===============================================
  BUGS / THINGS TO FIX   (incomplete list)
===============================================


MMU zero-pages
==============
If a previously unreferenced page is accessed, a mapping to 
the zero-page is inserted in the hash table. The mapping is
not updated if a write occur from one of the other two
MMU-modes.


MMU-BAT (FIXED)
=======
The PTEs in the hash-table used to emulate a BAT-register
remain even after the BAT-register has been altered.


604/603 separate BATs
=====================
IBATs/DBATs are not entirely treated as split bats
(due to implementation reasons). This should not 
be a problem.


Processor "emulation":
======================
- DEC register			DONE
- HIDx registers
- Floating point operations	DONE
- DBATs (for 603/604)		DONE

