[Coco] Help with Nitros9 on SDC?

[Don Barber]

Jeff, thanks so much, this is absolutely it.

So it comes down to my ignorance of how OS9 does drivers and device 
descriptors work...I didn't even think of this as a possibility. Will do 
further research on how descriptors are assigned and how to list them.

Thanks,

Don

On 4/10/21 12:00 AM, Jeff Teunissen wrote:
> I'm 99% sure that your problem is caused by the use of the /D0 and /D1
> device descriptors.
>
> The CoCoSDC normally emulates a floppy controller, and that works
> great for floppy-sized images, but not _totally_ for hard drive sized
> ones like the ones we use for NitrOS-9.
>
> Now, the CoCoSDC boot file for NitrOS-9 3.3.0 includes two different
> disk drivers to operate the SDC: there's the classic "rb1773" driver,
> which old OS-9 called "CC3Disk" and talks to the SDC like it's a
> floppy controller (and has devices /D0, /D1, /D2, and /D3), and
> there's the "llcocosdc" driver, which talks to the SDC like it's a
> hard drive and has devices /SD0 and /SD1.
>
> If you check the number of cylinders, sides, sectors, etc. of the /D0
> and /D1 devices, you will probably find that they're set up for
> 80-track 720K floppy disk drives, or possibly 360K drives, while the
> /SD0 and /SD1 devices are set up for disks with thousands of
> cylinders.
>
> If you never actually use a real floppy controller, you can safely
> remove the rb1773, d0, d1, d2, and d3 modules from your boot file to
> save a bit of memory, or leave them in and just stop using them.
> Either way, you want to use /SD0 and /SD1 instead.
>
> <snip>