3800 Image Library
Generating a VM/370 System that Supports
the 3800 Image Library
The generation of a 3800 image library that runs under the control of VM/370 is normally done after the VM/370 system generation is completed.
However, when a 3800 image library is to be generated, the following
preparations must be made: • An RDEVICE macro instruction for the 3800 printer must be included in
the real I/O configuration (DMKRIO) file. • The 3800 image libraries that are to be used by VM/370 must be stored
on a CP-owned volume in the page format that is currently used for
saved virtual machine systems (that is, those created by the SAVESYS command). All 3800 image libraries in the system name table (CP module DMKSNT) and saved with the IMAGELIB command. • Enough space to contain the 3800 image library must be allocated on
the CP-owned volume specified in the NAME3800 macro instruction.
Coding the RDEVICE Macro
The RDEVICE macro is described in Part 2. However, the format of the RDEVICE macro for a 3800 is included here to help you code the macro
correctly. The format of the RDEVICE macro for an IBM 3800 is:
r I Name Operation Operands
1--------------- I I RDEVICE ADDRESS= ccu, DEVTYPE=3800, [FEATURE=4WCGMS,] [IMAGE=imagelib,]
[ CHARS=ffff, ]
[FCB=lpi g ] , 1 , ! I [ DPM SIZE=n, ]
L
ADDRESS=cuu is the real device address (cuu) of the 3800. DEVTYPE=3800 is the device type. PEATURE=4WCGMS is a 3800 device with 4 Writeable Character Generation
Modules.
IMAGE=imagelib is the image library to be used by the 3800 printer
device after a cold start if none is specified on the
ST ART command.
CHARS=ffff
FCB=lpi
is the character arrangement table for the 3800 printer
device to be used after a cold start if none is specified
on the START command.
is the FCB to be used for the page separator for the 3800 printer device after a cold start if none is specified on
the START command. Part Planning for System Generation 69

3800 Image Library DPMSIZE=n is the maximum size of the delayed queue for the 3800 printer device.
Hardware Supported
As a VM/370 real spooling device, the following hardware features of the 3ROO are supported: • Automatic 10aa1ng of character
modifications
arrangement tables and graphic • Full support of the additional storage character generation feature • Forms overlay feature (flashing) • Copy modifications
The use of multiple character arrangement tables for printing use
within one spool file (TRC support) is D21 supported. Related Publications The Q! l1H1 lftOO PrintilliI manual, Order No.
GC20-1775 is intended as a first reader for those users of printers who
wish to take a quick look at the non-impact IBM 3800 Printing Subsystem,
at its basic concepts and at how these concepts lead to new functions
tha t may offer different options in planning and operations.
The i2!: lhe IBM 1800 Order No.
GA26-1635 provides information on the functions and features of the IBM 3800 Printing Subsystem relating to channel commands, sense bytes, and
error detection, recovery, and recording. Specific information and
examples are given of copy modification and control and graphic
character modification.
The 1.§00 Order No.
GC26-3846 provides planning and conversion information for the IBM 3800 printing Subsystem and information on how to use the 3800. Creating and Updating a 3800 Named System A named system must be established (via the NAME3800 macro) in DMKSNT for each system data set capable of image library activation. The
purpose of the named system is to contain the 3800 character arrangement
tables, copy modifications, graphic modifications, and FCBs. They can
then be referenced by name and the data for them obtained from this
named system when the file referencing them is about to print on a 3800. The active named system for a particular 3800 is in its RDEVBLOK and can
be changed by the START command. See the NAME3800 macro description in "Part 2. Defining Your VM/370 System_" Programs exist to enable you to dynamically change the character
arrangement tables, graphic modifications, copy modifications, and FCBs
available. With these programs (GENIMAGE and IMAGELIB), and the named
system support discussed above the installation can make these changes
dynamically, without a VM/370 system load. GENIMAGE and IMAGELIB are
described in detail in the 70 IBM VM/370 Planning and System Generation Guide