Changes
/* Internal Block Diagram */
Usually single sided 40-track 3" disk drives are used in CPCs. For practical purposes, 42 tracks could be used — the limit is specific to the drive and some support more tracks but 42 is a good maximum. The FDC controller can be used to control 80-tracks and/or double sided drives, though AMSDOS doesn't support such formats. AMSDOS supports a maximum of two disk drives only.
== MFM track format FDC Track Format ==[[File:Mfm-format pd765aFDC765 Track Format.png]]
== Internal details of the chip ==
== Block Diagram ==
[[File:FDC Intel 8272A block diagram.gif]]
== Generic System Diagram ==
The Amstrad CPC and Amstrad Plus do not have a DMA controller associated with the FDC. The INT pin of the FDC is not connected either.
[[File:UPD765A System Diagram.png]]
== Floppy Drive Interface ==
[[File:Interface FDC - Floppy drive.png]]
== Datasheets ==
* [[Media:UPD765_App_Note_Mar79.pdf| NEC uPD765 Datasheet preliminary (1979)]] [[Media:D765 NEC.pdf]] [[Media:UPD765-NEC.pdf]] - uPD765 disc controller
* [https://www.threedee.com/jcm/terak/docs/Intel%208272A%20Floppy%20Controller.pdf Intel 8272A Datasheet preliminary (1982)] [[Media:Datasheet.hk_d8272a_2873060.pdf|Intel 8272A Datasheet (1986)]] - Licensed clone of the uPD765
* [[Media:FDC9229BT Datasheet.pdf]] - FDC9229BT data separator (that usually assists the uPD765 chip)* [[Media:SED9420.pdf]] - SED9420C data separator
* [[Media:DDI Schematic.png]] - DDI-1 Schematic (disc interface for CPC464)
* [[Media:Panasonic-3 inch Floppy Drive EME-150.pdf]] Panasonic EME-150M 3inch Floppy Drive Datasheet* [[Media:NEC_FD1035_Floppy.pdf]] - NEC FD1035 3.5inch Floppy Disk Drive Datasheet (1984)
== External links ==
