Apple Personal LaserWriter NTR Specifications download pdf (Page 35)

CHAPTER 2

PostScript Software

Interpreter Parameters 25

Device Parameters 2

Each PostScript interpreter supports a collection of input/output storage devices, such

as communication channels, disks, and cartridges. You may set device parameters using

the setdevparams operator, and you may read them using the currentdevparams

operator. Like system parameters, device parameters require a password, are global to

the PostScript environment, and have similar persistence characteristics, and some of

them can be stored in nonvolatile storage.

Device parameters are different from both system and user parameters in that device

parameters may be interdependent. This means that the legality of a given parameter

may depend on the value of another parameter.

Device parameters fall into sets that correspond to a particular communications device

(%Serial%, %LocalTalk%, and so on). Some device parameters correspond to a

software entity such as a language emulator.

Note

Even if two printers are using the same I/O storage device, the

parameters in the set may be different, because the hardware

support for that device is different. ◆

Communication Device Parameters 2

The Personal LaserWriter 320 printer has an 8-pin serial connector conﬁgured to use only

the LocalTalk protocol. It supports the %LocalTalk% channel.

Section 3.5.2 in the PostScript Language Reference Manual Supplement also provides further

information on the LocalTalk parameter set.

WaitTimeout integer 40 Indicates the value in seconds to

which the user parameter

WaitTimeout will be initialized at

the beginning of each job. It may be

set to 0 or any number larger than 0.

A value of 0 indicates an infinite

wait period.

NOTE All the terms in the ﬁrst column are one word. They may be split onto multiple lines

because of column width restrictions.

Table 2-7 System parameters in the Personal LaserWriter 320 printer (continued)

Key Type Default Details

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 65 66

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Apple Personal LaserWriter NTR Specifications Page 35