Boot up Slackware with the floppy
Click terminal mode, type "su", supply the password and become the super user witb the root privileage to amend the system file
The Lilo comman "lilo -b" allow you to put Lilo anywhere you wish to
put Lilo in the first IDE disk
put Lilo in the first Sata disk
Only you know which your book disk hda or sda boot first so choose the one that is at the top of the booting queue.
puts Lilo in the floppy
puts Lilo in the partition hda9 and so on
The last alternative is for the OS residing in hda9 to be booted by the boot loader controlling the MBR.
Lastly if you alter /etc/lilo.conf you must issue the "lilo" command in a terminal so that the bootloader is re-compiled, otherwise the changes will not be implemented.