[Coco] [Color Computer] Create NitrOS9 L1 boot disk for Dragon with FD-502?

[drag0n1969]

I need help creating a NitrOS9 Level 1 boot disk for my unique 
configuration: Tano Dragon with a Tandy FD-502 disk controller.

I have replaced the FD-502's EPROM with a special version of Dragon 
SuperDOS, modified by Phill Harvey Smith to work with the Tandy 
controller hardware. This works perfectly under basic.

Creating a NitrOS9 boot disk is a problem, since the Dragon Dos 
expects the boot sector on track 0 (from sector 3), and not track 34 
as on the CoCo (though both of them load the boot sector to same 
memory address at $2600)

Am I correct that my boot disk should simply be a Dragon NitrOS9 
boot disk with the modules BOOT and RB1773 from the CoCo (replacing 
the dragon's BOOT and DDISK)?

I have tried using MESS to generate this bootdisk – with no success 
whatsoever.

I also tried generating a CoCo bootdisk, replacing the VTIO and 
COVDG – to get a proper Dragon keyboard. Didn't work either


I'm starting to think that the BOOT module contains info about both 
the physical boot sector location, and the controller hardware: thus 
if I use the Coco boot module it finds the hardware, but looks for 
the boot module in sector 34 rather than sector 0.

If this is a correct, I guess the Coco boot module needs to be 
patched to read sector 0?

I have also tried to "force" the dragon to boot a CoCo bootdisk, 
using a small program on the Dragon to read sector 34 from the CoCo 
boot disk, poke it into address 9728 ($2600)  onwards, and EXEC 
9730. Doesn't seem to work either


I have been struggling with this for quite a while now, trying 
numerous combinations. Any help would be greatly appreciated








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