The graphic character modification data following the header information is a series of 73-byte segments for the 3800 Model 1 and 126-byte segments for the 3800 Model 3. A maximum of 64 such segments is allowed in a module. The module structure is shown in Figure 1.

Figure 1. 3800 Graphic Character Modification Module Structure for One Character

When a graphic character is to be modified, the 3800 uses the translation table code to index into the translation table. The contents found at that location (a 1-byte WCGM code) determine the WCGM location into which the scan pattern and character data are to be placed.