Apple LaserWriter Pro 630 Envelope Feeder Specifications download pdf (Page 60)

CHAPTER 3

LaserWriter Pro Software

48 Resource Categories

Engine Device 3

The %Engine% device contains parameters that control the print engine itself. The

LaserWriter Pro’s %Engine% device contains the parameters listed in Table 3-18.

Resource Categories 3

In Level 2, PostScript objects, such as fonts, patterns, and ﬁlters can be managed as

open-ended collections of resources grouped into categories. A resource is requested by

resource category and name. If the resource does not reside in virtual memory, the

resource management mechanism loads it from an external source, such as a disk, a

ROM cartridge, or a network ﬁle server. The PostScript Language Reference Manual

discusses named resources in detail.

Tables 3-19 through 3-21 list the factory-installed categories and resource instances.

There are several groups of resources:

■ New resources that are part of the regular resource may be added by the customer.

These include such items as font and pattern resources (Table 3-19).

■ Categories of implicit resources (Table 3-20) represent built-in capabilities of the

interpreter. For example, the FontType category indicates that the interpreter

understands the font formats for font types 0, 1, 3, 4, 5, and 42.

■ Some resources deﬁne new resource categories (Table 3-21).

Table 3-18 %Engine% communication parameter sets

Key Type Default Details

Darkness real 0.5 Darkness controls the amount of toner applied to the

paper. A value of 0.0 signiﬁes the minimum darkness, and

1.0 signﬁes the maximum darkness. Values outside this

range are not legal. The LaserWriter Pro printer supports

16 levels of darkness, so this parameter is quantized into

16 steps. This is done by taking the integer portion of

Darkness*15. Therefore, a value of 0.0 is not

distinguishable from 0.05, but it is distinguishable from

0.1. Changes in the Darkness parameter are not sent to

the engine until there are no pages in the paper path,

either feeding or being copied.

Type name Parameters —

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 96 97

No comments

Apple LaserWriter Pro 630 Envelope Feeder Specifications Page 60