BNE                   BNE Branch on result not zero                   BNE

  Operation:  Branch on Z = 0                           N V - B D I Z C
                                                        . . . . . . . .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Relative      |   BNE $FFFF           |   $D0   |    2    |    2*    |
  +----------------+-----------------------+---------+---------+----------+
  * Add 1 if branch occurs to same page.
  * Add 2 if branch occurs to different page (see explanation).

What it does: Branches up to 127 bytes forward or 128 bytes backward from its own address if the zero flag is clear. In other words, it branches if the result of the most recent event is not zero, as in: LDA #150: SBC #120 or LDA #128: CMP #125. These actions would clear the Z flag, signifying that a result was not 0.

Major uses: The reverse of BEQ. BNE means Branch if Not Equal. Since a CMP subtracts one number from another to perform its comparison, a 0 result means that they are equal. Any other result will trigger a BNE (not equal). Like the other B branch instructions, it has uses in IF-THEN, ONGOTO type structures and is used as a way to exit loops (for example, BNE will branch back to the start of a loop until a 0 delimiter is encountered at the end of a text message). BNE is like BASIC's <> instruction.