Which jumper to use for cable select (NEC ND-3550A)

[qanda]This question is published in the hardware section for the NEC ND-3550A. Click here to view full specs.[/qanda]nec 3550a needs to have jumper for cable select to use my other dvd rom. which one is it?

Look at the back of the 3550A.
There are six pins.
: : :
Should be marked MA, SL, CS.