16 Sep
2009
16 Sep
'09
9:25 a.m.
On 16 Sep 2009 at 7:21, dwight elvey wrote:
I don't think one can just take the same timing
that was read
and write the bits back. Normally the controller adds some preemphasis
and deemphasis to make the timing right for the reads. For the M2FM,
this would require a little experimenting.
I do think the CW could do the job though.
What sample frequencies does it have?
The raw frequencies are selectable from 14,161, 28.322 and 56.644
MHz, but I believe that these are divided by 16 for the actual sample
rate. Almost all of my work involves reading, not writing (the
original equipment is usually long gone). The only time I can recall
having to use the CW for duplication was to duplicate some RX02
floppies with DECs interesting implementation of MFM.
I'd first recommend trying out Tim Mann's CW2DMK and DMK2CW utilities
on one of the MDS floppies? It might just work...
Cheers,
Chuck