[Coco] NitrOS9 build errors

[Aaron Wolfe]

On Jan 21, 2014 12:20 AM, "Greg Law" <glaw at live.com> wrote:
>
> Just to stick another monkey wrench into the works, these should have a
.os9 extension if they are standard OS-9/NitrOS-9 images without any header
information. Most of the emulators interpret this extension to mean the
disks don't have any header information and derive the geometry from LSN 0
(the first 256 bytes of the image). Any images with a .dsk extension should
have the JVC header, but this extension shouldn't be used for OS-9/NitrOS-9
disks.
>

I dont know enough about the emulators and standards to agree or disagree,
but in working on DW I do know that a vast majority of disk images one will
find online are named something.dsk, and very few have a JVC header.
Almost all are just linear sector data.  In fact, I never encountered a JVC
style disk "in the wild" and had to go specifically looking for one to test
with when I added JVC support.  I am not sure if the nitros9 project would
want to deviate from this even if it is the "correct" thing to do.

>
> -----Original Message----- From: Tormod Volden
> Sent: Monday, January 20, 2014 6:48 PM
>
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] NitrOS9 build errors
>
> On Mon, Jan 20, 2014 at 9:49 AM, Ciaran Anscomb wrote:
>>
>>
>> The biggest issue for any emulator is the lack of JVC header information
>> - without this, it's impossible to tell the difference between a 40T
>> double-sided disk and an 80T single-sided one.
>
>
> And that was all that was needed to make
> nos96809l1v030209d64_40d_1.dsk and nos96809l1v030209d64_80d.dsk boot
> in XRoar :)
> I prepended a 0x12 0x02 JVC header. Thanks for the hint.
>
> I had nos96809l1v030209d64_40s_1.dsk working fine, but wondered if the
> double side code was broken...
>
> Thanks,
> Tormod
>
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