User-Defined Characters
Mixing print styles
Each of the three user-defined character modes (draft, Letter Quality, and proportional) can be used in combination with most of the LQ’s various print styles. For instance, emphasized works with user-defined characters. The characters you design are enhanced to give this printing effect.
Mixing the three types of user-defined characters is not permitted. If, for example, you select draft and define some characters, then select proportional and define some more, the first character definitions will be destroyed. Only one type of character definition may be stored in RAM at any time.
If you define characters in one mode, then switch to another mode and select the user-defined character set, the command will be ignored and nothing will print. The user-defined character definitions, however, remain unaffected. If you switch back to the mode in which they were defined, you can then select and print them.
Keep in mind that user-defined characters are stored in RAM, which is not permanent. Whenever the printer power is turned off, or the printer is intialized with the (INIT) signal, the user-defined characters are lost. (Some computers do this each time BASIC is loaded.) ESC @ does not destroy user-defined characters.