IBM RT PC Options Installation page 53

8. Look at the diagram of the power cable. The 4-pin connectors connect
as follows:
• PI 0 is connected to the power supply.
• P 11 is connected to the first diskette drive, position A.
• P12 connects to the second diskette drive, position B.
• P13 connects to the first fixed-disk drive, position C.
• P14 connects to the second fixed-disk drive, position D.
• P 15 connects to the third fixed-disk drive, position E.
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Drive Position B
Drive Position D
Drive Position E
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Options Installation