Contents
- 1 What is the function of INT 10H with ah 09h?
- 2 What is the function of INT 10H interrupt with AH 02h?
- 3 What is the function of 01h of INT 21h?
- 4 How do you use INT 21H?
- 5 What is the meaning of int 03h instruction?
- 6 What is the use of INT 3h instruction?
- 7 What kind of interrupt handler does BIOS use?
- 8 What does INT 10h / Ah mean in DOS?
What is the function of INT 10H with ah 09h?
Interrupt number 10h (INT 10h)
| INT 10h Service no. 09h | Inputs any |
|---|---|
| AH=09h; write Character and attribute at cursor position | input AL =Character to Display. BH =page number. BL =attribute. CX =number of times to write Character. |
What does INT 10H do?
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.
What is the function of INT 10H interrupt with AH 02h?
Int 10h functions
| Function Number | Description |
|---|---|
| AH=01h | Set text-mode cursor shape |
| AH=02h | Set cursor position |
| AH=03h | Get cursor position and shape |
| AH=04h | Read light pen position (Does not work on VGA systems) |
What is INT 21H and INT 10H?
Use INT 10H function calls to: – Clear the screen. – Set the cursor position. – Write characters to the screen in text mode. Use INT 21H function calls to: – Input characters from the keyboard. – Output characters to the screen.
What is the function of 01h of INT 21h?
This simply means that you are using function 01h of the Interrupt type 21… where 01h is as you said is to 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.
What is the meaning of INT 03h instruction?
The INT3 instruction is a one-byte-instruction defined for use by debuggers to temporarily replace an instruction in a running program in order to set a code breakpoint. The more general INT XXh instructions are encoded using two bytes.
How do you use INT 21H?
INT 21H will generate the software interrupt 0x21 (33 in decimal), causing the function pointed to by the 34th vector in the interrupt table to be executed, which is typically an MS-DOS API call. This simply means that you are using function 01h of the Interrupt type 21…
What is the function of 01h of INT 21H?
What is the meaning of int 03h instruction?
What does int21h mean?
Solution: 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 is the use of INT 3h instruction?
The INT 3 instruction generates a special one byte opcode (CC) that is intended for calling the debug exception handler. (This one byte form is valuable because it can be used to replace the first byte of any instruction with a breakpoint, including other one byte instructions, without over-writing other code).
What is the shorthand for BIOS interrupt call 10?
INT 10h, INT 10H or INT 16 is shorthand for BIOS interrupt call 10, the 17th interrupt vector in an x86-based computer system.
What kind of interrupt handler does BIOS use?
The BIOS typically sets up a real mode interrupt handler at this vector that provides video services. Such services include setting the video mode, character and string output, and graphics primitives (reading and writing pixels in graphics mode).
What do BH and CX mean in BIOS?
With these, make Start>End (e.g. CX=0706h) BH = Background Color and Foreground color. BH = 43h, means that background color is red and foreground color is cyan. Refer the BIOS color attributes
What does INT 10h / Ah mean in DOS?
INT 10h/ AH = 06h- scroll up window. INT 10h/ AH = 07h- scroll down window. input: AL= number of lines by which to scroll (00h = clear entire window).