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==================================================================
         MikeOS -- The Mike Operating System kernel
                FAT12 FLOPPY DISK ROUTINES
==================================================================

os_get_file_list

Generate comma-separated string of files on floppy

• IN/OUT: AX = location to store zero-terminated filename string

Example:

code here

os_filename_convert

Change 'TEST.BIN' into 'TEST BIN' as per FAT12

• IN: SI = filename string
• OUT: DI = converted filename string (carry set if filename invalid)

Example:

code here

os_load_file

Load file into RAM

• IN: AX = location of filename, CX = location in RAM to load file
• OUT: BX = file size (in bytes), carry set if file not found

Example:

code here

os_write_file

Save (max 64K) file to disk

• IN: AX = filename, BX = data location, CX = bytes to write
• OUT: Carry clear if OK, set if failure

Example:

code here

os_file_exists

Check for presence of file on the floppy

• IN: AX = filename location
• OUT: carry clear if found, set if not

Example:

code here

os_create_file

Creates a new 0-byte file on the floppy disk

• IN: AX = location of filename
• OUT: Nothing

Example:

code here

os_remove_file

Deletes the specified file from the filesystem

• IN: AX = location of filename to remove
• OUT: Nothing

Example:

code here

os_rename_file

Change the name of a file on the disk

• IN: AX = filename to change, BX = new filename (zero-terminated strings)
• OUT: carry set on error

Example:

code here

os_get_file_size

Get file size information for specified file

• IN: AX = filename
• OUT: BX = file size in bytes (up to 64K) or carry set if file not found

Example:

code here

==================================================================
  INTERNAL OS ROUTINES -- Not accessible to user programs
==================================================================



 
disk_get_root_entry
Search RAM copy of root dir for file entry

 

IN: AX = filename 
OUT: DI = location in disk_buffer of root dir entry,or carry set if file not found


Example:

code here






 
disk_read_fat
Read FAT entry from floppy into disk_buffer

 

IN: Nothing 
OUT: carry set if failure


Example:

code here






 
disk_write_fat
Save FAT contents from disk_buffer in RAM to disk

 

IN: FAT in disk_buffer 
OUT: carry set if failure


Example:

code here





 
disk_read_root_dir
Get the root directory contents

 

IN: Nothing 
OUT: root directory contents in disk_buffer, carry set if error


Example:

code here






 
disk_write_root_dir
Write root directory contents from disk_buffer to disk

 

IN: root dir copy in disk_buffer
 
OUT: carry set if error


Example:

code here





 
disk_convert_l2hts
Calculate head, track and sector for int 13h

 

IN: logical sector in AX 
OUT: correct registers for int 13h


Example:

code here


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