My manual says that you need to jumper the fourth pair of pins from the left on Jumper Block A.
That is, if you are looking at the card (RAM & chips side) with the edge connector at the bottom and the external SCSI connector to your right, Jumper Block A is the set of 11 pairs of jumpers in the middle of the card. Like this:
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Count four from the left and jumper the two pins (upper and lower).
Let us know if this works!
