Oce 1010N - B/W Laser Printer Operation Manual page 162

Parallel Interface
Power Ready (Pin 35) Power Ready (Pin 35)
Power Ready (Pin 35) Power Ready (Pin 35)
This signal is high when the printer's power is on.
Select In [nSelectIn] (Pin 36) Select In [nSelectIn] (Pin 36) Select In [nSelectIn] (Pin 36) Select In [nSelectIn] (Pin 36)
This signal is used in some versions of the Centronics interface to enable
the computer to force the printer online.
C-5