3. Software components
This chapter is an overview of the Xerox 4050/4090/4650 Laser
Printing Systems (LPS) Operating System Software (OSS), resident
languages, interfaces, and the operating system.
Refer to the Xerox 4450 Mid-Range Printer Product Reference for
information on the 4450 MRP software components.
Operating System Software
The LPS OSS includes the components outlined in table 3-1.
Table 3-1. LPS OSS components
Component What it does . . .
Executive Schedules all LPS processing.
Operator and subsystem
(OCS)
Interfaces between the OSS and the keyboard/display or user interface.
Input processor Decodes and formats input data (offline magnetic tape, Ethernet, DEC
interfaces, etc.), then writes it to the system disk for subsequent printing.
Output processor Merges form and graphic data with input source data, producing merged
data in a coded format for printing. The output is sent to the printer, one
page at a time, through the image generator.
Interpress decomposer (IPD)
(4050F)
Used when an Interpress job is run. Decomposes simple Interpress masters
and sends them to input for processing. Decomposes the Publication Set of
Interpress and provides limited Professional Set support.
Print Description Language
processor (PDL)
Allows you to enter statements that specify the printing environment,
including input and output formats and processing requirements.
Forms Description Language
processor (FDL)
Allows you to describe forms using simple, English language commands.
Text editor Allows you to edit and manipulate source files.
Font editor Allows you to create new or modify existing font files.
File management subsystem Maintains system disk files.
Host Interface Processor
(HIP)
Receives data from a remote host, a DEC host, or local area Ethernet
networks. In the 4050F and 4135, HIP supports IBM SNA/SDLC or BSC (HIP
HOST=871), Ethernet (HIP HOST=XNS), DEC (HIP HOST=DMR), and
Xerox Printer Access Facility (HIP HOST =XPF).
Diagnostic software Operating System Diagnostic Software (OSDS) and Standalone Field
Engineering Software (SAFES) are used to identify and diagnose hardware
failures.
Utilities Several utilities provide a disk save/restore capacity, accounting summaries,
and file directory lists. They also include routines to compress files and
directories, restrict command use, etc.
XEROX 4050/4090/4450/4650 LPS PRODUCT REFERENCE 3-1
