Epson 8900 Series - Manual (Page 163)

Epson FX Printer Emulation Mode 8-11
Initialize Printer
Escape sequence: ESC @
Hexadecimal: 1B 40
This command resets the printer to its initial state and clears the print
buffer of all printable data from the last line printed before the
command was received.
Set Most Significant Bit to Zero
Escape sequence: ESC =
Hexadecimal: 1B 3D
Some computers, when sending characters from 7-bit character sets,
automatically set the most significant bit (MSB) of each character to 1.
This causes the printer to print all received characters as italics or
character graphics. To prevent this, the Set Most Significant Bit to
Zero command sets the MSB of each subsequently received character
to 0.
Set Most Significant Bit to One
Escape sequence: ESC >
Hexadecimal: 1B 3E
This command sets the MSB of all subsequently received characters
to 1. This enables the printer to select characters from either the
italics character set or the extended graphics character set.