This is based on a 8255 expansion of the port Keil decoder firmware, the drive to achieve the right fat32 control. Not very easy to find online.

Packet : 121025c51_fat32.zip filelist
fat32
fat32.c
fat32.h
fat32.lnp
fat32.LST
fat32.M51
fat32.OBJ
fat32.Opt
fat32.plg
fat32.Uv2
fat32.__i
fat32_Opt.Bak
fat32_Uv2.Bak
FAT_TEST.C
FAT_TEST.LST
FAT_TEST.OBJ
FAT_TEST.__i
fileio.c
fileio.h
fileio.LST
fileio.OBJ
IDE_LIB.C
IDE_LIB.H
IDE_LIB.LST
IDE_LIB.OBJ
IDE_TEST.LST
IDE_TEST.OBJ
STARTUP.A51
STARTUP.LST
STARTUP.OBJ
timertest.LST
timertest.OBJ
TIMERTICK.C
timertick.h
TIMERTICK.LST
TIMERTICK.OBJ
util.c
util.h
util.LST
util.OBJ

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