QMS 2425, Reference

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This type of memory contains data and/or machine-executable
instructions that can be read but not modified. This information is not
lost when the printer’s power is turned off.
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RAM is the memory your printer uses to perform each task. It can be
written to and read from. Once a task is complete, the memory is free
again to be used for another file. This memory is volatile, so if your
printer loses power while a file is being sent, you must resend the file.
The number and type of features you can run on your printer simulta-
neously depend on the amount of RAM you have and how that RAM
is distributed. Your printer comes with either 8 MB or 24 MB of RAM,
but it is upgradable to 128 MB by adding Single In-line Memory Mod-
ules (SIMMs).
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Also called a virtual disk, the RAM disk is an area of RAM that is used
to simulate an additional hard disk. Data can be written and read
more quickly than on a hard disk, but a RAM disk loses any informa-
tion stored on it when the printer's power is turned off. The spooling
buffer is a RAM disk client if a hard disk is not available.
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The printer’s SCSI port allows you to connect up to three optional
SCSI hard disks and the optional CrownCopy scanner, providing stor-
age for fonts, emulations, and other files. Hard disks are also used to
increase the amount of collation that can be accepted and provide a
secondary storage area for spooled data, while providing virtual
memory capabilities.
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This is an optional internal hard disk. “Integrated” refers to the fact
that all of the controller electronics are on the drive itself, so no sepa-
rate adapter card or expansion slot is required.