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Diskette Media Load Detection Algorithm for 5-1/4-Inch Diskette Technology Disclosure Number: IPCOM000034472D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27

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Crandall, DR Crouse, RS Lindeman, DF [+details]


This article describes a technique for detecting whether a medium has been inserted in a previously idle diskette drive. Many existing programs require a special interrupt from the system to alert them that a diskette has been inserted and the drive is ready. This interrupt was supplied by the 8-inch diskette technology. 5-1/4- inch diskette technology does not automatically supply this interrupt. Accordingly, the technique disclosed herein was developed to supply this interrupt so that existing programs would not have to be updated to accommodate the new diskette technology. Since the 5-1/4-inch diskette technology only informs the user that a diskette media has been inserted or removed, the task of finding out if the diskette media was inserted and the drive ready (meaning that the door had been closed) required solution.