2.5. Kernel extension for DNP printer matching - Mac OS 10.4 Tiger only.
A codeless kernel extension is provided for Mac OS 10.4. The purpose of the extension is to
redirect all the communication to a custom DNP printer class plugin when a DNP printer is
plugged in (see section 2.6). This is necessary because Mac OS 10.4 printing system does
not provide a channel for getting a printer response after sending a command.
Installing a kernel extension requires a system reboot to take effect. This is ensured by the
Installer package (see 2.7 below).
If the kernel extension is not installed properly or does not function properly, no printing
can take place. Because DS40 and DS80 are matched as different printer models, the proper
functioning of the extension should be ensured by making test prints on both models.
2.6. DNP printer class plugin - Mac OS 10.4 Tiger only.
The DNP printer class plugin overwrites the default USB printer class plugin provided by
the system. It acceps printer commands or printer data as an input and returns the printer
response to the calling client. The client is either the CUPS filter (see 2.2. above) or the the
remaining print count tool (see 2.4. above).
If the DNP printer class plugin is not installed properly or does not function properly, no
printing can tae place.
2.7. Installer package.
The installer package is a special Mac OS X bundle processed by Apple's Installer
application. The installer provides:
- Preflight of the host operating system version. The Installer should report an error and
perform no action if the host operating system version is not supported. This includes
versions prior to Mac OS 10.4 Tiger (estimated less than 0.5% of the installed base) and
future versions (post 10.6 OS releases).
- Present the End User License agreement to the user and request acceptance by the user. If
the user does not accept the conditions of the End User License agreement the Installer
should perform no action and quit.
- Present a Read Me file to the user. To encourage the user to read the file, a short version of
the Read Me is presented by the installer. The full version is provided on the install disk.
- Install all the required components (2.1 - 2.6 and 2.8) at their target locations.
- Prompt the user to restart the computer (Mac OS 10.4 Tiger only).
2.8. Additional resources.
These includes all resources required by 2.1 - 2.7 above:
- The printer icon file.
- The Read Me file.
- The End User License agreement file.
- ICC profiles for the DS40 and DS80 printers
- XML file used by the CUPS filter and the remaining print count tool for determining the
remaining print count, media codes and print size validation.
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