Дисковая память: данные читаются с помощью int 25h, а нужно что бы считывались по FCB

--------D-210F-------------------------------
INT 21 - DOS 1+ - OPEN FILE USING FCB
AH = 0Fh
DS:DX -> unopened File Control Block (see #01322,#01323)
Return: AL = status
00h successful
FFh file not found or access denied
Notes: (DOS 3.1+) file opened for read/write in compatibility mode
an unopened FCB has the drive, filename, and extension fields filled
in and all other bytes cleared
not supported by MS Windows 3.0 DOSX.EXE DOS extender
DR DOS checks password attached with AX=4303h
(FAT32 drive) this function will only succeed for creating a volume
label; FAT32 does not support FCBs for file I/O
BUG: APPEND for DOS 3.3+ corrupts DX if the file is not found
SeeAlso: AH=10h,AH=16h,AH=3Dh,AX=4303h

Format of File Control Block:
Offset Size Description (Table 01322)
00h BYTE drive number (0 = default, 1 = A, etc)
FFh is not allowed (signals extended FCB, see #01323)
01h 8 BYTEs blank-padded file name
09h 3 BYTEs blank-padded file extension
0Ch WORD current block number
0Eh WORD logical record size
10h DWORD file size
14h WORD date of last write (see #01643 at AX=5700h)
16h WORD time of last write (see #01642 at AX=5700h) (DOS 1.1+)
18h 8 BYTEs reserved (see #01324,#01325,#01326,#01327,#01328)
20h BYTE record within current block
21h DWORD random access record number (if record size is > 64 bytes, high
byte is omitted)
SeeAlso: #01323

Format of Extended File Control Block (XFCB):
Offset Size Description (Table 01323)
00h BYTE FFh signature for extended FCB
01h 5 BYTEs reserved
06h BYTE file attribute if extended FCB
07h 36 BYTEs standard FCB (all offsets are shifted by seven bytes)
SeeAlso: #01223

Format of FCB reserved field for DOS 1.0:
Offset Size Description (Table 01324)
16h WORD location in directory (if high byte = FFh, low byte is device
ID)
18h WORD number of first cluster in file
1Ah WORD current absolute cluster number on disk
1Ch WORD current relative cluster number within file
(0 = first cluster of file, 1 = second cluster, etc.)
1Eh BYTE dirty flag (00h = not dirty)
1Fh BYTE unused

Format of FCB reserved field for DOS 1.10-1.25:
Offset Size Description (Table 01325)
18h BYTE bit 7: set if logical device
bit 6: not dirty
bits 5-0: disk number or logical device ID
19h WORD starting cluster number on disk
1Bh WORD current absolute cluster number on disk
1Dh WORD current relative cluster number within file
1Fh BYTE unused

Format of FCB reserved field for DOS 2.x:
Offset Size Description (Table 01326)
18h BYTE bit 7: set if logical device
bit 6: set if open???
bits 5-0: ???
19h WORD starting cluster number on disk
1Bh WORD ???
1Dh BYTE ???
1Eh BYTE ???
1Fh BYTE ???

Format of FCB reserved field for DOS 3.x:
Offset Size Description (Table 01327)
18h BYTE number of system file table entry for file
19h BYTE attributes
bits 7,6: 00 = SHARE.EXE not loaded, disk file
01 = SHARE.EXE not loaded, character device
10 = SHARE.EXE loaded, remote file
11 = SHARE.EXE loaded, local file or device
bits 5-0: low six bits of device attribute word
---SHARE.EXE loaded, local file---
1Ah WORD starting cluster of file on disk
1Ch WORD (DOS 3.x) offset within SHARE of sharing record
(see #01614 at AH=52h)
1Eh BYTE file attribute
1Fh BYTE ???
---SHARE.EXE loaded, remote file---
1Ah WORD number of sector containing directory entry (see #01329)
1Ch WORD relative cluster within file of last cluster accessed
1Eh BYTE absolute cluster number of last cluster accessed
1Fh BYTE ???
---SHARE.EXE not loaded---
1Ah BYTE (low byte of device attribute word AND 0Ch) OR open mode
1Bh WORD starting cluster of file
1Dh WORD number of sector containing directory entry (see #01329)
1Fh BYTE number of directory entry within sector
Note: if FCB opened on character device, DWORD at 1Ah is set to the address
of the device driver header, then the BYTE at 1Ah is overwritten.
SeeAlso: #01623

