Reading Disk Side 2?
They all use the same controller chip, which has the traces for the E2 jumper (sometimes labeled GX or EX). You just need to figure out which jumper it is. I believe it is the jumper at the very top of your picture (just to the left of the screw). You can do what most people do and that is pull a jumper, power off and back on, and then test it.

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