Manav Goyal

8086 AL Commands - Microprocessor And Interfacing

INT VALUE

Take Character Input

    // Particular key will be stored in "AL" register
    MOV AH, 01H
    INT 21H

Print Character Output

    // Prints content of "AL" register
    MOV DL, 'A'
    MOV AH, 02H
    INT 21H

Take String Input & Output

    MSG DB "HELLO WORLD",'$'

    // Content is loaded from DX register
    LEA DX, MSG

    // Print a String
    MOV AH, 09H
    INT 21H

    // Input a String
    MOV AH, 0AH
    INT 21H

End Code Segment
```
    MOV AH, 4CH
    INT 21H
```

Clear Screen

    MOV AH, 00
    MOV AL, 02
    INT 10H

Place the Cursor

    MOV AH, 02 // Cursor Position
    MOV BH, 00 // Page Number
    MOV DH, N1 // Row
    MOV DL, N2 // Col
    INT 10H

Wait until a key is Pressed
```
    MOV AH, 01
    INT 16H
```

Boilerplate

    .MODEL SMALL       // Program uses maximum of 64K of memory for code
    .STACK 100         // Bytes of stack space for the program

    .DATA              // Beginning of data segment where variables are stored
        MSG DB "VALUE$"

    .CODE              // Beginning of code segment
        MOV AX,@DATA   // Referencing data segment with AX register
        MOV DS,AX

        MOV AH,4CH
        INT 21H
    END

Loop
- LOOP Label

Macro

    // Declaration
    macroName macro parameters
        // Macro Body
    endm

    // Calling
    macroName argument

    // Include
    include macroName.mac

Procedure

    // Declaration
    procName PROC
        // Procedure Body
        RET
    procName ENDP

    // Calling
    CALL procName

    // Include
    include procName.inc