The changes described in this chapter
were made in OpenVMS Version 7.2 to support OpenVMS Galaxy and memory
holes. The change involves moving the direct-mapped DMA window away
from physical memory location 0. This chapter should provide enough
background and information for you to update your driver if you
have not yet updated it to OpenVMS Version 7.2 or later.
Note that this chapter does not cover the bus-addressable
pool (BAP).