Epson Stylus Pro XL+ [255/573] Copying rom characters to ram memory

Epson Stylus 820 [255/573] Copying rom characters to ram memory
R-24 Select Characters
Copying ROM characters to RAM memory
ESC/P 2 ESC/P 9-Pin ESC/P
You must tell the printer where to find characters: either in the ROM memory (for
built-in characters) or in the RAM memory (for user-defined characters). Each
time you want to print a user-defined character, you must switch to RAM
memory.
You may plan on using many of the standard characters along with your user-
defined characters. If so, you can avoid having to switch between ROM and
RAM memory each time by copying the characters from the printer’s ROM
memory to its RAM memory. The ESC : command performs this function.
When you send the ESC : command, the printer copies all the characters from
locations 0 to 127 in the currently selected typeface to the same locations in RAM
memory. You can then store your user-defined characters and still print all the
other characters (except those you redefine) without having to switch back and
forth between RAM and ROM memory each time.
Keep the following in mind when copying ROM characters to RAM memory.
On some printers, you can specify which typeface to copy to RAM memory;
see ESC : in the Command Summary and Command Table sections.
You can only define 10.5-point characters. Even if you select a different point
size with the ESC X command, characters in RAM can only be printed as
10.5-point characters (or as 21-point characters if double-height is selected).
Sending the ESC : command erases any characters that are currently stored in
RAM. Always copy ROM characters to RAM before you define user-defined
characters. (You cannot copy ROM characters to RAM during multipoint
mode.)
The RAM memory can only store characters of one type at the same time. If
you define subscript user-defined characters when normal height characters
are stored in RAM memory, for example, the printer erases all previously
stored characters. Always set the desired character traits before copying
characters (both ROM and user-defined characters).
Characters copied from ROM to RAM with the ESC : command must have
the same traits as the user-defined characters you plan to define. If you define
user-defined characters with different traits, the printer erases all previous
characters in RAM memory.
Defining user-defined characters clears any characters previously at that
character code location.
To print characters in RAM, you must first copy characters with the ESC :
command or define characters with the ESC & command. The printer ignores
commands that would print characters that have not been defined; nothing
will be printed.

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