IBM RT PC Options Installation page 69

TNL SN20-9864 (May 1987) to 75X0217
2-30 Options Installation
2. Check the drive selection jumper or switch for the correct setting,
and take the following actions with the terminating resistor:
• If the third fixed-disk drive is a Type R40 or R 70, ensure that the
terminating resistor is in place.
• If the third fixed-disk drive is a Type E70, remove the
terminating resistor by pulling the paper tab, if present, or by
inserting a small, flat-bladed screwdriver under one end of the
resistor. Carefully
pry
up, alternating ends to lift evenly.
Warning: Failure to remove the terminating resistor from the third E70
fixed-disk drive may result in adapter module damage.
Type R40
Drive
Selection
Jumper
Type R70 or E70
Setup Switches