Broadcom's wireless chip(s) firmware. See project homepage http://linuxwireless.org/en/users/Drivers/b43 for technical details and copyright information. Please be aware that: a) b43-fwcutter is required in order to build the package b) version 4.80.53.0 of the Broadcom driver is required for kernel 2.6.24.x (i.e. Slackware 12.1)