Technical data

$ DEFINE/SYSTEM/EXECUTIVE DCPS$queuename_DEVCTL_CACHE 1

Caching device control library modules can decrease the total CPU time

consumed by the symbiont by as much as 17 percent. I/O activity on the part

of the symbiont is also reduced by as much as 50 percent.

You can deﬁne the system logical DCPS$DEVCTL_CACHE (with no queue

name speciﬁed) to specify that device control library caching is enabled for all

DCPS print execution queues on that system.

7.12 Printing on Unrecognized Printers

The DCPS software automatically obtains a printer’s product name before

printing jobs. It uses the product name to select and download device control

modules that are speciﬁc to the particular printer.

If you use the DCPS software with a printer whose product name it does not

recognize, the product name defaults to ‘‘UNRECOGNIZED’’ and the supervisor

downloads device control modules associated with that name. Although this

conﬁguration is unsupported, the modules associated with the unrecognized

printer may be sufﬁcient to permit simple printing with that device.

A system manager can also modify the corresponding device control modules as

needed without affecting the characteristics of any of the supported printers.

By following the comments contained within the LPS$$UNRECOGNIZED

modules, along with some knowledge of PostScript and the speciﬁcs of the

printer, and examination of device control modules for similarly programmed

printers (if any), the system manager may be able to get tray and sheet size

selection working for the printer.

Note

Your use of an unrecognized printer with DCPS, and any use or

modiﬁcation of the LPS$$UNRECOGNIZED device control modules,

is without support or assistance from Compaq Computer Corporation.

Further, Compaq makes no commitment to maintain the same contents

of or interface to these modules for different versions of DCPS.

Device control modules are located in the following device control library:

SYS$COMMON:[SYSLIB]DCPS$DEVCTL.TLB

Creating Setup Modules and Device Control Libraries 7–15