Changes
/* External links */
* From [https://hackaday.com/2012/08/13/taking-a-look-at-decapped-ics/#comment-734991 a comment in the hackaday website]: "Internally this is a microcoded part with a primative controller of NEC’s own design. Testing microcode embedded in a part can be troublesome. The uPD765 had a few extra gates associated with the DMA Request and DMA Ack pins. Presenting a certain illegal combination here places the part into a “test” mode and allows the sequencer microcode to be output on the normal Data pins. The sequencer microcode is responsible for high level commands such as Read Track, Recalibrate, Format Track, or Write Data. There is a similar test mode for the nano-code array which serializes data at the floppy disk head."
== FDC Block Diagram ==
[[File:FDC Intel 8272A block diagram.gif]]
[[File:UPD765A System Diagram.png]]
== 3-inch Floppy Drive Interface ==
[[File:Interface FDC - Floppy drive.png]]
== FDD Block Diagram ==
[[File:Floppy Disk Drive - Block Diagram.png]]
== Datasheets ==
* [[Media:UPD765_App_Note_Mar79.pdf| NEC uPD765 Datasheet preliminary (1979)]] [[Media:D765 NEC.pdf]] [[Media:UPD765-NEC.pdf]] [[Media:Z765A datasheet.pdf]] - uPD765 disc controller
* [https[Media://www.threedee.com/jcm/terak/docs/Intel%208272A%20Floppy%20Controller.pdf Intel 8272A Datasheet preliminary (1982).pdf]] [[Media:Datasheet.hk_d8272a_2873060.pdf|Intel 8272A Datasheet (1986)]] - Licensed clone of the uPD765
* [[Media:FDC9229BT Datasheet.pdf]] - FDC9229BT data separator
* [[Media:SED9420.pdf]] - SED9420C data separator
*[http://quasar.cpcscene.net/doku.php?id=assem:fdc Quasar FDC documentation (in french)]
*[https://64nops.wordpress.com/2021/07/04/a-la-decouverte-du-fdc/ FDC blog articles (in french)]
*[https://info-coach.fr/atari/hardware/FD-Hard.php Atari ST Floppy Disk hardware analysis]
[[Category:CPC Internal Components]][[Category:Programming]][[Category:DATA Storage]][[Category:Electronic Component]]
