I didn't use much this printer but it seems to work with IBM ProPrinter drivers. I've been told that ProPrinter II is the best (and it's the only one i've tried so far).
They are much better, in my experience, than those windows drivers designed for the Olivetti DM 95.
The CUPS drivers (CUPS v. 1.1.10-9 mdk) only list ProPrinter model II (working).
Hope this helps for those running CUPS on other platforms than Linux.