maybe it's an image of a defective disk.
I tried a couple different teledisk reading programs: both decoded the cpm21.td0 but failed on the CPMV11.TDO that I could find online.
I bought a collect of Rainbow disks years ago. I'll see if i have a copy of this in that collection...
I have one disk that has a label:
That boots like this on the 100B
and like this
on the 100A (the weird escape sequences after A> are from my taking the screen shot)
would that be useful to upload?