FIRST: Make sure you have a boot floppy that'll get you into Slack!
Once the new kernel is ready, (the bzImage file that you copy to / or /boot) copy it also to your Win98 drive. Use mcopy, not the linux cp command.
EG: mount the Win drive: mount -t vfat /dev/hda1 /mnt/win (the /mnt/win directory must exist first)
OF COURSE: Change partition and file names to suit.
copy the kernel image: mcopy /boot/bzImage /mnt/win
(You could alternately copy it to a DOS formatted floppy: mcopy /boot/bzImage a:
In windows (or DOS bootup): make a batch file: slack.bat in the loadlin directory
::: Batch file to boot Slackware
::: First, ensure any unwritten disk buffers are flushed:
::: Start the LOADLIN process:
c:\loadlin\loadlin c:\bzimage root=/dev/hda2 ro
::: end SLACK.BAT