Help about finding FAT entry

[DIGO_RP]

I´m trying to create a unit in pascal to read a floppy as MSDOS does
but I found a small bug I don´t know how do I link the bytes 26,27 of Directory table with the FAT entry I create a table FatBuffer := Array[1..4607] of byte;
it´s correct ? ReadLogicalSector(FatBuffer[DIR_FstClusLO], 1);

any idea?

[DIGO_RP]

please! I don´t want to bore anyone! I just need some help!