[Coco] 3.5" drives

[James Dessart]

I'm interested in putting a 3.5" drive on my CoCo, since 3.5" floppies are
still available in stores, and I do have a couple of Macs that can
read/write to them (even in PC format).

My current setup is an SCII, with two 5.25" drives in the FD-501 case
(sold or traded the controller long ago). One is the original single-sided
drive, and the other is a double sided drive.

What I'd like to have is the double sided 5.25" and add a 3.5" to the
system, getting rid of the single-sided drive. Will this work with RS-DOS?
And what would I have to do to get it working in OS-9? Could I use high
density diskettes? Would I be able to read MSDOS FAT formatted diskettes
from OS-9? Would I need to make any hardware changes?

I have an order for DriveWire placed, so that'll maybe alleviate my desire
to do this... :)

James