The HyperAMS is the logical extension of the AMS card. It allows for a humongous amount of bank-switched memory in the 32K space of the PEB, just like the SAMS card (its little brother). SAMS gives you up to 1024K, HyperAMS gives you up to 16MB. As it uses the same addressing/switching modes as the SAMS, I suspect that the first 1024K will be instantly recognized by RXB and any of the other SAMS-aware programs. They would probably need to be modified to recognize the rest of the space. . .and no, it is not battery-backed and it doesn't change the menu. Like the SAMS, it is a drop-in replacement for the 32K card. I imagine someone could write an application to use it like a volatile RAM disk, but as it doesn't retain memory, that would only really be useful for programs that were doing massive disk copies, disk defragmentation, or other similar I/O intensive operations.
One other note I remembered after reading the documentation for the card--it does have an option to put Flash chips in, instead of RAM, so there is a possibility of having persistent data on the board.
Building the board in default mode operating as a pure SAMS board uses one layer of memory chips and is 4MB in size. In HyperAMS mode, it adds a second layer of chips for a total of 8MB on board. Significant hand wiring is required to add the other 8MB that would be in chip layers 3 and 4, so I suspect that most boards will only be assembled as 4MB or 8MB HyperAMS cards.
Edited by Ksarul, Sun Sep 21, 2014 10:29 AM.