> I've tracked it down to rouine iteattach() in ite.c, where it seems that 
> the call to pmap_extract() returns zero, which of course won't match the 
> value for conspa.

As far as I can tell, pmap_extract() returns zero when asked to
extract the adress which is already physical, i.e. mapped to
itself. In your case internal video is probably mapped to physical I/O
address, therefore zero. One solution can be to check the adress
itself when pmap_extract() returns zero and you are sure the address
is valid.

	Taras Ivanenko