Compaq is a computer company. They are the people that invented the IBM Compatible (clone) PC. They were bought by HP in 2003.
Compaq's lineage of machines:
Linux on lots of Compaq laptops http://www.linux-on-laptops.com/compaq.html
http://www.compaq.com/ has lots of service packs (called !RomPaqs?)
http://criggie.org.nz/network/#slate was CraigFalconer's Compaq Concerto.
BIOS access on a Compaq - Press F10 repeatedly when the block cursor appears in the top right corner of the screen. Normally about the point where the machine beeps twice. A good proportion of the Compaq machines have their system software stored in a "diagnostics" partition, which is often sized from 500 kilobytes to 10 or 20 megabytes, and is positioned at the front of the first hard drive, but is partition 3, aka /dev/hda3. You can download these files from www.compaq.com (somewhere)
8 pages link to Compaq: