INTERNE Funktion 21H (0x21) 44H (0x44 oder 68), Vorfunktion 0CH (0x0C oder 12) Input/Output Ctrl generische I/O Steuerung für Buchstabe Vorrichtungen 44H (0x44 oder 68 (0x0D oder 13) Vorrichtungen des Blockes 0DH 44H (0x44 oder 68) 0EH (0x0E oder 14) erhalten 44H (0x44 oder 68 0FH (0x0F oder 15) stellen logisches Antrieb Diagramm 45H ein (0x45 oder 69), das doppelte 46H (0x46 oder 70) Handgriff 47H (0x47 oder 71) erhalten aktuelles Verzeichnis umadressieren

INTERNES 21H (0x21)

Funktion 44H (0x44 oder 68), Vorfunktion 0CH (0x0C oder 12) Input/Output Ctrl  generische I/O Steuerung für Buchstabe Vorrichtungen

Call with: AH = 44H
AL = 0CH
BX = handle

CH =Kategorie (Haupt) Code:

CL                   =          Funktion (kleiner) Code:

DS: DX = segment: offset of parameter block

Returns: If function successful
Carry flag = clear
And if called with CL = 65H, 6AH, 6BH or 7FH
DS: DX = segment: offset of parameter block

If function unsuccessful
Carry flag = set
AX = error code

Comments:

It provides a general-purpose mechanism for communication between application programs and character-device drivers.

INTERNES 21H (0x21)

Funktion 44H (0x44 oder 68), Vorfunktion 0DH (0x0D oder 13) Input/Output Ctrl --> generische I/O Steuerung für Blockvorrichtungen

Call with: AH = 44H
AL = 0DH
BL = drive code (0 =default, 1=A,
2=B, etc.)
CH = category (major) code:
08H = disk drive
CL = function (minor) code:

DS: DX = segment: offset of parameter block

Returns: If function successful
Carry flag = clear
And if called with CL = 60H or 61H
DS: DX = segment: offset of parameter block

If function unsuccessful
Carry flag = set
AX = error code

Comments:

This sub function provides a general-purpose mechanism for communication between application programs and block-device drivers. Allows a program to inspect or change device parameters for a logical drive and to read, write, format, and verify disk tracks in a hardware-independent manner.

INTERNES 21H (0x21)

Funktion 44H (0x44 oder 68), Vorfunktion 0EH (0x0E oder 14) Input/Output Ctrl --> > logisches Antrieb Diagramm erhalten

Call with: AH = 44H
AL = 0EH
BL = drive code (0 = default, 1=A,
2=B, etc.)

Returns: If function successful
Carry flag = clear
AL = mapping code
00H, if only one logical drive code
assigned to the block device
01H-1AH logical drive code (1=A,
2=B, etc.) mapped to the block device

If function unsuccessful
Carry flag = set
AX = error code

Comments:

It returns the logical drive code that was most recently used to access the specified block drive.

INTERNES 21H (0x21)

Funktion 44H (0x44 oder 68), Vorfunktion 0FH (0x0F oder 15) Input/Output Ctrl --> gesetztes logisches Antrieb Diagramm

Call with: AH = 44H
AL = 0FH
BL = drive code (0 = default, 1=A,
2=B, etc.)

Returns: If function successful
Carry flag = clear
AL = mapping code
00H, if only one logical drive code
assigned to the block device

01H-1AH, logical drive code (1=A,
2=B, etc.) mapped to the
block device

If function unsuccessful
Carry flag = set
AX = error code

Comments:

This sub function sets the next logical drive code that will be used to reference a block device.

INTERNES 21H (0x21)

Funktion 45H (0x45 oder 69) --> Doppelter Handgriff

Call with: AH = 45H
BX = handle to be duplicated

Returns: If function successful
Carry flag = clear
AX = new handle

If function unsuccessful
Carry flag = set
AX = error code

Comments:

This function returns a new handle that refers to the same device or file at the same position for given handle for a currently open device or file.

INTERNES 21H (0x21)

Funktion 46H (0x46 oder 70) --> Handgriff umadressieren

Call with: AH = 46H
BX = handle for file or device
CX = handle to be redirected

Returns: If function successful
Carry flag = clear

If function unsuccessful
Carry flag = set
AX = error code

Anmerkungen:

Wenn es zwei gegebene Handgriffe gibt, beziehen sich diese Funktion Marken der zweite Handgriff die gleiche Vorrichtung oder auf Akte an der gleichen Position, die der erste Handgriff. Der zweite Handgriff wird dann gesagt umadressiert zu werden.

INTERNES 21H (0x21)

Funktion 47H (0x47 oder 71) --> Aktuelles Verzeichnis erhalten

Call with: AH = 47H
DL = drive code (0 =default, 1=A,
2=B, etc.)
DS: SI = segment: offset of 64-byte buffer

Returns: If function is successful
Carry flag = clear
And buffer is filled in with full pathname from root of current directory.

If function is unsuccessful
Carry flag = set
AX = error code

Comments:

This function obtains an ASCIIZ string that describes the path from the root to the current directory, and the name of that directory.

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