Compuprint 9058 Programmer Manual - Manual (Page 66)

EPSON/IBM Mode
A78408098-003 64
ESC U
Sets printing direction. (IBM, EPSON)
ASCII Code ESC U n
Hexadecimal Value 1B 55 n
Decimal Value 27 85 n
Selects bidirectional or unidirectional printing, according to the
parameters below:
n Direction
0 Bidirectional printing
1 Unidirectional (left to right) printing
Unidirectional printing provides better alignment of vertical lines
while bidirectional printing is faster.