FYI, the newer PCMs run either Intel 28F800 or the AMD 29F800 chips... both are still bottom boot. The 28F800 is the same as the 28F400 but has 4 extra 128k banks, the AMD 29F800 bank architecture is different to the Intel but still does the same job.

The link to the intel doc is around here someplace, the link to the AMD is here:

http://www.amd.com/us-en/assets/cont...docs/21504.pdf