On 01/26/2016 09:07 PM, Eric Smith wrote:
On Tue, Jan 26, 2016 at 7:04 PM, Chuck Guzis <ccl...@sydex.com>
wrote:
You've lost me there. Both HP and Intel were true MMFM;
There's more to it than the basic channel code.
IBM 3740 and Ohio Scientific 8-inch both use "true FM" for the
channel code, but they aren't compatible.
The HP 9895 M2FM and Intel M2FM may be the same channel code, but
the address marks are different, etc.
That's exactly what I was asking. But you implied that the RX02 was
MMFM, which, in my experience is not the case.
MFM is a (1,3) RLL code; MMFM is a (1,4) code. AFAIK, RX02 is a
combination of (0,1) for headers and (1,3) for data. WHat the decoded
clock and data bits actually mean is a separate issue.
--Chuck
