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back2root:ibm-pc-ms-dos:hardware:informations:irq
Table des matières
IRQs - Interrupts List
Intel Defined CPU Exception Table (see notes)
| Interrupt | Function |
|---|---|
| 0 | Divide by zero |
| 1 | Single step |
| 2 | Non-maskable (NMI) |
| 3 | Breakpoint |
| 4 | Overflow trap |
| 5 | BOUND range exceeded (186,286,386) |
| 6 | Invalid opcode (186,286,386) |
| 7 | Coprocessor not available (286,386) |
| 8 | Double fault exception (286,386) |
| 9 | Coprocessor segment overrun (286,386) |
| A | Invalid task state segment (286,386) |
| B | Segment not present (286,386) |
| C | Stack exception (286,386) |
| D | General protection exception (286,386) |
| E | Page fault (286,386) |
| F | Reserved |
| 10 | Coprocessor error (286,386) |
IBM PC Hardware Interrupt Table (in order of priority)
| IRQ# | errupt | Function |
|---|---|---|
| IRQ0 | 8 | timer (55ms intervals, 18.2 per second) |
| IRQ1 | 9 | keyboard service required |
| IRQ2 | A | slave 8259 or EGA/VGA vertical retrace |
| IRQ8 | 0 | real time clock (AT,XT286,PS50+) |
| IRQ9 | 1 | software redirected to IRQ2 (AT,XT286,PS50+) |
| IRQ10 | 2 | reserved (AT,XT286,PS50+) |
| IRQ11 | 3 | reserved (AT,XT286,PS50+) |
| IRQ12 | 4 | mouse interrupt (PS50+) |
| IRQ13 | 5 | numeric coprocessor error (AT,XT286,PS50+) |
| IRQ14 | 6 | fixed disk controller (AT,XT286,PS50+) |
| IRQ15 | 7 | reserved (AT,XT286,PS50+) |
| IRQ3 | B | COM2 or COM4 service required, (COM3-COM8 on MCA PS/2) |
| IRQ4 | C | COM1 or COM3 service required |
| IRQ5 | D | fixed disk or data request from LPT2 |
| IRQ6 | E | floppy disk service required |
| IRQ7 | F | data request from LPT1 (unreliable on IBM mono) |
Interrupt Table as Implemented by System BIOS/DOS
| INT # | Locus | Function |
|---|---|---|
| 0 | CPU | divide by zero |
| 1 | CPU | single step |
| 2 | CPU | non-maskable |
| 3 | CPU | breakpoint |
| 4 | CPU | overflow trap |
| 5 | BIOS | print screen |
| 6 | CPU | Invalid opcode (186,286,386) |
| 7 | CPU | coprocessor not available (286,386) |
| 8 | IRQ0 | timer (55ms intervals, 18.21590 per second) |
| 9 | IRQ1 | keyboard service required (see INT 9) |
| A | IRQ2 | slave 8259 or EGA/VGA vertical retrace |
| B | IRQ3 | COM2 service required (PS/2 MCA COM3-COM8) |
| C | IRQ4 | COM1 service required |
| D | IRQ5 | fixed disk or data request from LPT2 |
| E | IRQ6 | floppy disk service required |
| F | IRQ7 | data request from LPT1 (unreliable on IBM mono) |
| 10 | BIOS | video (see INT 10) |
| 11 | BIOS | Equipment determination (see INT 11) |
| 12 | BIOS | memory size (see INT 12) |
| 13 | BIOS | disk I/O service (see INT 13) |
| 14 | BIOS | serial communications (see INT 14) |
| 15 | BIOS | system services, cassette (see INT 15) |
| 16 | BIOS | keyboard services (see INT 16) |
| 17 | BIOS | parallel printer (see INT 17) |
| 18 | BIOS | ROM BASIC loader |
| 19 | BIOS | bootstrap loader (unreliable, see INT 19) |
| 1A | BIOS | time of day (see INT 1A) |
| 1B | BIOS | user defined ctrl-break handler (see INT 1B) |
| 1C | BIOS | user defined clock tick handler (see INT 1C) |
| 1D | BIOS | 6845 video parameter pointer |
| 1E | BIOS | diskette parameter pointer (base table) |
| 1F | BIOS | graphics character table |
| 20 | DOS | general program termination |
| 21 | DOS | function request services (see INT 21) |
| 22 | DOS | terminate address (see INT 22) |
| 23 | DOS | control break termination address (see INT 23) |
| 24 | DOS | critical error handler (see INT 24) |
| 25 | DOS | absolute disk read (see INT 25) |
