User`s manual

8–52 IBM Proprinter Emulation
Unidirectional Printing
ASCII Code ESC U n
Hex Code 1B 55 n
Dec Code 27 85 n
Purpose Sets or cancels unidirectional printing for text.
Discussion An ESC U code sets or cancels unidirectional printing for text, as
follows:
n = odd selects unidirectional text printing.
n = even cancels unidirectional text printing.
An ESC U code can occur at any place in the datastream and is acted upon
immediately.
All numerical parameters are in the 00 to FF hex range unless stated
otherwise.