Lexmark 248X, 249X manual 123

Count	Count is the number of bytes of data being downloaded
	starting with the font ID byte. The count is a 2-byte value
	downloaded as the low byte followed by the high byte.
Font ID Byte	The font ID byte is a 1-byte number that identifies the
	font. The ID byte for the 249x is 35 (x23).
Start	When downloading character data, the start address is
	the absolute address of the start of the character data.
	When downloading lookup table data, the start address is
	the address of the new entry in the lookup table. The start
	address is a 2-byte hexadecimal value downloaded as the
	low byte followed by the high byte.
Data	When data is character data, it comes from the character
	design. When downloading lookup table data, data is as
	follows:
Bit	Bit Values	Functions
1, 2, and		The absolute address of the character's
3 (Attribute		image data.
Byte 1)
7	1	Indicates that this is a block graphic
		character (connects at 6 LPI).
6	0	Indicates a downloaded character.
	1	Indicates a resident character.
5-0	The number of
	character data dot
	columns stored in
	memory.
4 (Attribute
Byte 2)
7, 6	0,0 Shading character.	The type of block graphic character.
	0,1 Line drawing	The type of block graphic character.
	character.
	1,0 Underscore	The type of block graphic character.
	character.
	1,1 Not supported.	The type of block graphic character.
5-0	For a 10 cpi Letter	The number of dot columns of character
	Quality 36 column	data printed minus one.
	character, bits 5-0
	would be 35.

Section 7: Downloading Characters and Fonts 123