Functional Overview
Formatter System
The Formatter PCA receives ASCII data from the Bi-Tronics
Interface and converts it into a dot image. The image orientation
(portrait or landscape) and the font type are both selected. When
the scan buffer is full, or when a Form Feed command is received,
the Formatter sends a PRINT signal to the DC Controller. The DC
Controller synchronizes the Image Formation System with the
Paper Feed System, and signals the Formatter to send the print
image data. The Formatter sends the print image data (dots) in
the form of a VIDEO signal and the printing process begins.
CPU
The Formatter PCA incorporates the following microprocessors:
● LaserJet 4L - Motorola 68000, 16 MHz.
● LaserJet 4ML - Intel 80960KA, 18.5 MHz.
. LaserJet 4P - Intel 80960SA, 16 MHz.
. LaserJet 4MP - Intel 80960KA, 18.5 MHz, 32K instruction cache.
Read Only Memory (ROM)
Besides storing microprocessor control programs, the ROM stores
the dot patterns of internal character sets (fonts).
Random Access Memory (RAM)
The RAM 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. Note that adding
memory will not increase 1/0 buffer space or print speed.
Note
The LaserJet 4P/4MP printers support 32-bit
SIMMS (C303XA series) as well as the 36-bit
SIMMS (C206XA series) used in earlier LaserJet
family printers.
5-13
To Next Page
Loading...