Well, I haven't had any problems with DSL running/installing at all, but by browsing on google and finding this site (
http://damnsmalllinux.org/cgi-bin/fo...int;f=8;t=2879) Here's a few boot options I'd recommend:
mem=40M
or
dsl2 failsafe
or
failsafe 2
On an aside, if you're happy with the size of Knoppix, you can always install Slackware and just install only the options you want (this is basically what puppy is anyway). I've successfully installed recent versions of Slackware on 486 and pent 200mhz systems with minimal ram.