Okay, the persistent data store/file system just landed. It provides the basics - file open, close, read, truncate, append, write, etc. Currently I'm supporting four simultaneously opened files from a choice of 26 named files (A to Z). Files are organized as up to 255 records, each record being up to 250 bytes long (so, more space than there's FLASH to support).

More wiki pages to write now I suppose.