What sort of equipment did spirit and opportunity carry?

As far computer level components, the following site sums it up pretty well: http://community.livejournal.com/zaurus/3094.html

Thes apparently run a similar OS to Linksys WRT54Gv8.0 Routers which also run VxWorks but on a 200Mhz processor as opposed to 25Mhz of the rovers.