Re: Hardware musings

[Andy McFadden <fadden@fadden.com>]

Charlie <charlieDOTd@vereyezon.net> wrote:
>> I wonder why that is... maybe the index hole, the pc drive relies on the 
>> index to pass?
> 
> Yes at least it needs the index pulse with Disk2FDI although I don't know if 
> it is really used to do anything other than get the process started. 
> Disk2FDI uses some pretty interesting tricks to get an MFM drive to read GCR 
> disks.

The signal from the index hole is one of the streams recorded in the .FDI.

I haven't looked at the code in a while, but I believe it's used to find
the start and length of the track.

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