They are the equivalent to regular 8 mm tapes and give
 me 240 lines of resolution, not the 400 lines of high 8
 resolution. 
That's a kind of gotcha.  I notice 6 detents on the bottom of
the cassetts, including the readonly switch.  I wonder if the
difference seen on a Hi8 is what's needed here (IE drill out
the first detent).
John A.