IEI Integration ROCKY-3786 v4.0 - Manual (Page 50)

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23 GROUND 24 WRITE GATE#
25 GROUND 26 TRACK 0#
27 GROUND 28 WRITE PROTECT#
29 N/C 30 READ DATA#
31 GROUND 32 SIDE 1 SELECT#
33 N/C 34 DISK CHANGE#
Table 3-12: FDD Connector Pinouts
Figure 3-10: FDD Connector Location
3.2.10 IDE Interface Connectors
CN Label: CN1 (primary) and CN7 (secondary)
CN Type: 40-pin header (2x20)
CN Location: See Figure 3-11
CN Pinouts: See Table 3-13
Two IDE connectors provide connectivity for four IDE devices.