Compuprint MDP40B Programmer Manual - Manual (Page 107)

A-105
ESC U
Sets printing direction.
(IBM Proprinter XL24/XL24E, 2391+, 4722, 9068, EPSON ESC/P2)
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.