GameBoy\Opcode::opcode29 PHP Method

    public static function opcode29(Core $core)
    {
        $core->registerE = $core->unsbtub($core->registerE - 1);
        $core->FZero = $core->registerE == 0;
        $core->FHalfCarry = ($core->registerE & 0xf) == 0xf;
        $core->FSubtract = true;
    }