Yes, you want use the "1.2M" ("dual
mode") drive in 96tpi stepping, but
but with "DD" (MFM,300RPM,250Kdtr) read/write. SOME of the 1.2M drives
refuse to do that, and INSIST on switching to 48tpi when in the "low
density" mode.
. . . and, . . .
some "12.M" drives do their "360K" mode as 360RPM with 300Kdata
transfer
rate;
some do 300RPM with 250K dtr (the way "360k" drives write "DD")
So, there can be further complications with both computer and drive.