QMS 2425, Reference

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Inefficiently coded PostScript jobs can consume an extremely large
amount of virtual memory or leave objects in the PostScript Heap
after the print jobs are completed, leading to virtual memory errors. If
not enough memory is allocated to the PS Heap, the job cannot print.
Increasing the memory allocated to this client allows more complex
jobs to print and increases the number of fonts that can be down-
loaded to virtual memory.
However, this client should be increased only if you receive a virtual
memory error when attempting to print a job or download a font, and
even then it should be increased only in small increments until the
error message goes away. Excess memory in the PS Heap is not
used.
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Also known as K Mem Emulation, this client is used to store any
optional or loadable emulations, such as LN03 Plus or QUIC II.
Increasing this client’s memory allows you to load more than one
optional emulation so that it doesn’t have to be reloaded every time
the print job is sent.
If an emulation is loaded to process a print job and there is not
enough memory in the emulation client, another emulation already
loaded may be unloaded automatically to obtain enough memory. If
you notice a delay in printing between jobs that have different nonres-
ident emulations, it’s possible that the emulations are having to reload
each time they’re run. Adding to the emulation client may eliminate
the unloading and reloading of these emulations and, consequently,
increase throughput. QMS recommends that you should add at least
1 MB of physical RAM to your printer and increase this memory client
by 1 MB for each additional emulation loaded. If your printer has an
optional hard disk and the disk swapping option is turned on then you
can increase the emulation memory client using this memory.
» Note: You should add at least 1 MB to the emulation memory client
for each loadable emulation that your printer uses. Failure to add
memory to this client may prevent the printer from loading and using
the emulation. You should check the documentation accompanying
your loadable emulation for information on additional resource
requirements.