Epson LQ-1000 User Manual - Page 98

Keep in mind that user-defined characters are stored in RAM, were defined

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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 initialized with the ESCape "@" command, all of the user-defined characters are lost. Also, your computer sometimes sends an initialization (INIT) signal, which wipes out all user-defined characters. (Some computers do this each time BASIC is loaded.) 6-20

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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 defini-
tions 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, how-
ever, 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 initialized with the ESCape “@" command, all of the
user-defined characters are lost. Also, your computer sometimes
sends an initialization (INIT) signal, which wipes out all user-defined
characters. (Some computers do this each time BASIC is loaded.)
6-20