Epson 8900 Series - Manual (Page 184)

Epson FX Printer Emulation Mode 8-32
Select 9-Pin 60 dpi Graphics
Escape sequence: ESC ^ NUL n1 n2
Hexadecimal: 1B 5E 00 n1 n2
This command causes the printer to print 9-pin graphics at 60 dpi.
Select 120 dpi Graphics
Escape sequence: ESC L n1 n2
Hexadecimal: 1B 4C n1 n2
This command selects the 8-pin, 120 dpi graphics mode for the
horizontal distance specified by the two-byte variable n1 n2.
Select 9-Pin 120 dpi Graphics
Escape sequence: ESC ^ SOH n1 n2
Hexadecimal: 1B 5E 01 n1 n2
This command causes the printer to print 9-pin graphics at 120 dpi.
Select High-Speed 120 dpi Graphics
Escape sequence: ESC Y n1 n2
Hexadecimal: 1B 59 n1 n2
This command selects the 8-pin, high-speed 120 dpi graphics mode
for the horizontal distance specified by the two-byte variable n1 n2.
This is identical to the 120 dpi graphics mode except that the printing
speed is doubled.
Select 240 dpi Graphics
Escape sequence: ESC Z n1 n2
Hexadecimal: 1B 5A n1 n2
This command selects the 8-pin, 240 dpi graphics mode for the
horizontal distance specified by the two-byte variable n1 n2.