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4635 LPS SOFTWARE COMPONENTS
Operating system executive task The OSEXEC task is always running. It interfaces with the LPS
hardware and logs hardware errors. In addition, it queues
devices, manages resources, establishes priority for software
tasks, and schedules processing.
File control program The FCP or FMS task manages disk resources. It manages and
allocates all disk space, creates all disk files, and accesses disk
files.
Operator communication
subsystem The OCS task acts as an interface between the operator and
software tasks by receiving input from and displaying messages
to the operator. OCS also interfaces between system tasks.
Diagnostic tasks The OSDS runs either under the OSEXEC task or from offline
sources. It controls the processing for the PROBLEM command.
Diagnostic support is also provided to your service technician by
the stand-alone field engineering software (SAFES) task.
System utilities The LPS has many utility programs which run under the OSEXEC
task that provide maintenance services such as: backing up the
system (DSR); tracking the unusable sectors on disks (FCHECK);
assigning a maximum size to the working print file
(REALLOCATE); eliminating wasted space on the disks
(COMPRESS); and making used space available again (PURGE).
Editor task The Editor task creates and modifies disk files. When you save a
work file, it stores the contents permanently on the disk. It
sends files to print; sends FSL and JSL files to be compiled;
directs CMD files to execute; and manipulates temporary (TMP),
miscellaneous (MSC), patch (PCH), and data (DAT) files.
Font Editor task The Font Editor task creates and modifies font files. The font
files are stored permanently on the disk when you save them.
Input task The input task reads in print job data, creates a job control block
file, and delivers job messages to the operator. Then the input
task unpacks and converts the data; selects and deletes blocks or
records; records any special processing instructions (for page
offsets, DJDE records, CMEs); and records the disk addresses of
the font, form, and image files used for the job. The result is a
page buffer, consisting of the variable data and print instructions
for the page, and the page log, consisting of tracking information
used to process the page.
Dynamic job descriptor task The DJD task compiles the Dynamic Job Descriptor Entries
(DJDEs) in the job stream. (The DJDEs give the printer
instructions for printing based on the result of true/false tests of
the data in the job stream.
Interpress decomposer task The IPD task translates input data sent in Interpress format into
ASCII raster format.
XEROX 4635 LASER PRINTING SYSTEM PRODUCT REFERENCE 4-3