Thanks for the replies.
@JaX
Nope, it's not working. I've removed the battery and RTC. The motherboard revision is 1D4 "ligth green" (UK).
@Brian
That mod is FAR beyond my soldering skills.
Btw: The accelerator boards works perfectly if delfina isn't connected. The timing problems arise when you use the clockport with an accelerator card?.
Regards.