Starrel writes: " The Slackware 8.1 ISO image used a "no-emulation" boot image. Most recent BIOS's are capable of booting that CD, but many older (and some not-so-old) systems cannot.
If your system is unable to boot the 8.1 CD you have several choices. The standard "supported" method is to create a boot disk and 5 root disks from images available for download (or on the second CD if you purchased the official Slackware set from store.slackware.com).
We find that we are lucky to have one working diskette; six is out of the question. So DOSSLACK lets us install Slackware with that one good floppy."