From https://github.com/micropython/oofatfs, branch work-R0.13c, commit cb05c9486d3b48ffd6bd7542d8dbbab4b1caf790. Large code pages (932, 936, 949, 950) have been removed from ffunicode.c because they were not included in previous versions here.
From https://github.com/micropython/oofatfs, branch work-R0.12b, commit 46fb53331e7a583c29a41d37ce4b53f2718597e5.
From https://github.com/micropython/oofatfs, branch work-R0.12b, commit a346ccec123c2e4d887e2751d64156208d03bff4.