Virtual printer ASCII control code attributes

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The _ _CTL group of virtual printer attributes store ASCII control codes used by the printer.

These attributes begin with the letter a and store values such as the control code used to advance paper to the next page. The following control codes are typical for a supported PostScript printer:

_ _CTL CONTROL CODES (ASCII)
aF     PostScript Command to Set Simplex/Duplex and   %?%G_Y%ttrue
         Tumble Mode                                  duplex %?%G_Y%
                                                      {1}%=%tfalse t
                                                      umble%etrue tu
                                                      mble%;%efalse
                                                      duplex%;
af     ASCII Control Code to Advance the Paper to     showpage
         Top of Next Page (FF)
ar     Cannot access message catalog pioattr1.cat.    %G_6%d setreso
                                                      lution
at     Cannot access message catalog pioattr1.cat.    %G_u%d setpape
                                                      rtray

The colon file stores these attributes as follows:

:052:_ _CTL::
:512:aF::%?%G_Y%ttrue duplex %?%G_Y%{1}%=%tfalse tumble%etrue tumble
%;%efalse duplex%;
:113:af::showpage
:119:ar::%G_6%d setresolution
:115:at::%G_u%d setpapertray