INT 21H (0x21) Function 57H (0x57 or 87) Get or set file date and time 58H (0x58 or 88) Get or set allocation strategy 59H (0x59 or 89) Get extended error Information

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INT 21H (0x21)

Function 57H (0x57 or 87) --> Get or set file date and time

Call with: If getting date and time
AH = 57H
AL = 00H
BX = handle

If setting date and time
AH = 57H
AL = 01H
BX = handle
CX = time

bits 00H-04H = 2-second increments (0-29)
bits 05H-0AH = minutes (0-59)
bits 0BH-0FH = hours (0-23)

DX = date

bits 00H-04H = day (1-31)
bits 05H-08H = month (1-12)
bits 09H-0FH = year (relative to 1980)

Returns: If function successful
Carry flag = clear
and, if called with AL = 00H
CX = time
DX = date

If function unsuccessful
Carry flag = set
AX = error code

Comments:

This function obtains or modifies the date and time stamp in the root directory entry of file.

INT 21H (0x21)

Function 58H (0x58 or 88) --> Get or set allocation strategy

Call with: If getting strategy code
AH = 58H
AL = 00H

If setting strategy code
AH = 58H
AL = 01H
BX = desired strategy code
00H = first fit
01H = best fit
02H = last fit


Returns: If function successful
Carry flag = clear
and, if called with AL = 00H
AX = current strategy code

If function unsuccessful
Carry flag = set
AX = error code

Comments:

Obtains or changes the code indicating the current MS-DOS strategy for allocating memory blocks. The default MS-DOS memory allocation strategy is First Fit (code 0).

In the First fit memory allocation, MS-DOS searches the available memory blocks from low address to high address, assigning the first one large enough to satisfy the block allocation request.

In case of Best fit allocation strategy, MS-DOS searches all available memory blocks and assigns the smallest available block that will satisfy the request, regardless of its position.

In the Last fit memory allocation strategy, MS-DOS searches the available memory blocks from high addresses to low addresses, assigning the highest one large enough to satisfy the block allocation request.

 

INT 21H (0x21)

Function 59H (0x59 or 89) --> Get extended error Information

Call with: AH = 59H
BX = 00H

Returns: AX = extended error code

Table of error codes has been given below:

Error Code

Error

01H

function number invalid

02H

file not found

03H

path not found

04H

too many open files

05H

access denied

06H

handle invalid

07H

memory control blocks destroyed

08H

insufficient memory

09H

memory block address invalid

0AH (10)

environment Invalid

0BH (11)

format invalid

0CH (12)

access code invalid

0DH (13)

data invalid

0EH (14)

unknown unit

0FH (15)

disk drive invalid

10H (16)

attempted to remove current directory

11H (17)

not same device

12H (18)

no more files

13H (19)

disk write-protected

14H (20)

unknown unit

15H (21)

drive not ready

16H (22)

unknown command

17H (23)

data error (CRC)

18H (24)

bad request structure length

19H (25)

seek error

1AH (26)

unknown media type

1BH (27)

sector not found

1CH (28)

printer out of paper

1DH (29)

write fault

1EH (30)

read fault

1FH (31)

general failure

20H (32)

sharing violation

21H (33)

lock violation

22H (34)

disk change invalid

23H (35)

FCB unavailable

24H (36)

sharing buffer exceeded

25H-31H

reserved

32H (50)

unsupported network request

33H (51)

remote machine not listening

34H (52)

duplicate name on network

35H (53)

network name not found

36H (54)

network busy

37H (55)

device no longer exists on network

38H (56)

net BIOS command limit exceeded

39H (57)

error in network adapter hardware

3AH (58)

incorrect response from network

3BH (59)

unexpected network error

3CH (60)

remote adapter incompatible

3DH (61)

print queue full

3EH (62)

not enough space for print file

3FH (63)

print file canceled

40H (64)

network name deleted

41H (65)

network access denied

42H (66)

incorrect network device type

43H (67)

network name not found

44H (68)

network name limit exceeded

45H (69)

net BIOS session limit exceeded

46H (70)

file sharing temporarily paused

47H (71)

network request not accepted

48H (72)

print or disk redirection paused

49H-4FH

reserved

50H (80)

file already exists

51H (81)

reserved

52H (82)

cannot make directory

53H (83)

fail on INT 24H (critical error)

54H (84)

too many redirections

55H (85)

duplicate redirection

56H (86)

invalid password

57H (87)

invalid parameter

58H (88)

network device fault

59H (89)

function not supported by network

5AH (90)

required system component not installed

BH = error class

01H

if out of resource (such as storage or handles)

02H

if not error, but temporary situation (such as locked region in file) that can be expected to end

03H

if authorization problem

04H

if internal error in system software

05H

if hardware failure

06H

if system software failure not the fault of the active process (such as missing configuration files)

07H

if application program error

08H

if file or item not found

09H

if file or item of invalid type or format

0AH (10)

if file or item locked

0BH (11)

if wrong disk in drive, bad spot on disk, or storage medium problem

0CH (12)

if item already exists

0DH (13)

unknown error

 

BL = recommend action

01H

Retry reasonable number of times, then prompt user to select abort or ignore

02H

retry reasonable number of times with delay between retries, then prompt user to select abort or ignore

03H

get correct information from user (typically caused  by incorrect file name or device specification)

04H

abort application with cleanup (i.e., terminate the program in as orderly a manner as possible: releasing locks, closing files, etc.)

05H

perform immediate exit without cleanup

06H

ignore error

07H

retry after user intervention to remove cause of error

 

CH = error locus
01H unknown
02H block device (disk or disk
emulator)
03H network
04H serial device
05H memory

ES: DI = ASCIIZ volume label of disk to
insert, if AX = 0022H (invalid disk
change)

Comments:

This function obtains detailed error information after a previous unsuccessful INT 21H function call, including the recommended remedial action.

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


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540
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