Functional Overview
Formatter System
Non-Volatile Memory (
~)
LaserJet 4L: The HP LaserJet 4L printer does not use NVRAM.
As long as the printer is connected to an ac power source,
configuration and page count information (as well as any
downloaded fonts and macros) is retained in conventional RAM.
When power is disconnected, RAM contents are lost, page count
returns to zero, and the printer returns to factory default settings.
LaserJet 4ML/4P/4MP: 256 bytes of NVRAM is used on these
printers to store 1/0 and print environment configuration
information. The contents of NVRAM are retained when the
printer’s power is turned off or disconnected. (As in other HP
LaserJet printers, downloaded fonts and macros are saved in
conventional RAM, and are lost when power is turned off.)
Parallel Interface
The Formatter PCA receives incoming ASCII data through its
Bi-Tronics interface connector. The Bi-Tronics 1/0 provides high
speed two-way communication between the printer and the host,
allowing the user to change printer settings and monitor printer
status from the host computer. The Bi-Tronics I/O is compatible
with the Centronics parallel interface standard.
Note
— Refer to “Parallel Cable Pin Configuration” in
Appendix B for parallel pin assignments.
High Speed (Yes/No)
The “High Speed (Yes/No)” configuration item is user-selectable.
The default setting, “Yes” allows the I/O to run at the higher
speeds supported by most newer PCs. If the mode is set to “No,”
the parallel interface runs at the slower, but compatible mode for
older PCs.
Advanced Functions
(On/Off)
The “Advanced Functions (On/OffY configuration item is also
user-selectable. The default setting, “On” allows for “Bi-tronics”
two-way parallel communications. The “Ofi” mode disables the
Bi-tronics advanced functionality.
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