To obtain personal property, when authorized by an affirmative vote of 2/3 of the members of the board, by lease, with or without an option to purchase, for a period not to exceed 5 years or by purchase under an installment contract extending over a period of not more than 5 years, with interest at a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract; provided that the term of guaranteed energy savings contracts as defined in Article 19b of the School Code may exceed 5 years. For the purpose of this Section, personal property shall include computer hardware and software and all equipment, fixtures, renovations, and improvements to existing facilities of the district necessary to accommodate computers.
     With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.