Oki ML1120 Technical Reference Manual page 119

Mode of DLL data depends on the current print mode which
is LQ, Utility or Proportional.
> Range:
m selects the available area in RAM. Only available area is
m = 0 or 128.
n1 = 00 – 127, Starting character location
n2 = n1 – 127, Ending character location
Character width limits are shown as follows:
d0: leading space width
d1: character width
d2: trailing space width
MODE
UTILITY
LQ
PROPORTIONAL
> Out of range:
n1 = n2: One character loaded.
n1 > n2: Data up to n2 is dumped and this command is
ignored.
80H <= n1, n2: Ignored from ESC to n2.
> Additional details:
To define a character, a grid that is 24 dots high is used,
one dot for each wire. The width of the character matrix is
dependent upon the character set in use (i.e. LQ, Utility or
Proportional).
Dots in the same row may not print in adjacent columns.
There must be an empty dot position to the left and to the
right of each dot that prints. This is true for Utility, LQ, and
Proportional. (See illustrations for character print
positioning).
Each vertical column (which has a maximum of 24 dots) is
first divided into three groupings of 8 dots. Each group of
8 dots is represented by one byte.
Technical Reference Guide – Command descriptions > 119
D1 (MAX)
15
37
37
D0 + D1 + D2 (MAX)
18
42
42