Looking at the descriptions, you may have trouble if the BattDisk is fully populated with 8 megs of ram since the 2000 only has 8MB of space to configure everything in.
Battdisk is not memory mapped and so does not suffer from this.
It's an NVRAM hard drive. Plus it has a maximum RAM of 2Mbytes. It's pretty useless.
The AccessX board is also pretty useless if the ROM is v626 or above
