For my Operating Systems class this semester I get the wonderful privilage of implementing different aspects in an OS. We are working with an OS called MINIX, which is an extremely small and based largely on UNIX. To help start us on our project we were given Knoppix 3.7 with a MINIX package. Knoppix is a bootable live system cd that is also based on UNIX. In class we were given a walk thru of how to boot up MINIX in Knoppix using QEMU. My problem was that the given Knoppix cd will only run on PC. So I had to looked for a version of QEMU that would run under OS X. The program that I liked the best is called QemuX. The initial download is just a small app that will download and install the latest and greatest QEMU. Here are some others that I have found.
QEMU OS X Binaries
QEMU Darwin Port OS X
and here is an archive of the MINIX folder that was included on our knoppix cd by our professor. It includes a.img which is a logical floppy image and linux-dist.tar.gz which holds the b30m disk image to boot minix.