As Tinkster said ...
The kernel is where support for hardware comes.
Slackware-11.0 will load with a 2.4.33 kernel by default,
and you can choose from one 2.6.16.x kernel in /extra, or
perhaps the latest stable kernel in /testing.
Therefore, your hardware has as good a chance of it being
recognized in Slackware as any other Linux distribution.
What hardware are you concerned about?
Whilst you wait on Slackware-11.0, you can download a Knoppix
iso image and burn a LiveCD/DVD. Then you can boot your computer
with it and see what hardware you have, and how well it's setup
This isn't the same as Slackware, but you can at least get a list
of what's on your motherboard by issuing "/sbin/lspci" from a
terminal in Knoppix.