MFM encoding/decoding is usually done with the blitter - one pass for decode, three passes for encode. It also provides a number of convenient features, such as sync-on-word (in MFM coding, $4489 is usually used as the sync word). MFM or GCR were the two most commonly used formats though in theory any run-length limited code could be used.
It can read and write raw bit sequences directly from and to the disk via DMA or programmed I/O at 500 (double density) or 250 kbit/s (single density or GCR). The Amiga floppy controller is unusually flexible since it is implemented in the custom chips of the Amiga itself. Transferring files between amiga and PC is another topic, and there using PC formatted 720KB floppies with CrossDOS is one option, albeit not necessarily the best one.Copy Protection Used on Commodore Amiga Computers Background If you wish to format any floppies for amiga use, just format them on amiga. Unless if you go for specialized hardware you cannot write or format floppies to amiga format on a PC. Thus you can use amiga to format disks to PC format (720KB or 1.44MB if you have a HD drive), but not the other way around. The PC floppy controller is much more rigid and doesn't allow as flexible track layout as amiga (technical: Amiga can write full tracks with whatever track layout desired, PC controller cannot). It's perfectly possible to use the higher density floppies in place of the lower density ones.
There are however double density (up to 1MB unformatted size) and high density (up to 2MB unformatted size) floppies (some higher density ones do exist as well, but are rather rare). The disks are exactly the same physically. I think there is a lot of confusion in this thread, and not alone from sim085.įirst of all, there are no "PC" or "amiga" floppies.
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