Assembly-Guidebook

The JNZ Instruction

JNZ stands for Jump if Not Zero, It is set by CMP, SUB, ADD, TEST, AND, OR, XOR instructions. Example if ZF = 0 then jump.
OPERAND – label
Example:

include 'emu8086.inc'

    ORG 100h
    MOV AL, 00000111b ; AL = 7
    OR AL, 0    ; just set flags.
    JNZ label1
    PRINT 'zero.'
    JMP exit
  label1:
    PRINT 'not zero.'
  exit:
    RET