Figure 3-2: Fdd Connector Location; Table 3-1: Fdd Connector Pinouts - IBM 3301690 User Manual

21 GND
23 GND
25 GND
27 GND
29 GND
31 GND
33 GND

Table 3-1: FDD Connector Pinouts

Figure 3-2: FDD Connector Location

3301690 CPU Card
22 WRITE DATA#
24 WRITE GATE#
26 TRACK 0#
28 WRITE PROTECT#
30 READ DATA#
32 SIDE 1 SELECT#
34 DISK CHANGE#
33