To make a bootable Slackware CD, get into the top level Slackware directory
(The one with ChangeLog.txt in it) and issue a command like this to build
the ISO image in /tmp:

mkisofs -o /tmp/slakware.iso -R -V "Slackware Install" \
-v -d -D -N -no-emul-boot -boot-load-size 4 -boot-info-table \
-b isolinux/isolinux.bin \
-c isolinux/isolinux.boot \
-A "Slackware 8.0 Install CD" .
                          ^^^
(this command will create the 'isolinux/isolinux.boot' boot record)

Then use 'cdrecord' to burn it.  (See 'man cdrecord')

----
notes:
  If you want to master/burn the ISO image under Windows, you're on your own.

  IF YOU INSTALL WITH A 2.4.5 KERNEL, USE "MENU" OR "EXPERT" MODE AND
  BE SURE TO INSTALL A 2.4.5 KERNEL ON YOUR SYSTEM, OR IT MIGHT NOT
  BOOT!  You can also install with "full" mode if you've got an
  appropriate floppy image to install the kernel from.