Dell OptiPlex 170L - Manual (Page 65)

Floppy Drive Power Connector
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Pin Number Signal Name 18-AWG Wire
1 +12 VDC Yellow
2 COM Black
3 COM Black
4 +5 VDC Red
Pin Number Signal Name 22-AWG Wire
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 VDC Yellow