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Programming Floppy Disk Controllers [ ] [ ] [ ] [ ] The purpose of this document is to provide information related to programming the NEC µPD765 and the Intel 82072/7 Floppy Disk Controllers (FDCs), by use of the registers. The document is split into several sections: • • • • The PC usually uses the NEC µPD765 floppy disk controller. The AT can also incorporate an Intel 82072A controller, while the PS/2 uses an Intel 82077A. The µPD765 and the ROM code in the controller form a microcontroller, and this handles the majority of the work of the controller.

All PC compatibles have FDCs which are compatible with the controllers described in this document. This document describes the registers used to interface with the controller, and the commands which it recognises. There are a lot of delays involved in communicating with the controller. These delays are for a variety of reasons, including the time needed to spin up the drive motor, and the time taken to move the head to a new position and wait for it to settle in place.

When the drive motor is started up or the a seek is requested, there will be a delay until the drive is ready for the next command. An interrupt is issued by the hardware when it is ready for the next command, and this will tell you that the drive is ready for your command. Chinnari Pellikuthuru Daily Serial In Hindi.