(a) Unless the articles of incorporation or bylaws provide otherwise, regular meetings of the board of directors may be held without notice of the date, time, place, or purpose of the meeting.

(b) Special meetings of the board of directors shall be held upon such notice as is provided in the articles of incorporation or bylaws, or in the absence of any such provision, upon notice sent by any usual means of communication not less than five days before the meeting.  The notice need not describe the purpose of the special meeting unless required by this Chapter, the articles of incorporation or bylaws. (1955, c. 1371, s. 1; 1969, c. 751, s. 12; 1973, c. 469, s. 8; 1989, c. 265, s. 1.)