crystal is 11.0592MHz
the chip seems to be running in 12clk mode (ALE 1.8MHz approx).

As to why I try to do it: tha chip came in as a replacement part on a Rigel board that is equipped with some nice features for debugging/prototyping (swapping of RAM/EPROM e.g.). In the long run, there won't be any need for it to run in an EPROM equipped board, but, on the other hand, shouldn't it be possible rather easily???

Thanks so far!
-uwe