or previous
value written.&nbsp; Based on circumstantial evidence from one game, this
register may contain the value pointer minus one in regular HDMA (e.g.
if this register contained $123456, it would mean that the next value to
be written was contained in $123457.)&nbsp; In indirect HDMA, this register
probably contains the pointer to the value after indirection.

<P>When using regular HDMA, either the bank is copied to this register
or the bank stored here is ignored.&nbsp; In Indirect HDMA, however, the