Appendix B IBM ProPrinter X24 and IBM ProPrinter II Commands
B.2.8 Downloading Customized Characters (DLL)
If you like, you can create "your own" set of characters, and use it in place of the printer's character set. You can redesign all 256 characters, or just some of them, and load them into the printer's memory (DLL = Down Line Loading) using the command ESC = ...
Each time you can only load characters in ascending code order. If you want to load characters with
The area occupied by the characters is 9 dots high and 12 wide (the 12th dot is always a space). The matrix for constructing the characters has 11 columns with 8 dots per column. Eleven bytes (one per column) define the shape of the character. One dot is printed for each bit set to "1" (as in BIM graphics).
Using the DLL command, you can also create graphic symbols and shaded characters. The graphic symbols are automatically expanded from 8 to 12 dots high (by means of the character attribute) during printing. But be careful: the algorithm for creating the NLQ font style and the bold face may not work properly in these cases.
The table of the new characters will be loaded in the printer's RAM. Remember that the content of the RAM is cleared when you switch off the printer, so the DLL characters are also lost. If you want to reuse your DLL characters, you must reload them whenever you power on.
The DLL characters, to be printed, must be preselected using the command ESC I n .
Consult the following command:
ESC = : Customized characters (DLL)
ESC = n1 n2 ID m 
Customized Characters | Hexadecimal code: 1B 3D n1 n2.. |
character defining parameters: (a b NUL p1..p11)k
Enables customized characters to be created and loads them into the printer's RAM.
Parameters n1 and n2 indicate the number of characters to be created and loaded with the current code sequence.
The ID is a fixed value code which must be: (20)D for a Draft Font and (21)D for a ROMAN Font. (For further information about NLQ DLL characters, see the relevant section of this chapter).
Parameter m indicates the decimal code of the first of the standard characters to be replaced with customized characters. The customized characters that follow the first are automatically assigned the following decimal codes.
