Ok,
I tested to activate the memory without any harddrive controller. Copied a few mb's to the RAM: and it worked OK.
But as soon as the harddrive is activated and the memory is configured the machine hangs.
I have also tried to change the MASK on the harddrive to 0x1FFFFE so it will only use the DMA to and from the chipmem only. But neither this works....help!