Substituting DSHD for DSDD disks (or DS2D if you prefer)

Eric Smith spacewar at
Tue Jan 26 23:07:50 CST 2016

On Tue, Jan 26, 2016 at 7:04 PM, Chuck Guzis <cclist at> 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.

More information about the cctalk mailing list