Brother TD-2120N - Manual (Page 76)

ESC/P Command Reference
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5. Control Command Details
ESC Y 8-dot double-speed double-density bit image
ASCII: ESC Y n1 n2 Data
Decimal: 27 89 n1 n2 Data
Hexadecimal: 1B 59 n1 n2 Data
Parameters
0≤n1≤255, 0≤n2≤3
The data contains n1+n2*256 bytes of image data.
Description
 Same as for an 8-dot double-density bit image. Horizontally neighboring dots are not omitted.
ESC Z 8-dot quadruple-density bit image
ASCII: ESC Z n1 n2 Data
Decimal: 27 90 n1 n2 Data
Hexadecimal: 1B 5A n1 n2 Data
Parameters
0≤n1≤255, 0≤n2≤7
The data contains n1+n2*256 bytes of image data.
Description
Specifies that an 8-dot quadruple-density bit image is printed with the number of dot positions indicated by n1
and n2.
 Same behavior as M=3 specified in ESC *.
 Horizontally neighboring dots are not omitted.