What is INT 10H IN 8086?
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.
How does INT 10H work?
Among the functions associated with INT 10H are changing character or background color, clearing the screen, and changing the location of the cursor. – Chosen by putting a specific value in register AH. To change the video mode, use INT 10H with AH = 00 and AL = video mode. Text mode of 80 × 25 characters.
What is the function of INT 10H with AH 09h?
INT 10h / AH = 09h – write character and attribute at cursor position.
What is the function of 4Ch under INT 21h?
INT 21h function 4Ch is preferred. Action: Reads a character from the standard input device and echoes it to the standard output device. If no character is ready it waits until one is available.
What does int 0x10 do?
Each INT represents a functions family, where usually AH represents the function number. For example : INT 0x10 is used for screen manipulation.
What is int21h?
int 21h means, call the interrupt handler 0x21 which is the DOS Function dispatcher. the “mov ah,01h” is setting AH with 0x01, which is the Keyboard Input with Echo handler in the interrupt.
What does mov ah 4Ch mean?
MOV AH, 4CH means store (or “move”) the hexadecimal value 4C into register AH . In MS-DOS, invoking interrupt 21h while AH = 4Ch causes the current process to terminate and uses the value of register AL as the exit code of the process.
Why do we use mov ah 4Ch?
MOV AH, 4CH means store (or “move”) the hexadecimal value 4C into register AH . INT 21H means invoke the interrupt identified by the hexadecimal number 21 . In MS-DOS, invoking interrupt 21h while AH = 4Ch causes the current process to terminate and uses the value of register AL as the exit code of the process.
What is INT 21h stands for MCQ?
What is LEA instruction?
The LEA (Load Effective Address) instruction is a way of obtaining the address which arises from any of the Intel processor’s memory addressing modes. That is to say, if we have a data move like this: MOV EAX, it moves the contents of the designated memory location into the target register.
What does int21h mean?