Get 21h

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

Interrupt 21 Functions FuncPurposeInput02hDisplay OutputAH = 02h DL = character to send to standard output03hAuxiliary InputAH = 03h04hAuxiliary OutputAH = 04h DL = character to send05hPrinter OutputAH = 05h DL = character to print18 more rows

INT 21h / AH=1 - read character from standard input, with echo, result is stored in AL. if there is no character in the keyboard buffer, the function waits until any key is pressed. INT 21h / AH=2 - write character to standard output. entry: DL = character to write, after execution AL = DL.

INT 10h, INT 10H or INT 16 is shorthand for BIOS interrupt call 10hex, the 17th interrupt vector in an x86-based computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides video services.

Function 01H and 08H INT 21H: To read single character and have it echoed (displayed) on the screen, use the following code: MOV AH, 01H INT 21H ;AL contains now the ASCII code of the character read from the ;keyboard.

– INT 10H and INT 21H are the most widely used with various functions selected by the value in the AH register. INT 10H subroutines are burned into the ROM BIOS. – Used to communicate with the computer's screen video. Manipulation of screen text/graphics can be done via INT 10H.

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

# 09H- string display - Displays string until '$' is reached. - DX should have the address of the string to be displayed. # OBH- Check keyboard status - Returns FF in AL if input character is available in keyboard buffer.

Interrupt 21 Functions FuncPurposeInput02hDisplay OutputAH = 02h DL = character to send to standard output03hAuxiliary InputAH = 03h04hAuxiliary OutputAH = 04h DL = character to send05hPrinter OutputAH = 05h DL = character to print18 more rows

INT 21h / AH=1 - read character from standard input, with echo, result is stored in AL. if there is no character in the keyboard buffer, the function waits until any key is pressed. INT 21h / AH=2 - write character to standard output. entry: DL = character to write, after execution AL = DL.

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

INT 10h, INT 10H or INT 16 is shorthand for BIOS interrupt call 10hex, the 17th interrupt vector in an x86-based computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides video services.

Function 01H and 08H INT 21H: To read single character and have it echoed (displayed) on the screen, use the following code: MOV AH, 01H INT 21H ;AL contains now the ASCII code of the character read from the ;keyboard.

INT 21h - The general function despatcher Action:Clears the standard input buffer then invokes one of the standard input functions.Notes:The purpose of this function is to ignore any type-ahead data and force a wait for new character input which must occur after the call is issued.2 more rows

– INT 10H and INT 21H are the most widely used with various functions selected by the value in the AH register. INT 10H subroutines are burned into the ROM BIOS. – Used to communicate with the computer's screen video. Manipulation of screen text/graphics can be done via INT 10H.

its just like using a "cout" statement in C++ , mov ah,2 where 2 represents a. function call for printing a character on the screen and moving in ah and then "int 21h" causes your function (2) to be executed and whatever is in data register is to be printed.

# 09H- string display - Displays string until '$' is reached. - DX should have the address of the string to be displayed. # OBH- Check keyboard status - Returns FF in AL if input character is available in keyboard buffer.

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

INT 21h - The general function despatcher Action:Clears the standard input buffer then invokes one of the standard input functions.Notes:The purpose of this function is to ignore any type-ahead data and force a wait for new character input which must occur after the call is issued.2 more rows

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

its just like using a "cout" statement in C++ , mov ah,2 where 2 represents a. function call for printing a character on the screen and moving in ah and then "int 21h" causes your function (2) to be executed and whatever is in data register is to be printed.

int 21h is the second line of assembler code. The software interrupt 21h is called. This interrupt, when given the value of 4ch in AH (as is the case here), causes the program to exit immediately. END denotes the end of the program.

Character input with echo (INT 21H, Function 01H): Reads a character from the standard input device (usually the keyboard) and echoes it to the standard output device (usually the display screen), or waits until a character is available.

Character input with echo (INT 21H, Function 01H): Reads a character from the standard input device (usually the keyboard) and echoes it to the standard output device (usually the display screen), or waits until a character is available.