X86 interrupt vector table

1 -- notes about interrupt Vectors

1. Where is the interrupt vector table stored in the memory during system boot?
When the system is just booting, the memory size from 0x00000 to 0x0003ff is 1 kb, which is used to store the interrupt vector table. Each interrupt vector occupies 4 bytes and can store 256 interrupt vectors in total.
2. During system boot, in real mode, the address can only be 1 MB. Why should we use 4 bytes to address the interrupt?
I was wondering when I first saw it. We all know that during programming, the pointer is 4 bytes and can address 4 GB. Can we use less bytes in real mode? In fact, the actual mode memory address selection method is: Segment value * 16 + offset value, that is, the memory address. Of the four bytes, the two segment values and the two outer offset values are stored. Therefore, there are 4 bytes in total.

3. This document is written and compiled from the Internet. There are often conflicts between different documents. This will inevitably lead to some errors and will be revised later. 2 -- interrupt vector table

Memory Address (hexadecimal)	Corresponding vector number (hexadecimal)	Interrupted use
Basic interrupt vector
0x3c4-0x3ff	F1-FF	Unused
0x218-0x3c3	86-f0	The function of the Basic Interpreter is provided when the basic program is running.
0x200-0x217	80-85	Reserved for basic
0x1e0-0x1ff	78-7f	Unused
0x1dc-0x1df	77	Hardware interruption 15
0x1d8-0x1db	76	Hardware interruption 14
0x1d4-0x1d7	75	Hardware interruption 13
0x1d0-0x1d3	74	Hardware interruption 12
0x1cc-0x1cf	73	Hardware interruption 11
0x1c8-0x1cb	72	Hardware interruption 10
0x1c4-0x1c7	71	Hardware interruption 9
0x1c0-0x1c3	70	Hardware interruption
0x1a0-0x1bf	68-6f	Unused
0x180-0x19f	60-67	Units reserved for user programs
0x128-0x17f	4a-5f	Retained
0x124-0x127	49	Pointing to the keyboard enhancement service conversion table
0x120-0x123	48	PC, used to convert the PC's keyboard code into a standard keyboard code
0x11c-0x11f	47	Retained
DOS interrupt vector
0x118-0x11b	46	Second hard disk parameter block
0x114-0x117	45	Retained
0x110-0x113	44	PC, used to point to the low-resolution graph character parameter table
0x108-0x10f	42-43	Unused
0x104-0x107	41	Hard Disk parameter block
0x0c0-0x0cb	34-40	Unused
0x0cc-0x0cf	33	Mouse interruption
0x0c0-0x0cb	30-32	Unused
0x0bc-0x0bf	2f	Multi-channel service interruption
0x0b8-0x0bb	2e	Basic shell program loading
0x0ac-0x0b7	2b-2d	Unused
0x0a8-0x0ab	2a	Microsoft Network Interface
0x0a4-0x0a7	29	Fast character writing
0x0a0-0x0a3	28	DOS Security usage
0x09c-0x09f	27	Terminate and resident programs
0x098-0x09b	26	Absolute disk write function
0x094-0x097	25	Absolute disk read Function
0x090-0x093	24	Severe error handling (cannot be called directly)
0x08c-0x08f	23	CTRL + break processing address (cannot be called directly)
0x088-0x08b	22	DOS return address when the program is terminated (cannot be called directly)
0x084-0x087	21	Dossystem function call
0x080-0x083	20	DOS interrupt return
Data Table pointer
0x07c-0x07f	1f	Graphic character extended code
0x078-0x07b	1e	Floppy Disk parameter block
0x074-0x077	1D	Video parameter block
Interruptions provided to users
0x070-0x073	1c	Soft Interrupt of Timer control
0x06c-0x06f	1B	CTRL + break Soft Interrupt
BiOS interruption
0x068-0x06b	1a	Clock management
0x064-0x067	19	Boot Loader-system self-lifting
0x060-0x063	18	Basic entry code -- rom basic entry code
0x05c-0x05f	17	Printer output
0x058-0x05b	16	Keyboard I/O
0x054-0x057	15	Cartridge I/O
0x050-0x053	14	RS-232 serial communication port I/O
0x04c-0x04f	13	Disk I/O
0x048-0x04b	12	Memory Capacity Measurement
0x044-0x047	11	Device Inspection
0x040-0x043	10	Screen Display I/O
8259 interrupt vector
0x03c-0x03f	F	Lpt2 controller interrupt-parallel printer (irq7)
0x038-0x03b	E	Disk controller interruption-soft disk (irq6)
0x034-0x037	D	Lpt2 controller interrupt-hard disk (Parallel Port) (irq5)
0x030-0x033	C	Asynchronous Communication (primary) -- serial communication interface 1 (irq4)
0x02c-0x02f	B	Asynchronous Communication (secondary) -- serial communication interface 2 (irq3)
0x028-0x02b	A	Color/graphics (irq2)
0x024-0x027	9	Keyboard (irq1)
0x020-0x023	8	Timer (irq0)
8088 interrupt vector
0x01c-0x01f	7	Retained
0x018-0x01b	6	Retained
0x014-0x017	5	Print Screen
0x010-0x013	4	Overflow
0x00c-0x00f	3	Breakpoint command
0x008-0x00b	2	Unshielded interrupt
0x004-0x007	1	Single Step (for Debug)
0x000-0x003	0	Divide by zero