i am very interested in this. how complete is the library? can i start fiddling with it as it is or is there anything to look out for? i tried unsuccessfully to get similar chips to work with the digilent chipkit board which is one of the reasons i switched over to the DUE. it took me just a day to rewrite a major sketch to work on the DUE and it is perfect with the SDfat library that was not available for the chipkit.
i bought some Micron 5PQs because they are 128 meg and looked very useful. the instruction set is similar to the one you are using. i was never able to get it to work reliably. do you have any interest in checking the data sheet, comparing to the EEPROM you are using and possibly add it to the library? i would love to have 128 (8 by 16 meg) meg available for high speed data aq. dual or quad read/write modes would be great but not essential.