mount A A:\ -t floppy ?

You might also try making an image of the floppy itself then attempt to mount the image instead.

What exactly are you typing in DOSBox? Do you use "-t floppy" when mounting the disk? (Nothing running in DOSBox is going to care if the files it is trying to access are actually on a floppy according to Windows.)

EDIT: ooh, skillfully ninja'd.

I had a similar issue with Hyperspeed and had to install it through Windows before mounting it in DOSBox.

I seem to remember that X-Men also requires the cputype=386_prefetch option to be set in the configuration, otherwise the game will crash.
It might be related somehow.

oldtimegamer wrote:

I just bought a vintage 3.5 inch floppy disk game. The game is copy protected.

Is it on a 1.44 MB floppy disk drive?
Which is the only floppy format supported for USB floppy drives (this is a hardware related, not DOSBox related problem).
Such drives can't handle the 720 kB floppy disks.

Depending on the game it might not be possible without a crack. The copy protection that Sierra used for some of their AGI games faked "bad" sectors to hide some of the copy protection. I can't say if similar might be the issue with X-Men: Madness in Murderworld.

IIGS_User wrote:

Is it on a 1.44 MB floppy disk drive?
Which is the only floppy format supported for USB floppy drives (this is a hardware related, not DOSBox related problem).
Such drives can't handle the 720 kB floppy disks.

I am quite sure you are mistaken. I have never heard of a floppy drive being unable to support 720 kB disks. (The only such hardware limitation I am familiar with is that PC floppy drives cannot read 800 kB Macintosh disks, or Amiga floppies.)

I remember my old ibm ps/1 had a floppy reader who was able to format 720kb floppies (with 1 hole) as 1.4mb. The newest floppy drivers cannot read 720kb formatted as HD (I had to create the hole myself back in the past). And probably they cannot read hd floppies formatted as 720kb too.

Myloch wrote:

I remember my old ibm ps/1 had a floppy reader who was able to format 720kb floppies (with 1 hole) as 1.4mb. The newest floppy drivers cannot read 720kb formatted as HD (I had to create the hole myself back in the past). And probably they cannot read hd floppies formatted as 720kb too.

It's plainly a very, very bad idea to format HD floppies as DD, or vice versa. And it always was a bad idea. Can you spell data loss?