User`s manual

Epson FX Emulation9–60
Unidirectional Printing, 1 line
ASCII Code ESC <
HEX Code 1B 3C
Purpose Causes printing to occur from left to right for one line only.
Comment Printing normally occurs in both directions of shuttle movement.
This command causes the printer to print from right to left for
one line. The command is cancelled by a CR.
Unidirectional Printing, Set/Reset
ASCII Code ESC U n
HEX Code 1B 55 n
Purpose Causes printing to occur in only one direction of shuttle
movement (left to right).
where n = NUL or 0 (hex 00 or 30) turns unidirectional mode off
n = SOH or 1 (hex 01 or 31) turns unidirectional mode on
Comment Printing normally occurs in both directions of shuttle movement.
Unidirectional printing slows the printer down approximately
50%, but is sometimes used when very accurate dot placement is
desired in graphics.