What does INT 16H do?

What does INT 16H do?

INT 16h, INT 16H or INT 22 is shorthand for BIOS interrupt call 16hex, the 22nd interrupt vector in an x86-based computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides keyboard services. This interruption is responsible for control of the PC keyboard.

What are keyboard scan codes?

A scancode (or scan code) is the data that most computer keyboards send to a computer to report which keys have been pressed. A number, or sequence of numbers, is assigned to each key on the keyboard.

Why do we use int 10H in assembly language?

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 key number is f12?

123
Keycode values

Key Code
f9 120
f10 121
f11 122
f12 123

What is INT 21h & INT 10H?

Use INT 10H function calls to: – Clear the screen. Use INT 21H function calls to: – Input characters from the keyboard. – Output characters to the screen.

What is the function of INT 10H with AH 09h?

List of supported functions

Function Function code Return
Read character and attribute at cursor position AH=08h AH = Color, AL = Character
Write character and attribute at cursor position AH=09h
Write character only at cursor position AH=0Ah
Set background/border color AH=0Bh, BH = 00h

What is the use of F6?

F6 – Moves the cursor to the address bar in most Internet browsers. F7 – Used to spell check and grammar check a document in Microsoft Apps (e.g. Word). F8 – Used to access the boot menu in Windows when turning on the computer.

Where can I find scan codes for the INT 16h keyboard?

5.1: INT 16H KEYBOARD PROGRAMMING keyboard scan codes See the scan code tables on pages 162 -163 of your textbook. • Each key is associated with a scan code.

How to translate the INT 16h code to another language?

The standard encoding of the keyboard that offers the INT 16 h is a US keyboard. To adapt the coding of the INT 16h to another type of keyboard (for example, a Hebrew keyboard), the code must analyze the scan-code of the key pressed, and then perform suitable interpreting.

How do I use INT 16h and INT 33h?

• Code Assembly language instructions using INT 16H to get and check the keyboard input buffer and status bytes. • Code Assembly language instructions for key press and detection. • Use INT 33H to control mouse functions in text and graphics modes.

Which key is associated with a scan code?

• Each key is associated with a scan code. The x86 PC Assembly Language, Design, and Interfacing By Muhammad Ali Mazidi, Janice Gillespie Mazidi and Danny Causey © 2010, 2003, 2000, 1998 Pearson Higher Education, Inc. Pearson Prentice Hall -Upper Saddle River, NJ 07458