Epson SQ-2550 User Manual page 268

The following values can be used for n:
0: Roman
1: Sans Serif
2: Courier
3: Prestige
4: Script
5: OCR-B
6: OCR-A
7: Orator
8: Orator-S
Overrides the SelecType FONT and control panel settings.
ESC !
Format:
ASCII code:
Decimal:
H e x a d e c i m a l : 1 B 2 1 n
Comments:
Selects any valid combination of the following modes: 10 cpi,
12 cpi, proportional, condensed, emphasized, double-strike,
double-width, italic, and underline. For details on how to set
n, see the section on selecting typestyles with Master Select in
Chapter 4.
9-24 Commend Summary
ESC ! n
n
27 33
Master Select