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back2root:ibm-pc-ms-dos:hardware:irq
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IRQ - int table
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# | Interrupt | Function |
|---|---|---|
| IRQ0 | 8 | <A HREF=“8253.html”>timer</A> (55ms intervals, 18.2 per second) |
| IRQ1 | 9 | keyboard service required |
| IRQ2 | A | slave <A HREF=“8259.html”>8259</A> or EGA/VGA vertical retrace |
| IRQ8 | 70 | real time clock (AT,XT286,PS50+) |
| IRQ9 | 71 | software redirected to IRQ2 (AT,XT286,PS50+) |
| IRQ10 | 72 | reserved (AT,XT286,PS50+) |
| IRQ11 | 73 | reserved (AT,XT286,PS50+) |
| IRQ12 | 74 | mouse interrupt (PS50+) |
| IRQ13 | 75 | numeric coprocessor error (AT,XT286,PS50+) |
| IRQ14 | 76 | fixed disk controller (AT,XT286,PS50+) |
| IRQ15 | 77 | 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 | <A HREF=“8253.html”>timer</A> (55ms intervals, 18.21590 per second) |
| 9 | IRQ1 | keyboard service required (see <A HREF=“int_9.html”>INT 9</A>) |
| A | IRQ2 | slave <A HREF=“8259.html”>8259</A> 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 <A HREF=“int_10.html”>INT 10</A>) |
| 11 | BIOS | Equipment determination (see <A HREF=“int_11.html”>INT 11</A>) |
| 12 | BIOS | memory size (see <A HREF=“int_12.html”>INT 12</A>) |
| 13 | BIOS | disk I/O service (see <A HREF=“int_13.html”>INT 13</A>) |
| 14 | BIOS | serial communications (see <A HREF=“int_14.html”>INT 14</A>) |
| 15 | BIOS | system services, cassette (see <A HREF=“int_15.html”>INT 15</A>) |
| 16 | BIOS | keyboard services (see <A HREF=“int_16.html”>INT 16</A>) |
| 17 | BIOS | parallel printer (see <A HREF=“int_17.html”>INT 17</A>) |
| 18 | BIOS | ROM BASIC loader |
| 19 | BIOS | bootstrap loader (unreliable, see <A HREF=“int_19.html”>INT 19</A>) |
| 1A | BIOS | time of day (see <A HREF=“int_1a.html”>INT 1A</A>) |
| 1B | BIOS | user defined ctrl-break handler (see <A HREF=“int_1b.html”>INT 1B</A>) |
| 1C | BIOS | user defined clock tick handler (see <A HREF=“int_1c.html”>INT 1C</A>) |
| 1D | BIOS | <A HREF=“6845.html”>6845</A> 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 <A HREF=“int_21.html”>INT 21</A>) |
| 22 | DOS | terminate address (see <A HREF=“int_22.html”>INT 22</A>) |
| 23 | DOS | control break termination address (see <A HREF=“int_23.html”>INT 23</A>) |
| 24 | DOS | critical error handler (see <A HREF=“int_24.html”>INT 24</A>) |
| 25 | DOS | absolute disk read (see <A HREF=“int_25.html”>INT 25</A>) |
| 26 | DOS | absolute disk write (see <A HREF=“int_26.html”>INT 26</A>) |
| 27 | DOS | terminate and stay resident (see <A HREF=“int_27.html”>INT 27</A>) |
| 28 | DOS | idle loop, issued by DOS when idle (see <A HREF=“int_28.html”>INT 28</A>) |
| 29 | DOS | fast TTY console I/O (see <A HREF=“int_29.html”>INT 29</A>) |
| 2A | DOS | critical section and NETBIOS (see <A HREF=“int_2a.html”>INT 2A</A>) |
| 2B | DOS | internal, simple <A HREF=“iret.html”>IRET</A> 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 <A HREF=“int_2e.html”>INT 2E</A>) | ||
| 2F | DOS | multiplexer (see <A HREF=“int_2f.html”>INT 2F</A>) |
| 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 <A HREF=“int_33.html”>INT 33</A>) | |
| 34-3E | Microsoft/Borland floating point emulation | |
| 3F | overlay manager | |
| 40 | BIOS | hard disk |
| 41 | BIOS | fixed disk 0 parameters pointer (see <A HREF=“int_13-9.html”>INT 13,9</A>) |
| 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 <A HREF=“int_13-9.html”>INT 13,9</A>/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 <A HREF=“int_4a.html”>INT 4A</A>) |
| 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 <A HREF=“int_67.html”>INT 67</A>) |
| 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 <A HREF=“int_15.html”>INT 15</A>) |
| 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) |
- 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 <A HREF=“iret.html”>IRET</A>
- in DOS 3.2+ hardware IRQ interrupts are re-vectored through DOS to provide standard stack frames
back2root/ibm-pc-ms-dos/hardware/irq.1673043790.txt.gz · Dernière modification : 2023/01/06 23:23 de frater
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