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(nasm.info)Section B.4.122

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B.4.122. `INT': Software Interrupt
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     INT imm8                      ; CD ib                [8086]

   `INT' causes a software interrupt through a specified vector number
from 0 to 255.

   The code generated by the `INT' instruction is always two bytes long:
although there are short forms for some `INT' instructions, NASM does
not generate them when it sees the `INT' mnemonic. In order to generate
single-byte breakpoint instructions, use the `INT3' or `INT1'
instructions (see *Note Section B.4.123::) instead.