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mount -o loop $ISO $T || exit 3
cp -rv $T/* $MNTDIR/ || exit 4
grub-install --root-directory=$MNTDIR $DEVROOT || exit 5
If the splash screen is still not working that might be a 1.98 particularity. GRUB2 devs are pushing to switch to gfxpayload=<RESxRES> but that only works for kernel with efifb, Slackware's kernel hasn't. gfxpayload is a grub environment variable, whereas the old way with the vga=xxx kernel cmdline argument is deprecated.