HP LaserJet 4v/mv Service Manual - Page 76

Printer Memory

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NOTE Printer Memory If the printer encounters difficulty managing available memory, a Clearable Warning message will be displayed on the Control Panel. Refer to "Clearable Warnings" in Chapter 7 for details. Read Only Memory (ROM) Besides storing microprocessor control programs, the ROM stores dot patterns of internal character sets (fonts). Random Access Memory (RAM) The RAM contains the page and I/O buffers and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily store a full page of print image data before the data is sent to the print engine (see "Page Protect"). RAM memory capacities for each printer are shown under "Printer Features" in Chapter 1. Memory capacities can be increased by adding SIMMs to the Formatter PCA. Note that adding memory (SIMMs) may also increase print speed when printing complex graphics. SIMM Slots The SIMM slots may be used to add memory, fonts, the PostScript Language SIMM, or firmware upgrades. The optional PostScript language SIMM can be installed in any of the SIMM slots on the Formatter PCA. It allows the printer to automatically receive and print files configured in the Adobe PostScript language . An additional 8-Mbytes of memory is recommended for PostScript printing. Non-Volatile Memory (NVRAM) The printer uses NVRAM to store I/O and print environment configuration information. The contents of NVRAM are retained when the printer power is turned off or disconnected. Disk Accessory The optional Disk Accessory is mounted on the rear of the Formatter PCA. It can be used to permanently store downloaded Adobe PostScript fonts and forms in the printer. The disk provides 42.8 Mbytes of storage area for these functions. 5-14 Functional Overview

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Printer Memory
NOTE
If the printer encounters difficulty managing available memory, a Clearable
Warning message will be displayed on the Control Panel. Refer to
“Clearable Warnings” in Chapter 7 for details.
Read Only Memory (ROM)
Besides storing microprocessor control programs, the ROM stores dot
patterns of internal character sets (fonts).
Random Access Memory (RAM)
The RAM contains the page and I/O buffers and the font storage area.
It
stores printing and font information received from the host system, and can
also serve to temporarily store a full page of print image data before the
data is sent to the print engine (see “Page Protect”). RAM memory
capacities for each printer are shown under “Printer Features” in Chapter 1.
Memory capacities can be increased by adding SIMMs to the Formatter
PCA.
Note that adding memory (SIMMs) may also increase print speed
when printing complex graphics.
SIMM Slots
The SIMM slots may be used to add memory, fonts, the PostScript
Language SIMM, or firmware upgrades.
The optional PostScript language SIMM can be installed in any of the
SIMM slots on the Formatter PCA.
It allows the printer to automatically
receive and print files configured in the Adobe PostScript language . An
additional 8-Mbytes of memory is recommended for PostScript printing.
Non-Volatile Memory (NVRAM)
The printer uses NVRAM to store I/O and print environment configuration
information.
The contents of NVRAM are retained when the printer power
is turned off or disconnected.
Disk Accessory
The optional Disk Accessory is mounted on the rear of the Formatter PCA.
It can be used to permanently store downloaded Adobe PostScript fonts and
forms in the printer.
The disk provides 42.8 Mbytes of storage area for
these functions.
5-14 Functional Overview