Toshiba B-EP Series Interface Specification page 542

[Program example]
fprintf( stdprn, "\033! ");
fputc( 0, stdprn );
fprintf( stdprn, "11111\n");
fprintf( stdprn, "\033 %c", 0 × 20 );
fprintf( stdprn, "22222\n");
[Print example]
11111
2 2 2 2 2
Reference Underlining Set Command ([ESC] -)
Bold Printing Set Command ([ESC] E)
Character Size Set Command ([GS] !)
CHAPTER 8 ESC/POS MODE (INTERFACE COMMANDS)
/* Normal width */
/* Double width */
8-15
B-EP Series