HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 57)

56 2 Using the Printer Control Panel EN
Managing Memory
The printer supports an optional printer hard disk as well as ROM
(read-only memory) and synchronous DRAM (dynamic
random-access memory) DIMMs (dual inline memory modules).
DRAM DIMMs must be installed in synchronized pairs (two DIMMs)
with the same amount of memory installed in slots such as 1 and 2
(see task
5 on page 209 ). For more information on DIMMs, see
appendix A , “ DIMM Installation .”
The printer comes with a minimum of 32 MB of RAM and can be
expanded with additional DIMMs. The printer has four available DIMM
slots for additional 8, 16, 32, or 64 MB DIMMs.
An optional printer hard disk is available for storing downloaded fonts
and forms in the printer. Unlike standard printer memory, information
stored on the printer hard disk is permanently downloaded and can
remain in the printer even when the printer is turned off. A printer hard
disk also enables proof and hold and mopying features (which can
significantly decrease the processing time for multiple copies, or large
or complex jobs). For information on ordering a printer hard disk, see
“
Accessories, Options, and Related Products ” in chapter 8 .
Note A printer hard disk is required to mopy or proof and hold.