Not possible I think. Disk swapping works for CDROM's (and CDROM images), but not diskettes.

Installing From multi floppys
Feature Requests: Floppy Disk Swap support and keep File Date stamps

But the readme sais

BOOT
(...)

BOOT [diskimg1.img diskimg2.img .. diskimgN.img] [-l driveletter]
BOOT [cart.jrc] (PCjr only)

diskimgN.img
This can be any number of floppy disk images one wants mounted after
DOSBox boots the specified drive letter.
To swap between images, hit CTRL-F4 to change from the current disk
to the next disk in the list. The list will loop back from the last
disk image to the beginning.

Doesn't that mean it's supposed to work?

uhm mac os x might need some extra key pressed aside from/instead of ctrl

To swap the disks or to mount them?

to swap them when booting.
(booting is when having issued the boot command......)

Just sorted it out, to boot 3 floppies, it needs to look like this :
Z:\>boot E:\Disk1.ima E:\Disk2.ima E:\Disk3.ima
(if E is the drive where your images are located)

I always typed :
Z:\>boot E:\Disk1.ima Disk2.ima Disk3.ima (so I didn't include the E drive 3 times)

And now diskette swapping WORKS (with the normal keys, <fn>F4+ctrl)

Farnsworth wrote:

I always typed :
Z:\>boot E:\Disk1.ima Disk2.ima Disk3.ima (so I didn't include the E drive 3 times)

In MacOS X, there are no drive letters, a path in MacOS X starts with "/Volumes/Macintosh HD/.../Disk1.ima".

I know 😀
But I first mounted a folder as the E drive
and then started with the E:\ stuff

Ah yeah, comes into my mind, that works, too. 😀