Epson LQ-850 Manuel D’Utilisation

If you entered the example program above, you defined an arrow

and placed it in the RAM location for ASCII code 64 (replacing the

at sign). You can now print out a three line sample of your work.
The first and third lines (printed by lines 80 and 120 of the

program) print the normal at sign; the second line (line 100) prints

the arrow that you defined. Run the program to see the printout

below:

As you can see, both sets of characters (the original ROM

characters that the printer normally uses and the user-defined

character set) remain in the printer available for your use. The

command to switch between the two sets is used in lines 90 and 110.

It is:

ESC   

If   is equal to 0, the normal ROM character set is selected (this

is the default), If   is equal to 1, the user-defined character set is

selected. If you select the user-defined character set before you have

defined any characters, the command is ignored; the ROM

characters will still be in use.

You may switch between character sets at any time - even in the

middle of a line. To try it, place semicolons at the end of lines 80
and 100 in the program above.

After running the program above, if you select the user-defined

character set and try to print other characters, the only one that will
print is the arrow. Since no other characters are in the printer’s

user-defined RAM area, nothing else prints. Other characters sent to
the printer don’t even print as spaces; it’s as if they were not sent at

all.

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