25 Jul
2006
25 Jul
'06
12:28 a.m.
On 7/25/2006 at 3:09 AM Segin wrote:
I got a 8" disk myself, it's a Verbatim brand,
but I don't have a reader
for it.
The way I do these is to use a Catweasel and my own code to grab the raw
pulse intervals, then write a decoder for what I see. Unfortunately, while
this looks a lot like MFM, it doesn't really seem to be that. The
histogram of the pulse data doesn't look like GCR either. If you take the
shortest clock period as n, FM usually shows as two peaks spaced at n and
2n; MFM, as 3 peaks spaced n 1.5n and 2n, and GCR several (usually 5) peaks
spaced at n.
Cheers,
Chuck