Hi,
 For a manual, check on http://bama.sbc.edu/tektroni.htm 
 the Boat Anchor Manual Archive. it has both 465B and 465M and a lot of other stuff besides. There is however a limit on concurrent downloads, so be patient: its free. To view the manual you might need a Djvu viewer (I got DJvu solo, which works fine).

You probably have the 'invert' switch on. try toggling it.

Good luck,
Christian


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