IBM RT User's Setup Manual page 374

7. After the lig h t comes on, w ait up to four m inutes while numbers
flash on and off on the two-digit display.
8. Is the red two-digit display blank (no numbers on it)?
Yes.
Go to the next step.
No.
Go to Step 37.
9. Adjust the brightness and c o n tra st controls on the display, if
the display h as these controls. If you need help operating the
display, see
Note:
If y o u r system is connected to an IBM 5085 Graphics
Processor, the keyboard belongs to the 5081 Display at power
on. If you have not switched the keyboard to your display
Alt Sw Keybd
using the and
G ra p h ic s S y s t e m O p e r a tio n .
CONTINUE TO THE NEXT PAGE
Section 9. C hecking O ut the Option Installation
I B M R T P C G u i d e to O p e ra tio n s.
keys, see the
5080/R T P C
A S 07A 058
9-7