| Interrupted |
Description |
| Int 00 h |
CPU: triggered when division is zero or the provider is invalid |
| Int 01 H |
CPU: One-Step trap. When TF is marked as open, each command is triggered after execution. |
| Int 02 h |
CPU: unshielded interruptions. If a memory error occurs during self-testing. |
| Int 03 h |
CPU: The first undefined interrupt vector, which is generally used only for program debugging. |
| Int 04 H |
CPU: computing overflow. It is usually triggered by the into command when the overflow bit is set. |
| Int 05 h |
Triggered when a range exception is detected by pressing shift-print screen or bound. |
| Int 06 h |
CPU: Invalid Command. |
| Int 07 h |
CPU: If there is no math coprocessor, an attempt to execute a floating point command is triggered. |
| Int 08 h |
Irq0: the programmable interrupt controller is triggered every 55 milliseconds, that is, 18.2 times per second. |
| Int 09 h |
Irq1: Press, hold, and release the keyboard each time. |
| Int 0ah |
Irq2: |
| Int 0bh |
Irq3: com2/com4. |
| Int 0ch |
Irq4: COM1/com3. |
| Int 0dh |
Irq5: hard disk controller (under PC/XT) or lpt2. |
| Int 0eh |
Irq6: called by the disk controller when needed. |
| Int 0fh |
Irq7: LPT1. |
| Int 10 h |
Display service-set by BIOS or operating system for software calls.
| Ah = 00 h |
Set Display Mode |
| Ah = 01 H |
Set the cursor format |
| Ah = 02 h |
Set the cursor position |
| Ah = 03 h |
Obtain the cursor position and form |
| Ah = 04 H |
Obtain the pen position |
| Ah = 05 h |
Set display page |
| Ah = 06 h |
Clear or scroll screen (upper) |
| Ah = 07 h |
Clear or scroll screen (bottom) |
| Ah = 08 h |
Read the characters and attributes at the cursor |
| Ah = 09 h |
Changing the characters and attributes at the cursor |
| Ah = 0ah |
Change the character at the cursor |
| Ah = 0bh |
Set the border color |
| Ah = 0eh |
Write characters in tty Mode |
| Ah = 0fh |
Get current display mode |
| Ah = 13 H |
Write string |
|
| Int 11 h |
Return to the device list. |
| Int 12 h |
Obtain the general memory capacity. |
| INT 13 H |
Low-level Disk Service.
| Ah = 00 h |
Reset the disk drive. |
| Ah = 01 H |
Check the disk drive status. |
| Ah = 02 h |
Read sector. |
| Ah = 03 h |
Write sector. |
| Ah = 04 H |
Verify the slice. |
| Ah = 05 h |
Format the track. |
| Ah = 08 h |
Obtain the drive parameters. |
| Ah = 09 h |
Initialize hard drive parameters. |
| Ah = 0ch |
Seek. |
| Ah = 0dh |
Reset the hard disk controller. |
| Ah = 15 h |
Obtain the drive type. |
| Ah = 16 h |
Obtains the status of the disk. |
|
| Int 14 h |
Serial Communication routine.
| Ah = 00 h |
Initialize the serial port. |
| Ah = 01 H |
Write characters. |
| Ah = 02 h |
Read characters. |
| Ah = 03 h |
Status. |
|
| Int 15 h |
Others (system support routines ).
| Ah = 4fh |
Keyboard interception. |
| Ah = 83 H |
Event wait. |
| Ah = 84 h |
Read the game rod. |
| Ah = 85 H |
The sysrq key. |
| Ah = 86 H |
Wait. |
| Ah = 87 h |
Block Movement. |
| Ah = 88 h |
Obtain the extended memory capacity. |
| Ah = c0h |
Obtain system parameters. |
| Ah = c1h |
Obtain the extended BIOS data segment. |
| Ah = c2h |
Pointer device function. |
| Ah = e8h, Al = 01 H (AX = e801h) |
Get the extended memory capacity (new features introduced since 1944), and get the memory capacity of more than 64 MB. |
| Ah = e8h, Al = 20 h (AX = e820h) |
Query System address ing. This function replaces AX = e801h and Ah = 88 h. |
|
| Int 16 h |
Keyboard communication routine.
| Ah = 00 h |
Read characters. |
| Ah = 01 H |
Read input status. |
| Ah = 02 h |
Read Shift key (modify key) status. |
| Ah = 10 h |
Read characters (enhanced version ). |
| Ah = 11 h |
Read input status (enhanced version ). |
| Ah = 12 h |
Read Shift key (modify key) status (enhanced version ). |
|
| Int 17 h |
Print Service.
| Ah = 00 h |
Print characters. |
| Ah = 01 H |
Initialize the printer. |
| Ah = 02 h |
Check the printer status. |
|
| Int 18 h |
Run the BASIC program on the tape: the "real" IBM compatible machine has a built-in BASIC Program in the Rom. When the boot fails, the BIOS calls this routine to explain the execution. (For example, print prompts such as "boot disk error. Replace disk and press any key to continue) |
| Int 19 h |
After power-on self-check, load it into the operating system. |
| Int 1ah |
Real-time clock service.
| Ah = 00 h |
Read the real clock. |
| Ah = 01 H |
Set the real clock. |
| Ah = 02 h |
Read real-time clock. |
| Ah = 03 h |
Set the real-time clock. |
| Ah = 04 H |
Read the real-time clock date. |
| Ah = 05 h |
Set the real-time clock date. |
| Ah = 06 h |
Set real-time clock alarms. |
| Ah = 07 h |
Reset the real-time clock. |
|
| Int 1bh |
CTRL + break, automatically called by IRQ 9. |
| Int 1ch |
Reserved, automatically called by IRQ 8. |
| Int 1dh |
Not callable: pointer to the video parameter table (including the video mode data. |
| Int 1eh |
Not callable: pointer to the floppy disk mode table (containing a large amount of information about the floppy disk. |
| Int 1fh |
Not callable: information pointing to the video image sequence table (containing ASCII characters from 80 h to FFH. |
| Int 41 h |
Address pointer: Hard Disk parameter table (first hard disk ). |
| Int 46 h |
Address pointer: Hard Disk parameter table (second hard disk ). |
| Int 4ah |
The real clock is called when an alarm is triggered. |
| Int 70 h |
Irq8: called by the real clock. |
| Int 74 h |
Irq12: called by the mouse |
| Int 75 h |
Irq13: called by the mathematical coprocessor. |
| Int 76 H |
Irq14: called by the first ide Controller |
| Int 77 H |
Irq15: called by the second ide Controller |
