Epson 8900 Series - Manual (Page 180)

Epson FX Printer Emulation Mode 8-28
These commands cause the printer to print characters at about 60
percent of their normal widths. For example, for a character pitch of
10 cpi, one inch of text contains about 17 characters instead of the
normal 10. These commands are valid for either draft or LQ printing.
Cancel Compressed Print
Control character: DC2
Hexadecimal:
12
Select Letter-Quality Print
Escape sequence: ESC x SOH
Hexadecimal: 1B 78 01
Cancel Letter-Quality Print
Escape sequence: ESC x NUL
Hexadecimal: 1B 78 00
This command cancels LQ print and returns the printer to the draft
print mode.
Select Text-Underline Print
Escape sequence: ESC - SOH
Hexadecimal: 1B 2D 01
After receiving this command, the printer underlines all subsequent
text characters (including the space character) until it receives a
Cancel Text-Underline Print command.
Cancel Text-Underline Print
Escape sequence: ESC - NUL
Hexadecimal: 1B 2D 00
Select Boldface Print
Escape sequence: ESC G
Hexadecimal: 1B 47