Assembly Language Help (alang.hlp) (
Table of Contents;
Topic list)
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The pages on this site contain documentation for very old MS-DOS software,
purely for historical purposes.
If you're looking for up-to-date documentation, particularly for programming,
you should not rely on the information found here, as it will be woefully
out of date.
JMP Instruction
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────────────────────────────────────────────────────────────────────────────
11101011 disp (1)
──────────────────┬─────────────────────────┬───────────────────────────────
JMP label │ jmp SHORT exit │ 88/86 15
│ │ 286 7+m
│ │ 386 7+m
│ │ 486 3
──────────────────┴─────────────────────────┴───────────────────────────────
11101001 disp (2)*
──────────────────┬─────────────────────────┬───────────────────────────────
JMP label │ jmp close │ 88/86 15
│ jmp NEAR PTR distant │ 286 7+m
│ │ 386 7+m
│ │ 486 3
──────────────────┴─────────────────────────┴───────────────────────────────
11101010 disp (4)*
──────────────────┬─────────────────────────┬───────────────────────────────
JMP label │ jmp FAR PTR close │ 88/86 15
│ jmp distant │ 286 11+m,pm=23+m
│ │ 386 12+m,pm=27+m
│ │ 486 17,pm=19
──────────────────┴─────────────────────────┴───────────────────────────────
11111111 mod,100,r/m disp (0 or 2)
──────────────────┬─────────────────────────┬───────────────────────────────
JMP reg16 │ jmp ax │ 88/86 11
JMP reg32 │ │ 286 7+m
│ │ 386 7+m
│ │ 486 5
──────────────────┼─────────────────────────┼───────────────────────────────
JMP mem16 │ jmp WORD PTR [bx] │ 88/86 18+EA
JMP mem32 │ jmp table[di] │ 286 11+m
│ jmp DWORD PTR [si] │ 386 10+m
│ │ 486 5
──────────────────┴─────────────────────────┴───────────────────────────────
11111111 mod,101,r/m disp (4)
──────────────────┬─────────────────────────┬───────────────────────────────
JMP mem32 │ jmp fpointer[si] │ 88/86 24+EA
JMP mem48 │ jmp DWORD PTR [bx] │ 286 15+m,pm=26+m
│ jmp FWORD PTR [di] │ 386 12+m,pm=27+m
│ │ 486 13,pm=18
──────────────────┴─────────────────────────┴───────────────────────────────
* On the 80386/486, the displacement can be four bytes for near
jumps or six bytes for far jumps.
Timings for jumps through call or task gates are not shown, since
they are normally used only in operating systems.
80386/486 only. You can use DWORD PTR to specify near register-
indirect jumps or FWORD PTR to specify far register-indirect jumps.
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