Tektronix Phaser 600 - Manual (Page 546)

S E T T I N G D E F A U L T H P - G L P E N C O L O R S
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Setting default HP-GL pen colors
Use the HPGLPENS.PS file to change the color and width of the default pen colors.
The HP 7475A plotter actually has only six pens, but the printer's emulation
supports up to 256 pens.
HP-GL pen settings cannot be made persistent across printer power cycles; pen
settings revert to the default when the printer is turned off. To restore your pen
settings, you must download your edited
HPGLPENS.PS file to the printer whenever
the printer has been turned off or reset.
The pen color change is persistent across jobs but not across printer power cycles;
it affects all HP-GL jobs that immediately follow it until the next printer reset.
N O T E
The HPGLPENS.PS file affects printer operation. If the printer is shared on a network,
using this file may affect the prints requested from other users.