Epson Y465ss127mo - Manual (Page 137)

Since these characters are smaller, when you define them you need only
two bytes of data for each vertical row of dots. Design grids for these
characters are shown in the following figure.
Draft pica
Letter Quality
and Proportional
Mixing print styles
Each of the three user-defined character modes (draft, Letter Quality, and
proportional) can be used in combination with most of your printer’s
various print styles. For instance, you can use emphasized with your
user-defined characters.
Mixing the three types of user-defined character sets is not permitted. If,
for example, you select draft mode and define some characters, then
select proportional and define some more, the first character definitions
are 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 is ignored and nothing
is printed. 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.
4-32 Using Software and Graphics