gaf3:/tmp# mount -t minix -o loop diskette.img /mnt/
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
gaf3:/tmp# dmesg | tail
vmnet1: no IPv6 routers present
UDF-fs: No VRS found
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
psmouse.c: GlidePoint at isa0060/serio4/input0 lost synchronization, throwing 1 bytes away.
psmouse.c: resync failed, issuing reconnect request
loop: loaded (max 8 devices)
VFS: Can't find a Minix or Minix V2 filesystem on device loop0
VFS: Can't find a Minix or Minix V2 filesystem on device loop0
VFS: Can't find a Minix or Minix V2 filesystem on device loop0