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(nasm.info)Section B.4.128

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B.4.128. `Jcc': Conditional Branch
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     Jcc imm                       ; 70+cc rb             [8086]
     Jcc NEAR imm                  ; 0F 80+cc rw/rd       [386]

   The conditional jump instructions execute a near (same segment) jump
if and only if their conditions are satisfied. For example, `JNZ' jumps
only if the zero flag is not set.

   The ordinary form of the instructions has only a 128-byte range; the
`NEAR' form is a 386 extension to the instruction set, and can span the
full size of a segment. NASM will not override your choice of jump
instruction: if you want `Jcc NEAR', you have to use the `NEAR' keyword.

   The `SHORT' keyword is allowed on the first form of the instruction,
for clarity, but is not necessary.

   For details of the condition codes, see *Note Section B.2.2::.