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Master/slave
configuration jumpers
Circuit board
Pin 1
Pin 20 removed for keying
Drive is master; no slave present
Drive is master; Seagate slave drive present
Drive is slave; Seagate master drive present
Reserved positions (do not use)
Note. Drive is shown with
circuit board up.
A C
B D
Figure 1. AT interface cable connector and master/slave
configuration jumpers
4 ST9235 Family Installation Guide, Rev. B