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Hi!

Qemu floppies doesn't support media change detection? Int 13,15 and int 13,16.
Int 13,15 outputs AH = 01 "floppy without change-line support".
Int 13,16 always returns CF = 1, AH = 06, which means "change line active or not supported".

QEMU supports floppy disk change. SeaBIOS does not.

Thanks for the answer.
Can I use another BIOS in Qemu that supports change-line detection?

As far as I know, SeaBIOS is your only choice.