Fairlight-CMI

As I continue weeding through my disk collection, I came across an unlabeled
disk that apparently contains QDOS 5.07, but it seems to be a different
version than I already have.

This version of QDOS 5.07 starts up with:

IO/2.24/K

QDOS 5.07
:

The different thing being the "IO/2.24/K" part - my usual disk just starts
up with just the "QDOS 5.07" and the ":" prompt. Also, the IO/2.24/K version
uses both upper and lower case letters for the functional prompts, where my
usual version displays in all upper case.

Any hints on what the differences are?

Regards,

Daniel