CPU Director for OS 9 does a better job than XLR8s, and no serial required!

You also need to couple the multiplier with a bus speed the 8600/9600 likes; most don't like to be pushed much above 55Mhz, I'd say 50Mhz is a safe bet (ie. look for a DIP switch setting like 50Mhz bus x 8X multiplier.

JB