I-Data 5250 ALLY - Manual (Page 220)

AGILE 5250 ALLY User’s Guide and Reference Page B-38
Command: Load Alternate Characters (LAC)
Format: 2B FE nn mm ch i1 i2 i3 i4 i5 i6 i7 i8 i9 [i10]...
Printers: 4214, 5224, 5225
Action: Specifies new character bit images for selected
characters. The parameters ch and i1 through i9 (or i10)
must be specified in sets (10 or 11 bytes per set).
The mm parameter specifies the image type for all
character images defined with the command.
For the 4214, valid values for the mm parameter are 01h,
which specifies that the bit images are 8 bits tall by 9 bits
wide, and 02h, which specifies that the bit images are 8
bits tall by 10 bits wide.
For the 5224 and 5225, the only valid value is 01h.
The ch parameter specifies the character for which a new
bit image is to be defined. The ch parameter value may
range from 00h to FFh. Control characters that have bit
images defined for them in this way may be printed in
transparent mode. See Transparent (TRN 35h) for more
information.
Parameters i1 through i9 (or i10) are the bytes of image
data. The data is organized as vertical “slices” of eight
bits (one byte) each. For 8
x
9 mode (mm=01h), there are
9 bytes of slice data per character bit image. For 8
x
10
mode (mm=02h) there are 10 bytes of slice data per
character bit image.
The first byte of bit image data for a character is the
leftmost vertical slice of the character bit image; the last
byte of data is the rightmost vertical slice of data.
The most significant bit of each byte is the top bit of the
slice; the least significant bit of each byte is the bottom
bit of the slice.
Bits that are set ON are printed as black; bits that are set
OFF are not printed.