Appropriations for the procurement, installation, retention, maintenance, and operation of electronic data processing and information technology devices and software used by State agencies subject to subsection (e) of Section 1-15 of the Department of Innovation and Technology Act, the purchase of necessary supplies and equipment and accessories thereto, and all other expenses incident to the operation and maintenance of those electronic data processing and information technology devices and software are payable from the Technology Management Revolving Fund. However, no contract shall be entered into or obligation incurred for any expenditure from the Technology Management Revolving Fund until after the purpose and amount has been approved in writing by the Secretary of Innovation and Technology. Until there are sufficient funds in the Technology Management Revolving Fund (formerly known as the Statistical Services Revolving Fund) to carry out the purposes of this amendatory Act of 1965, however, the State agencies subject to subsection (b) of Section 1-30 of the Department of Innovation and Technology Act shall, on written approval of the Secretary of Innovation and Technology, pay the cost of operating and maintaining electronic data processing systems from current appropriations as classified and standardized in the State Finance Act.