Interrupt table

摘录自：http://en.wikipedia.org/wiki/BIOS_interrupt_call

Interrupt table

A list of common BIOS interrupts can be found below. Note that some BIOSes (particularly old ones) will not support all of these interrupts.

Interrupt vector Description

​00h​

CPU: Executed after an attempt to divide by zero or when the quotient does not fit in the destination

​01h​

CPU: Executed after every instruction while the trace flag is set

​02h​

CPU: NMI , used e.g. by POST for memory errors

​03h​

CPU: The lowest non-reserved interrupt, it is used exclusively for debugging, and the ​INT 03​ handler is always implemented by a debugging program

​04h​

CPU: Numeric Overflow. Usually caused by the ​INTO​ instruction when the overflow flag is set.

​05h​

Executed when Shift-Print screen is pressed, as well as when the ​BOUND​ instruction detects a bound failure.

​06h​

CPU: Called when the Undefined Opcode (invalid instruction) exception occurs. Usually installed by the operating system.

​07h​

CPU: Called when an attempt was made to execute a floating-point instruction and no numeric coprocessor was available.

​08h​

IRQ0: Implemented by the system timing component; called 18.2 times per second (once every 55 ms) by the PIC

​09h​

IRQ1: Called after every key press and release (as well as during the time when a key is being held)

​0Bh​

IRQ3: Called by serial ports 2 and 4 (COM2/4) when in need of attention

​0Ch​

IRQ4: Called by serial ports 1 and 3 (COM1/3) when in need of attention

​0Dh​

IRQ5: Called by hard disk controller (PC/XT) or 2nd parallel port LPT2 (AT) when in need of attention

​0Eh​

IRQ6: Called by floppy disk controller when in need of attention

​0Fh​

IRQ7: Called by 1st parallel port LPT1 (printer) when in need of attention

​10h​

Video Services - installed by the BIOS or operating system; called by software programs ​AH​ Description

​00h​	Set Video Mode
​01h​	Set Cursor Shape
​02h​	Set Cursor Position
​03h​	Get Cursor Position And Shape
​04h​	Get Light Pen Position
​05h​	Set Display Page
​06h​	Clear/Scroll Screen Up
​07h​	Clear/Scroll Screen Down
​08h​	Read Character and Attribute at Cursor
​09h​	Write Character and Attribute at Cursor
​0Ah​	Write Character at Cursor
​0Bh​	Set Border Color
​0Eh​	Write Character in TTY Mode
​0Fh​	Get Video Mode
​13h​	Write String

​11h​

Installed by the BIOS; returns equipment list

​12h​

Installed by the BIOS or operating system; returns Conventional Memory Size

​13h​

Low Level Disk Services; installed by the BIOS or operating system; called by software programs ​AH​ Description

​00h​	Reset Disk Drives
​01h​	Check Drive Status
​02h​	Read Sectors From Drive
​03h​	Write Sectors To Drive
​04h​	Verify Sectors On Drive
​05h​	Format Track On Drive
​08h​	Get Drive Parameters
​09h​	Init Fixed Drive Parameters
​0Ch​	Seek To Specified Track
​0Dh​	Reset Fixed Disk Controller
​15h​	Get Drive Type
​16h​	Get Floppy Drive Media Change Status

​14h​

Routines for communicating via the serial port. Used by software programs. ​AH​ Description

​00h​	Serial Port Initialization
​01h​	Transmit Character
​02h​	Receive Character
​03h​	Status

​15h​

Miscellaneous (System services support routines) ​AH​ ​AL​ ​AX​ Description

​4Fh​			Keyboard Intercept
​83h​			Event Wait
​84h​			Read Joystick
​85h​			Sysreq Key Callout
​86h​			Wait
​87h​			Move Block
​88h​			Get Extended Memory Size
​C0h​			Get System Parameters
​C1h​			Get Extended BIOS Data Area Segment
​C2h​			Pointing Device Functions
​E8h​	​01h​	​E801h​	Get Extended Memory Size(Newer function, since 1994). Gives results for memory size above 64 Mb.
​E8h​	​20h​	​E820h​	Query System Address Map. The information returned from e820 supersedes what is returned from the older AX=E801h and AH=88h interfaces.

​16h​

Implemented by the BIOS or operating system. Provides routines to be called by software programs which communicate with the keyboard. ​AH​ Description

​00h​	Read Character
​01h​	Read Input Status
​02h​	Read Keyboard Shift Status
​10h​	Read Character Extended
​11h​	Read Input Status Extended
​12h​	Read Keyboard Shift Status Extended

​17h​

Print Services - used by software programs to communicate with the printer ​AH​ Description

​00h​	Print Character to Printer
​01h​	Initialize Printer
​02h​	Check Printer Status

​18h​

Execute Cassette BASIC: True IBM computers contain BASIC in the ROM to be interpreted and executed by this routine in the event of a boot failure (called by the BIOS)

​19h​

After POST this interrupt is used by BIOS to load the operating system.

​1Ah​

Real Time Clock Services - called by software programs to communicate with the RTC ​AH​ Description

​00h​	Read RTC
​01h​	Set RTC
​02h​	Read RTC Time
​03h​	Set RTC Time
​04h​	Read RTC Date
​05h​	Set RTC Date
​06h​	Set RTC Alarm
​07h​	Reset RTC Alarm

​1Bh​

Installed by the operating system; automatically called by ​INT 9​ when Ctrl-Break has been pressed

​1Ch​

Called automatically by ​INT 08​ ; available for use by software programs when a routine needs to be executed regularly

​1Dh​

Not to be called; simply a pointer to the VPT (Video Parameter Table), which contains data on video modes

​1Eh​

Not to be called; simply a pointer to the DPT (Diskette Parameter Table), containing a variety of information concerning the diskette drives

​1Fh​

Not to be called; simply a pointer to the VGCT (Video Graphics Character Table), which contains the data for ASCII characters ​80h​ to ​FFh​

​41h​

Address pointer: FDPT = Fixed Disk Parameter Table (1st hard drive)

​46h​

Address pointer: FDPT = Fixed Disk Parameter Table (2nd hard drive)

​4Ah​

Called by RTC for alarm

​70h​

IRQ8: Called by RTC

​74h​

IRQ12: Called by mouse

​75h​

IRQ13: Called by math coprocessor

​76h​

IRQ14: Called by primary IDE controller

​77h​

IRQ15: Called by secondary IDE controller