If your goal is to display as much information as possible, I'd take a look at Chapter 4: System and Equipment Detection of The Undocumented PC by Frank van Gilluwe.
(Starting at page 95 in the first edition (Internet Archive) or at page 129 in the second edition (Internet Archive).)
Aside from the explanatory text, it includes a sample x86 assembly program to retrieve the relevant data which should also be present on the companion floppy (Internet Archive).