| 26 | DOS | absolute disk write (see INT 26) |
| 27 | DOS | terminate and stay resident (see INT 27) |
| 28 | DOS | idle loop, issued by DOS when idle (see INT 28) |
| 29 | DOS | fast TTY console I/O (see INT 29) |
| 2A | DOS | critical section and NETBIOS (see INT 2A) |
| 2B | DOS | internal, simple IRET in DOS 2.0-5.0 |
| 2C | DOS | internal, simple IRET in DOS 2.0-5.0 |
| 2D | DOS | internal, simple IRET in DOS 2.0-5.0 |
| 2E | DOS | exec command from base level command interpreter (see INT 2E) |
| 2F | DOS | multiplexer (see INT 2F) |
| 30-31 | CPM | far jump vector for CPM (not an interrupt) |
| 31 | DPMI | DOS Protected Mode Interface (for DOS extenders) |
| 32 | reserved | |
| 33 | mouse support (see INT 33) | |
| 34-3E | Microsoft/Borland floating point emulation | |
| 3F | overlay manager | |
| 40 | BIOS | hard disk |
| 41 | BIOS | fixed disk 0 parameters pointer (see INT 13,9) |
| 42 | BIOS | relocated video handler (EGA/VGA/PS) |
| 43 | BIOS | user font table (EGA/VGA/PS) |
| 44 | BIOS | first 128 graphics characters (also Netware) |
| 45 | BIOS | reserved for BIOS |
| 46 | BIOS | fixed disk 1 parameters ptr (see INT 13,9/INT 41) |
| 47 | BIOS | reserved for BIOS |
| 48 | BIOS | PCjr cordless keyboard translation |
| 49 | BIOS | PCjr non-keyboard scancode translation table |
| 4A | BIOS | user alarm (AT,CONV,PS/2) (see INT 4A) |
| 4B-4F | BIOS | reserved |
| 50 | BIOS | periodic alarm from timer (PS/2) |
| 51-58 | BIOS | reserved |
| 59 | BIOS | GSS Computer Graphics Interface |
| 5A | BIOS | cluster adapter BIOS entry point |
| 5B | BIOS | cluster adapter boot |
| 5C | NETBIOS | NETBIOS interface, TOPS interface |
| 5D-5F | BIOS | reserved for BIOS |
| 60-67 | reserved for user software interrupts | |
| 67 | EMS | LIM/EMS specification (see INT 67) |
| 68 | APPC | |
| 69-6B | reserved by IBM | |
| 6C | DOS | DOS 3.2 real time clock update |
| BIOS | system resume vector | |
| 6D-6F | reserved | |
| 70 | IRQ8 | real time clock (AT,XT286,PS50+, see INT 15) |
| 71 | IRQ9 | software redirected to IRQ2 (AT,XT286,PS50+) |
| 72 | IRQ10 | reserved (AT,XT286,PS50+) |
| 73 | IRQ11 | reserved (AT,XT286,PS50+) |
| 74 | IRQ12 | mouse interrupt (PS50+) |
| 75 | IRQ13 | numeric coprocessor NMI error (AT,XT286,PS50+) |
| 76 | IRQ14 | fixed disk controller (AT,XT286,PS50+) |
| 77 | IRQ15 | reserved (AT,XT286,PS50+) |
| 78-79 | unused | |
| 80-85 | ROM BASIC | |
| 86-F0 | DOS | reserved for BASIC interpreter use |
| 86 | NETBIOS | NETBIOS relocated INT 18 |
| E0 | CPM | CP/M 86 function calls |
| F1-FF | reserved by IBM | |
| FE-FF | may be destroyed by return from protected mode using VDISK on 286 machines (Apr 86, DDJ) |
Notes
Intel defined 0 through 20h for use for internal CPU; IBM redefined interrupts 0 through 1Fh for its own use, hence the duplicate definitions in the tables
all interrupts except the internal CPU exceptions push the flags and the CS:IP of the next instruction onto the stack.
CPU exception interrupts are similar but push the CS:IP of the causal instruction. 8086/88 divide exceptions are different, they return to the instruction following the division
interrupts are disabled upon entry into any interrupt routine and should be enabled by the user or by an IRET
in DOS 3.2+ hardware IRQ interrupts are re-vectored through DOS to provide standard stack frames
Sous-catégories :
Pas de sous-catégories.
back2root/ibm-pc-ms-dos/hardware/informations/irq.txt · Dernière modification : 2024/04/07 23:48 de 213.180.203.28
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