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NC – Norton Commander
I should write a program like NC.
I need to access Fat Table in Assembly to show files and directories in my program.
Does anybody know how I can access Fat in assembly( both floppy and Hard Disk )
What Interrupts should I use?
Thanks in advance.
Probably the FAT is protected by the OS for security reasons, so I guess you can’t read/write it. You can still use the interrupt #21h (3D – open, 3E – close, 3F – read, 40 – write, 42 – seek, 4E – find first file, 4F – find next file) or the interrupt #13h.
Int 13h is for low level disk services, so you can directly read or write any (I think) hard disk’s (and floppy’s) sector you want (functions 2 and 3).
Int 21h allows you more high level file operations (some of which are listed above). Find first file and first next file find files that match a certain search pattern (just like windows’s find, so you can list all files whose name is “ab?c.e?d”). I’m not sure if these functions list the directories too, you should check