There's another disk image that is called cpmv11.td0, which boots on neither model, and I can't even display its directory if I boot from another floppy image - maybe it's an image of a defective disk.
I've owned a Rainbow 100B since 1984. I couldn't even buy 1.1 at the time, and didn't see it until I returned to using the Rainbow after years away...
I have only ever come across B models, so I can't really say how the A should react and what it should display. The emulated "A" seems to have a different display/terminal emulation attached, as the screen is not cleared when CP/M starts to boot, and you can see a screen formatting code instead.
The "A" and "B" have the same VT100 embedded in them as far as I can tell from the schematics that I've studied (though I can't seem to find the "A" schematics I thought was on bitkeepers so I can't confirm). The differences are the ability to move interrupts, a few extra features in the BIOS (ring the bell, get the version, etc) and better pinouts to the memory expansion card to get an extra 128k of expansion...
