Branch on overflow clear

Take a conditional branch if the V bit is reset (clear/0)

Table

BVC | Branch on Overflow Clear
================================================

                                 N V - B D I Z C
                                 - - - - - - - -

addressing       assembler    opc  bytes  cycles
------------------------------------------------
relative         BVC $nnnn    50     2     2 tp

p: +1 if page is crossed
t: +1 if branch is taken