Intel IA-32 - Manual (Page 558)

15-8 Vol. 3A
8086 EMULATION
Table 15-1. Real-Address Mode Exceptions and Interrupts
Vector
No. Description
Real-Address
Mode
Virtual-8086
Mode
Intel 8086
Processor
0 Divide Error (#DE) Yes Yes Yes
1 Debug Exception (#DB) Yes Yes No
2 NMI Interrupt Yes Yes Yes
3 Breakpoint (#BP) Yes Yes Yes
4 Overflow (#OF) Yes Yes Yes
5 BOUND Range Exceeded (#BR) Yes Yes Reserved
6 Invalid Opcode (#UD) Yes Yes Reserved
7 Device Not Available (#NM) Yes Yes Reserved
8 Double Fault (#DF) Yes Yes Reserved
9 (Intel reserved. Do not use.) Reserved Reserved Reserved
10 Invalid TSS (#TS) Reserved Yes Reserved
11 Segment Not Present (#NP) Reserved Yes Reserved
12 Stack Fault (#SS) Yes Yes Reserved
13 General Protection (#GP)* Yes Yes Reserved
14 Page Fault (#PF) Reserved Yes Reserved
15 (Intel reserved. Do not use.) Reserved Reserved Reserved
16 Floating-Point Error (#MF) Yes Yes Reserved
17 Alignment Check (#AC) Reserved Yes Reserved
18 Machine Check (#MC) Yes Yes Reserved
19-31 (Intel reserved. Do not use.) Reserved Reserved Reserved
32-255 User Defined Interrupts Yes Yes Yes
NOTE:
* In the real-address mode, vector 13 is the segment overrun exception. In protected and virtual-8086
modes, this exception covers all general-protection error conditions, including traps to the virtual-
8086 monitor from virtual-8086 mode.