3.5" floppy jumpers

[Curtis H. Wilbar Jr.]

I have 3 3.5" floppy drives with configuration jumpers (and 5 times
as many without :-) ).

Ons is a Chinon FZ-357, and has jumpers for: MD, RDY, MM, DC, and
TTL/C-MOS.

Another is a TEAC FD-235HF and has jumpers for: H HO, OP, LHI, HHI,
and a position (but no header pins) for FG.

The last is a Sony MPF520-1 which has 2 rows of 3 pins... and I have
no idea what they are for.

I understand some abbreviations... RDY (ready), DC (disk change),
but not MD, MM, TTL/C-MOS (assuming this is for interface logic
levels?), and the TEAC ones I don't know at all.

The Sony one is a mystery, and a google search hasn't turned
anything up... don't know if the headers are for selecting D0-D3
only... or more than that.

Can someone fill me in/point me to web pages on these 'magic' jumpers
for these drives ?

Thanks,

-- Curt