Lexmark T640 Technical Reference page 211

quiet
— quiet integer
queries the PowerSave page device parameter. An integer is returned on the
stack:
0
Power Saver is Off
1 120 1 to 240
to or
Number of minutes elapsed after last page prints before
Power Saver is invoked.
Power Saver reduces power consumption when the printer is idle. When
is enabled, it takes longer to print the first page after the printer has been idle.
Note: Some printer models released in the year 2000 or later designated as Energy
Star printers cannot have Power Saver disabled.
This operator is equivalent to executing the following PostScript emulation
sequence:
currentpagedevice /PowerSave get
Error: stackoverflow
ramsize
— ramsize integer
queries the current setting of the RamSize system parameter. An integer is
returned on the stack showing total RAM in bytes.
This operator is equivalent to executing the following PostScript emulation
sequence:
currentsystemparams /RamSize get
Error: stackoverflow
4-33
(Model specific)
PostScript
quiet