I have it working now...
My board runs with a 80C31 on 11.0592MHz
and as I said: I have two 74HC573's connected to the databus and mapped in memory space.
With appropriate delay's it should be possible to have it working at 24MHz as well because the 573's behave just like a port really. When writing to them and leaving the status as it is, it is possible to create all timing needed.

aad sieraad