Brother MW-260 - Manual (Page 40)

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ESC Z 8-dot bitmap image (quadruple density)
[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
In data, the image data is n1 + n2 * 256 bytes.
[Description]
Specifies that an 8-dot bitmap image (quadruple density) will be printed with the number of dot positions
defined by n1 and n2.
・ Specify n1 and n2 in the same way as with ESC K.