IBM RT User's Setup Manual page 101

3-8 User Setup Guide
8. Is the red two-digit display blank (no numbers on it)?
Yes. Go to the next step.
No. Go to
I B M R T P C P r o b le m D e te rm in a tio n G u id e .
9. Adjust the brightness and c o n tra st controls on the display, if
the display has these controls. If you need help operating the
display, see
I B M R T P C G u i d e to O p e ra tio n s.
N o te: If your system is connected to a IBM 5085 Graphics
Processor, the keyboard belongs to the 5081 Display at power
on. If you have not switched the keyboard to your display
using the A lt and Sw K eybd keys, see
S y s te m O p e r a tio n .
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AS07A058
5 0 8 0 / R T P C G ra p h ic s