Datamax Prodigy Operator's Manual page 64

To print an image, select font type "Y". The horizontal and vertical
magnifications work with human readable fonts. The data sent into the
field is also used as the name of the defined graphic image.
GRAPHICS INPUT TYPE I
.IMG 8-bit format. Same as 7-bit ASCII preceded by header record 00
01 00 08 00 01 00 00 00 00 00 XX XX where XX XX = high byte, low
byte count of dot lines in image.
GRAPHICS INPUT TYPE P
.PCX 8-bit format
GRAPHICS INPUT TYPE F
7-bit ASCII
80nn
80
nn
0000FFnn
0000FF =
nn
FFFF
FFFF =
To print an image, specify font "Y". The horizontal and vertical
magnifications will work as if it were a human readable font. The data
sent into the field is used as the name of the defined graphics image.
Once images are in memory, they can be removed with the "R"
SYSTEM COMMAND. The image is named after the STX and the "R"
command will be cleared. Images are stored dynamically, meaning that
removing any images stored in the middle of a directory will shift
forward any images found in the outer area of the directory.
The following example creates and prints the image DATAMAX using
the type "F" graphics formatting method. The character "^B" denotes
the ASCII STX character. This example was created as a text file on an
IBM compatible PC with the DOS EDIT line editor program, and sent to
the Printer with the COPY command.
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= Generate following data
= # of bytes for data
Generate following data line n times
= # of lines to generate
Terminate input of graphics
Using the Printer