This is an ISO image of the Slackware 12.0 CD1, recreated with the mkisofs option "-boot-load-size 4".
This allows the CD to boot on some older motherboards' BIOSes, where the default setting fails
(such as my own Pentium II board).
If you have the official discs or ISOs, and can't make CD1 boot for installation, this may be your
savior -- especially since, as of Slackware 12.0, floppy booting is no longer possible.