IBM OS/390 User Manual

can write your own using JES2 exit 1. (For PSF controlled printers, use PSF exits
APSUX01 and APSUX02.)

For separators between individual data sets or data set copies, you must specify
SEPDS=YES on the PRT(nnnn) statement and provide a JES2 Exit 15 for JES2
controlled printers. (For PSF controlled printers, use PSF exit APSUX03.)

POWER, by storing a carriage control tape image, allows a program to 

″

sense

″

channel 12 or end-of-page. This is not supported in JES2. Line count logic must
be substituted. You can change the application to count lines under VSE prior to
the MVS conversion.

POWER permits the 

″

channel one

″ 

position to be on any line of the page. JES2

requires Channel 1 to be on Line 1 for all printers controlled by JES2.

This restriction is in place because JES2 uses a skip-to-channel-1 to reposition
the printer to the top of forms when it goes through device setup.

Also see 10.3.4.8, “FCB Naming Differences” on page 217.

Incompatibilities such as JCL and Operator Commands are covered in other
chapters:

•

Chapter 4, “Job Control Language (JCL) Differences and Considerations” on
page 69

•

Chapter 28, “Orientation to OS/390 Console Operation” on page 443

This section describes the significant migration and conversion activities to
implement JES2 for the first-time user.

Both POWER and JES2 require DASD files to spool the jobs and their output, and
queues to manage them. The following figure describes the various types of
spool and control files of VSE/POWER and their equivalent file types in JES2.

Chapter 10. POWER and JES2