new image file

>> > [3] do a binary compare of the old & new images

>> > 

>> 

>> Antoher thought Fred, do your downloaded disks work with an 

>> emulator?

>> 

>> Bob

>

>Now that you mention it, they don't. At least, not in MESS. I type DOS

>and a few seconds later the screen clears and I get the OK prompt. I

>haven't tried it under any of the other emulators yet.

>

>Fred


The boot track in the image file is at logical track 68 as seen by
the DOS command so a simple "DOS" fails to see it.  However, you can
get around this by telling DISK BASIC to boot from track 68 instead!
Try to boot it this way:

  POKE &HDF1C,68:DOS

This should at least start the boot sequence.  I seem to recall that
MESS handles a DSDD image if it has a '.OS9' extension name??
(I don't use MESS myself so please correct me as needed.  Maybe just
renaming the extension is sufficient??)

For the JV/JC emulators you must patch the DD.FMT byte in LSN0
to trick the emulator into treating it as a single-sided image.

Rodney