Format of FCB reserved field for DOS 5.0:
Offset Size Description (Table 01328)
18h BYTE number of system file table entry for file
19h BYTE attributes
bits 7,6: 00 = SHARE.EXE not loaded, disk file
01 = SHARE.EXE not loaded, character device
10 = SHARE.EXE loaded, remote file
11 = SHARE.EXE loaded, local file or device
bits 5-0: low six bits of device attribute word
---SHARE.EXE loaded, local file---
1Ah WORD starting cluster of file on disk
1Ch WORD unique sequence number of sharing record
1Eh BYTE file attributes
1Fh BYTE unused???
---SHARE.EXE loaded, remote file---
1Ah WORD network handle
1Ch DWORD network ID
---SHARE not loaded, local device---
1Ah DWORD pointer to device driver header (see #01623)
1Eh 2 BYTEs unused???
---SHARE not loaded, local file---
1Ah BYTE extra info
bit 7: read-only attribute from SFT
bit 6: archive attribute from SFT
bits 5-0: high bits of sector number
1Bh WORD starting cluster of file
1Dh WORD low word of sector number containing directory entry
(see #01329)
1Fh BYTE number of directory entry within sector
--------D-2110-------------------------------
INT 21 - DOS 1+ - CLOSE FILE USING FCB
AH = 10h
DS:DX -> File Control Block (see #01322)
Return: AL = status
00h successful
FFh failed
Notes: a successful close forces all disk buffers used by the file to be
written and the directory entry to be updated
not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=16h,AH=3Eh
--------D-2111-------------------------------
INT 21 - DOS 1+ - FIND FIRST MATCHING FILE USING FCB
AH = 11h
DS:DX -> unopened FCB (see #01322), may contain '?' wildcards
Return: AL = status
00h successful
[DTA] unopened FCB for first matching file
FFh no matching filename, or bad FCB
Notes: the type of the returned FCB depends on whether the input FCB was a
normal or an extended FCB
the data returned in the DTA (disk transfer area) is actually the
drive number (or extended FCB header and drive number) followed by
the file's directory entry (see #01329); this format happens to be
compatible with an unopened FCB
for extended FCBs with search attribute 08h, the volume label (if any)
will be returned even if the current directory is not the root dir.
DOS 3.0+ also allows the '*' wildcard
the search FCB at DS:DX must not be modified if AH=12h will be used to
continue searching; DOS 3.3 has set the following parts of the FCB:
0Ch BYTE ???
0Dh WORD directory entry number of matching file
0Fh WORD cluster number of current directory
11h 4 BYTEs ???
15h BYTE drive number (1=A:)
this function is used by many copy protection schemes to obtain the
starting cluster of a file
BUG: under Windows95, if a .EXE program ("MZ" header) rather than a true
.COM calls this function from a DOS box, the ten bytes of the
directory entry from 0Ch to 15h may be filled with zeros rather than
the additional file times
SeeAlso: AH=12h,AH=1Ah,AH=4Eh,INT 2F/AX=111Bh

Format of DOS directory entry:
Offset Size Description (Table 01329)
00h 8 BYTEs blank-padded filename
first character is set to E5h for deleted files (05h for
pending delete files under Novell DOS / OpenDOS)
08h 3 BYTEs blank-padded file extension
0Bh BYTE attributes
0Ch 10 BYTEs (MS-DOS 1.0-6.22) reserved
(DR DOS) used to store file password / owner (see #01331)
(see also INT 21/AX=4302h)
(Novell DOS 7) DELWATCH data (see #01331)
(MS-DOS 7/Windows95) additional file times (see #01330)
16h WORD time of creation or last update (see #01642 at AX=5700h)
18h WORD date of creation or last update (see #01643 at AX=5700h)
1Ah WORD starting cluster number (see also AX=440Dh/CX=0871h)
(not set for MSDOS 7.1 and FAT32-capable versions of Windows95)
1Ch DWORD file size
SeeAlso: #01332,#02604,#02605

Format of MS-DOS 7/Windows95 additional file times:
Offset Size Description (Table 01330)
00h BYTE reserved
01h BYTE 10-millisecond units past creation time below
02h WORD file creation time
04h WORD file creation date
06h WORD last-access date
08h WORD (FAT32) high word of starting cluster number
Note: this data is stored beginning at offset 0Ch in a standard directory
entry
SeeAlso: #01329

Format of DR DOS 6/Novell DOS 7 additional file information:
Offset Size Description (Table 01331)
0Ch BYTE reserved (00h)
0Dh BYTE first character of original filename for deleted file
0Eh WORD encrypted file/directory password
10h WORD reserved (00h)
(Novell DOS 7 DELWATCH) original file time
cleared when file is undeleted or purged
12h WORD (DR DOS 6) file owner ID
(Novell DOS 7 DELWATCH) original file date
cleared when file is undeleted or purged
14h WORD single/multiuser file/directory access rights (see AX=4302h)
---deleted files---
16h WORD (Novell DOS 7 DELWATCH) time of deletion
18h WORD (Novell DOS 7 DELWATCH) date of deletion
Note: offsets are within the full directory entry
SeeAlso: #01329

