HP LaserJet 4L - Formatter System

Functional Overview
Formatter System
Formatter System
The Formatter PCA is responsible for the following:
. Receiving and processing ASCII data from the various printer
interfaces.
s Monitoring front panel input and relaying printer status
information (through the front panel and the hi-directional 1/0).
. Developing and coordinating data placement and timing with
the print engine.
● Storing font information.
● Communicating with the host computer.
....
~DC Controller !
~Host Computeri
.-
‘“-”$-”---”
-------- -. . . . . .
t
....-._.-.4L-L -----
--.-,7----- . . . ..- . . .
17+
Formatter PCA
Video
Interface
1/0 Controller
Ttming
Controller
ROM
I
J
d
I
CPU
On
Board RAM
Control Panel
Interface
?
____ I
,~.-.-.-...-.-.....-.-..........
Figure 5-6
Formatter Block Diagram
5-12