IBM RT PC Options Installation page 62

8. Look at the diagram of the power cable. The 4-pin connectors
connect as follows:
•
•
•
•
•
•
Drive Position C
Drive Position D
PI0 is connected to the power supply.
Pll is connected to the first diskette drive, position A.
P 12 connects to the second diskette drive, position B.
P 13 is connected 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.
Drive Position B
Drive Position E
Section 2. Removing and Installing Drives in IBM
6150 2-25