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.

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HP 3150 manual Parallel interface, Control panel, Draft mode, Random-access memory RAM