Brother TD-4100N - Manual (Page 66)

n1: the remainder from dividing the number of dot positions by 256
n2: the quotient from dividing the number of dot positions by 256
・ First, the data is lined up in one row as follows:
・ One dot of image data is enlarged to 6 dots vertically by 6 dots horizontally.
・ As a result, the image is 48 dots vertically by (n1 + n2 *256) * 6 dots horizontally.
66
B7 B6 B5 B4 B3 B2 B1 B0
Relationship between the image data and the dots
１ｂ
ｙｔｅ
１ｂ
ｙｔｅ
１ｂ
ｙｔｅ
１ｂ
ｙｔｅ
…
１ｂ
ｙｔｅ
１ｂ
ｙｔｅ
n1＋n2*256 byte
MSB
LSB