HP 3150 EN - Manual (Page 75)

EN Formatter system 73
Random-access memory (RAM)
● One bank of RAM, which is battery-backed, stores parameters.
Another two banks of RAM are used for temporary storage.
● DRAM (Dynamic RAM) provides temporary storage of fax, copy,
scan, and print data.
Parallel interface
The formatter receives incoming data through its bidirectional ECP
interface. This interface provides high speed and two-way
communication between the printer and the host, allowing the user to
change printer settings and monitor printer status from the host
computer.
Control panel
● two front panel status lights
● control panel keyboard
● control panel display
Draft mode
Depending on the printer driver, selecting a “draft” or “economy”
mode from the printer driver allows the HP LaserJet 3100/3150
product to use approximately 50% less toner, extending the life of the
toner cartridge. This is only available using printer driver properties
when printing or making copies from the software.