OpCode Values for x86 Based Computers

 Last reviewed: November 17, 1995
Article ID: Q139839
The information in this article applies to:
  • Microsoft Windows NT operating system version 3.1
  • Microsoft Windows NT Advanced Server version 3.1
  • Microsoft Windows NT Workstation versions 3.5 and 3.51
  • Microsoft Windows NT Server versions 3.5 and 3.51

X86 Based machines may display STOP errors because of Opcode exceptions from the CPU. An error of this type usually causes STOP 0x7F. In the case of a STOP 0x7F, the first parameter contains the OpCode that caused the fault. The following is a list of the current Opcode exceptions which are reported by x86 CPUs. 

0x00000000               Divide by Zero Error
0x00000001               Debugger Interrupt
0x00000002               Nonmaskable Interrupt
0x00000003               Breakpoint
0x00000004               Interrupt on overflow (INTO)
0x00000005               Array boundary violation (BOUND)
0x00000006               Invalid Opcode
0x00000007               Coprocessor Not Available
0x00000008               Double Fault
0x00000009               Coprocessor Segment Overrun (reserved on 486)
0x0000000A               Invalid TSS
0x0000000B               Segment Not Present
0x0000000C               StackException
0x0000000D               General Protection
0x0000000E               Page Fault
0x0000000F               (RESERVED)
0x00000010                Coprocessor Error
0x00000011               Alignment check (486 only)
0x00000012-0x0000001F    (RESERVED)
0x00000020-0x000000FF    Available for External Interrupts via INTR Pin

KBCategory: kbother
KBSubcategory: ntgeneral
Additional reference words: 3.50 3.51 prodnt

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Last reviewed: November 17, 1995
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