Lexmark 249X, 248X manual 144, Downloading the Font Descriptor Byte

Downloading the Font Descriptor Byte

Send the following descriptor byte information to the printer:

<x

1B3D - download command prefix - font descriptor byte 0400 - byte count (low byte first) - x0004, 4

23 - font ID for 249x printers

189- font descriptor byte address (low byte first) - x8911

05 - font descriptor byte - ELQ

>

For more information about the Font Descriptor Byte, see page 121.

Creating the Lookup Table Data

Before creating lookup table data, make note of the following memory addresses.

•The valid download address range for the 249x is x800C to xFFFF.

•The ASCII character 0 lookup table entry addresses for the resident fonts are:

—Draft (10 and 12 cpi) and Fast Draft (10 cpi) - x8001

—10 cpi Letter Quality and ELQ - x8912

—Proportional Letter Quality and ELQ - x9213

—12 cpi Letter Quality and ELQ - x9B14

•Download character data can start at any address greater than xA413

In this example, the Letter Quality capital AE character (ASCII character 146) is replaced with the ELQ capital AE character. Entry zero of the draft table starts at x8011 and there are nine bytes per entry:

9 x 146 = 1314 = x522 (the offset into the table)

x522 + x8912 = x8E34 (offset + character ASCII 146 lookup table address)

The address for the new lookup table entry for ASCII character 146 is x8E34.

144 Section 7: Downloading Characters and Fonts