I tried CPU Director 1.5f5 and that works! :beige:  I can now control the 2nd level cache amongst other things.

BTW, the ZIF processor card is a Metabox joeCARD Z 400 Mhz. I think it was a unauthorized clone of a US product by a German company and that was also the reason why they had to cease production.

I rescued some info about the card from the web with the help of the Wayback machine. If somebody is interested drop me a note.