IBM RT User's Setup Manual page 54

Display (IBM 6153)
Connect this display to the 16-pin connector on the IBM RT PC
Advanced M onochrome Graphics Display Adapter. Connect the
power cable to the display power connector on the system unit. Do
not confuse the brightness control on the front of the display with
a power switch.
I BM 6153 A d v a n c e d M o n c h r o m e G r a p h i c s D i s p l a y C o n n e c t e d to
IBM 6150 S y s t e m Uni t
AS07A018
2-15
Section 2. Connecting Devices