IBM RT User's Setup Manual page 197

2-22 Options Installation
11. Connect C-Cl on the cable bundle to the 20-pin connector on
the drive adapter.
12. Put the adapter in adapter slot 1. Replace the screw.
13. If this is th e last drive to be in stalled , replace the cooling fan
assembly. See "Cooling Fan R eplacem ent" on page 2-6.
14. If there are other options to be installed, do so now, and th en
check out the system using Section 9, "C hecking O ut the
Option In s ta lla tio n " on page 9-1.
Data Cable
20-Pin Connector
AJZIF056