ISA, VLB, EISA, and PCI buses are all supported.
PS/2 and Microchannel (MCA) is supported in the standard kernel 2.0.7. There is support for MCA in kernel 2.1.16 and newer, but this code is still a little buggy. For more information you can always look at the Micro Channel Linux Home Page ( http://glycerine.itsmm.uni.edu/mca/)