Apple LaserWriter Pro 630 Envelope Feeder Specifications Page 46

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CHAPTER 2
LaserWriter 16/600 PS Software
36 Interpreter Parameters
Interpreter Parameters 2
Certain parameters control the operation and behavior of the PostScript interpreter.
Many of them are connected with memory allocation and other specific-purpose
resources. For instance, interpreter parameters control the maximum amount of memory
allocated to virtual memory, font cache, and halftone screens.
The LaserWriter 16/600 PS printer is configured initially with interpreter parameter
values appropriate for most applications. However, using a PostScript language
program, you can alter the interpreter parameters to favor certain applications, or
to adapt the printer to special requirements. There are three classes of interpreter
parameters: user, system, and device. There are several types of device parameters,
including communications, parallel port, engine, and emulator parameters.
Each class has a PostScript language operator to read the parameter values
and an operator to set parameter values. There are six resulting operators:
currentuserparams, setuserparams, currentsystemparams,
setsystemparams, currentdevparams, and setdevparams.
You will find information on parameter semantics in the PostScript Language Reference
Manual, second edition.
User Parameters 2
Within reasonable limits, you can change user parameters without special authorization
or password, using any PostScript Language program. User parameters establish
temporary policies on issues such as size limits and inserting new items into caches.
The setuserparams operator sets user parameters, and the currentuserparams
operator reads their current values. Unless otherwise indicated, all user parameters
are subject to save and restore boundaries. The restore operator resets all user
parameters to their values at the time of the matching save. The initial value of the user
parameters when the printer is turned on for the first time depends on the product.
Table 2-9 lists the user parameters present in the LaserWriter 16/600 PS printer. You can
find further information on these parameters in the PostScript Language Reference Manual,
second edition, and the PostScript Language Reference Manual Supplement.
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