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available number of bytes are shown on the status sum-
mary sheet. Each macro counts as one font.
NOTE:
The LaserJet Plus printer has 395K-bytes of mem-
ory available for downloading fonts and buffering page
images. It also limits the number fonts used per page to
sixteen.
B
Printer Control Language
The HP LaserJet printer command set is based on Hewlett-
Packard's Printer Control Language (PCL) , common to a
wide variety of printers manufactured by HP and others.
In LaserJet emulation mode, your QMS printer meets the
requirements of Level IV PCL (Page furmatting) printers,
which provide the highest performance available under the
language. The LaserJet command set is in fact a superset
of Level IV PCL, because of non-PCL features such as
portrait/landscape orientation, multiple copy control and
paper source control.
PCL includes commands of two types:
• Control characters, which are single-character com-
mands with ASCII values of 32 or less. Examples
include the Shift In (SI) and Shift Out (SO) com-
mands used to switch between primary and secondary
fonts, respectively.
1
• Escape sequences, which are multiple-character com-
mands beginning with an <ESC> character (ASCII
27).
Most LaserJet commands fall into this category.
A control character sent in the middle of an escape se-
quence causes the latter to be discarded, and the con-
trol character is executed. Similarly, an <ESC> character
causes a partial escape sequence to be discarded, and a
new sequence is started.
IThe space character (ASCII 32) is treated as a control character, so it
does not have to be included in each font's character set.
HP Emulation Mode
H-3
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