Drive select. Drive 1, 2, 3, or 4. Generally on the RQDX3 you have them set 
for drives 3 and 4 (as the floppies get 1 and 2)
--Chuck

At 02:31 PM 6/10/01 -0400, linc wrote:
>OK, I have an rd51 and an rd53..  Both have a 4 position jumper on the
>back..  What are the different jumper positions for?
>
>-Linc
>
>behemoth.linc.com NetBSD 1.5 pmax mipsel