Thanks! I tried unetbootin and I created a bootable USB drive successful (both Slacko 5.6 and Lucid 5.2.8).
However, the computer an Acer Aspire One did not won't to boot, I only got a black screen with a blinking cursor
Tried the USB drive on another computer and it could run puppy successful.
Let see if I have the curiosity to continue an another day
(At least I have read about people that run puppy on an Aspire one.)