Oki ML1120 - Set;Reset Half Speed Printing

Technical Reference Guide – Command descriptions > 97
ML1120 eco: EPS FX
Function:
Unidirectional printing for one line only will be performed.
> Additional details:
The line is printed from left to right.
Subsequent lines will be printed, bidirectionally, according
to short line seeking priorities logic.
This command returns the printhead to the start of the
print line before printing begins.
S ET / RESET HALF SPEED PRINTING
> Code: ESC s n
> Compatibility:
ML1190 eco: EPSON LQ/IBM
ML1120 eco: EPS FX/IBM III
> Function:
The printer starts/stops printing at 50% of normal speed
upon receipt of this command depending on the value of n.
> Range:
n = 01H, 31H, 81H, or B1H SET half-speed printing.
n = 00H, 30H, 80H, or B0H SET full speed printing.
> Out of range
This command will be ignored if n equals a value other than
the values mentioned above.
> Additional details:
Half Speed mode can be used to reduce printer noise.
If the print speed is slower than the printer’s physical
lowest speed, the half speed command is ignored and data
is printed at that lowest speed.