Floppy disk controller: Difference between revisions
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==Original specifications== | ==Original specifications== | ||
* [http://www.amc-os.com/developers/specifications/nec_uPD765B.pdf Nec uPD765B datasheet] | |||
* [http://www.amc-os.com/developers/specifications/intel_82072.pdf Intel 82072 datasheet] | |||
* [http://www.amc-os.com/developers/specifications/intel_82077aa.pdf Intel 82077AA datasheet] | |||
Revision as of 14:38, 30 August 2012
Introduction
The floppy disk controller is used to control up to 4 floppy disk drives.
In the PC computer, it was originally based on a Nec uPD765 chip. On the PC/AT, a register was added to inform the OS that the media changed, and several other registers were added in the PS/2 and Model30 computers. Enhanced controllers were then implemented, with new functions and support of perpendicular mode, generally based on the Intel 82077AA chip.