Thank you, Ceel!
You were right. I download from the list obtained from this site but it was wrong, apparently. I downloaded another slitaz-core44.iso and this behaved like you write. With Grub2 it did not work:
Can't find recordfail
/boot/slitaz...iso is not found
disk 'lb' not found
You need to load the kernel first
But with this iso-file a frugal boot (with bzImage64 and rootfs.gz worked and it behaves as I want slitaz to perform. I checked it out and found that everything works with
lxappearance 0.6.3 x-window
lxde 0.3.2.1 meta
lxinput 0.3.5 x-window
lxpanel 0.10.0 x-window
lxrandr 0.3.2 utilities
lxsession-edit 0.2.0 x-window
lxsession046 0.4.6.1 x-window
lxtask 0.1.9 system-tools
and dbus...18.
A bit strange for me but I can live with that. Please mark this as solved!
And have a splendid weekend,
Michael