HP 5961-0509 manual Character Definitions, 11-48Soft Font Creation

Character Definitions

	Following the font header, the individual characters must be defined.
	Every PCL character definition contains a character descriptor and a
	body of character data. The character definition always consists of
	one or more character data blocks. Each character data block begins
	with its own header. The character data block header always has a
	size of 2 bytes.
	The first data block of a character definition must always have a
	character descriptor immediately after its 2-byte header.
	Character descriptor/data is downloaded using the Character
	Definition command preceding every character (see Character
	Definition Command).
Notes	A unique character code, using the Character Code command, must
	be designated prior to the download of a character descriptor and
	data. If the font being downloaded already contains a character with
	this code, the existing character is deleted during the download of the
	character descriptor and data.
	Unless otherwise specified, inappropriate values in a character
	descriptor field invalidates the character download process; a
	character is not created, and the associated descriptor and data
	are discarded.
	An undefined printable character is one which is in the printable
	range of the font type but has no defined pattern. Attempts to print
	an undefined printable character from a font result in the execution
	of a Space control code.
	Character descriptor fields identified as “reserved” should be set to
	zero.
	If the total byte count of the character descriptor and data exceeds
	32767 bytes, then the remaining data must be sent using the
	continuation descriptor.

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