Whats the 3 (Far Left) Jumpers used for on the LiteOn LTD-163D ?

I went and bought a LiteOn LTD 163D to replace my dying Toshiba CDROM XM6402B.

Though i noticed that at the back of the drive there are 3 Jumpers there (next to the digital audio connector).

The small manual that comes with the drive doesnt mention the use of them - so i am wondering what they are used for - does anyone know ?

Shadey
 
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