I'd like to install an internal HxC in my amiga 1200. I'd like to assign the HxC as DF0 and the current internal floppy as DF1 for writing physical disks. Is this relatively easy to do?
You'd have to hack the drive id circuit on the motherboard so that it responds to df0 & df1. Then hack the internal connector so that when using a pc 3 connector floppy cable with a twist, that it passes the correct drive select to the right drive. Finally if you ever want to use external drives you'd need to hack the external drive connector so that drives start at df2.
I'll leave that to you whether you think it's easy or not.