HP 5961-0509 manual Memory Status Response, Free Space status response returns two values

Note

Note

Note

If you determine there is insufficient memory to hold the data to be downloaded, some action is required. One method to make more memory available is to send the Flush All Pages command. This causes the printer to clear (process) the current page data from memory without accepting any new data for processing (refer to the “Flush All Pages Command” described later in this section). Another, more comprehensive method to clear memory is to send the Printer Reset (ECE) command. This not only removes data (deletes all temporary entities and the font cache) but also restores the User Default Environment settings (refer to the Printer Reset command in Chapter 4, “Job Control Commands”).

To print characters from a scalable font, the printer converts the scalable character outlines into sized bitmaps. These bitmapped characters are created on a character-by-character basis as they are needed for printing and are stored in memory. As more pages are printed using more fonts, the bitmaps consume more memory.

The bitmap characters used on the first page of a job can remain in memory until the end of a job. These stored bitmap characters are referred to as the font cache.

When an HP LaserJet 4 printer (or later) reaches a memory low condition it automatically deletes all of the font cache. It is possible to delete the cache immediately using a Printer Reset command. A Printer Reset clears the font cache, clears temporary entities, and restores the user default environment.

Memory Status Response

A Free Space status response returns two values:

TOTAL=

LARGEST=

“TOTAL=” identifies the total available user memory (in bytes). This value includes the largest block available and all smaller blocks.

Data downloaded to the printer is stored in a block (continuous section of free memory). If the printer does not have a large enough block to store the data, then the data is discarded and a memory error results.

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