Format of MS-DOS 7/Windows95 long-filename directory entry:
Offset Size Description (Table 01332)
00h BYTE LFN record sequence and flags
bits 5-0: sequence number
bit 6: set if last long-filename record for file
bit 7: set if file deleted
01h 10 BYTEs long filename, first part
0Bh BYTE 0Fh (otherwise impossible file attribute, used as signature)
0Ch BYTE reserved??? (00h)
0Dh BYTE checksum for short filename
0Eh 12 BYTEs long filename, second part
1Ah WORD first cluster number (always 0000h for LFN records)
1Ch 4 BYTEs long filename, third part
Notes: long-filename entries are always stored in the directory just prior
to the short-name entry for a file
multiple LFN records are used if the long filename does not fit into
a single record
the short-filename checksum byte is computed by adding up the
eleven bytes of the short filename, rotating the intermediate
sum right one bit before adding the next character
the long filename is encoded as 16-bit Unicode characters; for most
filenames, this appears in the directory as the ASCII character
followed by 00h
SeeAlso: #01329,INT 21/AX=5704h,INT 21/AH=71h
--------D-2112-------------------------------
INT 21 - DOS 1+ - FIND NEXT MATCHING FILE USING FCB
AH = 12h
DS:DX -> unopened FCB (see #01322)
Return: AL = status
00h successful
Disk Transfer Area filled with unopened FCB
FFh no more matching filenames
Note: (see AH=11h)
assumes that successful FindFirst executed on search FCB before call
SeeAlso: AH=1Ah,AH=4Fh,INT 2F/AX=111Ch
--------D-2113-------------------------------
INT 21 - DOS 1+ - DELETE FILE USING FCB
AH = 13h
DS:DX -> unopened FCB (see #01322), filename filled with template for
deletion ('?' wildcards allowed)
Return: AL = status
00h one or more files successfully deleted
FFh no matching files or all were read-only or locked
Notes: DOS 1.25+ deletes everything in the current directory (including
subdirectories) and sets the first byte of the name to 00h (entry
never used) instead of E5h if called on an extended FCB with
filename '???????????' and bits 0-4 of the attribute set (bits 1 and
2 for DOS 1.x). This may have originally been an optimization to
minimize directory searching after a mass deletion (DOS 1.25+ stop
the directory search upon encountering a never-used entry), but can
corrupt the filesystem under DOS 2+ because subdirectories are
removed without deleting the files they contain.
currently-open files should not be deleted
MS-DOS allows deletion of read-only files with an extended FCB, whereas
Novell NetWare, DR DOS 6, and Novell DOS 7/OpenDOS 7.01 do not
this function generates a trap "D" under OS/2 v4.x (Warp4) when called
on an HPFS partition with a wildcard in the filename; it operates
correctly on FAT partitions and when called without wildcards
SeeAlso: AH=41h,INT 2F/AX=1113h
--------D-2114-------------------------------
INT 21 - DOS 1+ - SEQUENTIAL READ FROM FCB FILE
AH = 14h
DS:DX -> opened FCB (see #01322)
Return: AL = status
00h successful
01h end of file (no data)
02h segment wrap in DTA
03h end of file, partial record read
Disk Tranfer Area filled with record read from file
Notes: reads a record of the size specified in the FCB beginning at the
current file position, then updates the current block and current
record fields in the FCB
if a partial record was read, it is zero-padded to the full size
not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=15h,AH=1Ah,AH=3Fh"DOS",INT 2F/AX=1108h
--------D-2115-------------------------------
INT 21 - DOS 1+ - SEQUENTIAL WRITE TO FCB FILE
AH = 15h
DS:DX -> opened FCB (see #01322)
Disk Tranfer Area contains record to be written
Return: AL = status
00h successful
01h disk full
02h segment wrap in DTA
Notes: writes a record of the size specified in the FCB beginning at the
current file position, then updates the current block and current
record fields in the FCB
if less than a full sector is written, the data is placed in a DOS
buffer to be written out at a later time
not supported by MS Windows 3.0 DOSX.EXE DOS extender
SeeAlso: AH=0Fh,AH=14h,AH=1Ah,AH=40h,INT 2F/AX=1109h
--------D-2116-------------------------------
INT 21 - DOS 1+ - CREATE OR TRUNCATE FILE USING FCB
AH = 16h
DS:DX -> unopened FCB (see #01322), wildcards not allowed
Return: AL = status
00h successful
FFh directory full or file exists and is read-only or locked
Notes: if file already exists, it is truncated to zero length
if an extended FCB is used, the file is given the attribute in the
FCB; this is how to create a volume label in the disk's root dir
not supported by MS Windows 3.0 DOSX.EXE DOS extender
(FAT32 drive) this function will only succeed for creating a volume
label; FAT32 does not support FCBs for file I/O
SeeAlso: AH=0Fh,AH=10h,AH=3Ch
--------D-2117-------------------------------
INT 21 - DOS 1+ - RENAME FILE USING FCB
AH = 17h
DS:DX -> modified FCB (see also #01322)
the old filename ('?' wildcards OK) is in the standard location
while the new filename ('?' wildcards OK, no drive) is stored
in the 11 bytes beginning at offset 11h
Return: AL = status
00h successfully renamed
FFh no matching files,file is read-only, or new name already exists
Notes: subdirectories may be renamed using an extended FCB with the
appropriate attribute, as may volume labels
DR DOS checks password attached with AX=4303h before permitting rename
SeeAlso: AH=0Fh,AH=13h,AX=4303h,AH=56h,INT 2F/AX=1111h