HP 2420 - Manual (Page 181)

Printer Memory
This option matches the setting to the amount of memory that is installed in the product. The driver
generates ranges of memory that can be selected, up to the maximum that the product can accept.
The driver can use this information to manage how the print driver uses the product memory.
When a minimum total memory of 80 MB is installed, the Job Storage option and the Mopier Mode
are enabled in the print driver. The Job Storage option allows you to store print jobs, and then print
them later from the control panel. The multiple-original print (mopy) function is an HP-designed
feature that produces multiple, collated copies from a single print job.
HP Traditional Postscript 3 Emulation Driver features 165
HP traditional drivers