Lexmark 249X, 248X manual 112, Printable

Attribute byte 2 specifies proportional-spacing information. Bits 6-0 specify spacing information. Set these bits to 0 if proportional spacing is not desired. When you use proportional spacing with a downloaded font that has bits 6-0 set to 0, all 11 bytes of character data print.

Bit	Bit Values	Functions
7	Set to 0.
6, 5, 4	Interpreted as a binary	Specifies the number of leading dot
	number.	columns to ignore. This number is the
		offset. Up to 7 dot columns can be ignored.
3, 2, 1, 0	Interpreted as a binary	Specifies the number of dot columns to be
	number.	printed. Each character is automatically
		followed by a blank column that is not
		included in the character width. Widths
		greater than 11 will be treated as 11.
Printable	Define the printable data.	These bytes are unique to each character,
Data		and must be specified for each download
(Bytes 3		character. The printer prints one byte at a
through		time. Each wire in the printhead has a
13)		corresponding bit in each byte, depending
		on whether the character is an ascender or a
		descender. To print the dot, set the bit to 1.
		See the following illustration.

Bit	Bit
7	Not Used
6	7
5	6
4	5
3	4
2	3
1	2
0	1
Not Used	0
Ascenders	Descenders

112 Section 7: Downloading Characters and Fonts