The marks drawn for mark numbers 8001 to 8128 are treated as the characters for character codes 80h to FFh. For example, 8001 corresponds to 80h, and 8002 to 81h.
If you create marks for these mark numbers, they will be registered as external characters.
By entering the input code that corresponds to a mark number on the base screen, the character on the display unit's base screen shows the registered external character.