Toshiba B-EP Series Interface Specification page 549

[Print example]
Single density (m = 0)
8-dot single density:
1-byte data is tripled in the vertical direction,
and doubled in the horizontal direction.
2 dots
24 dots
d1 d2 d3
24-dot single density:
1-byte data is doubled in the horizontal
direction.
2 dots
d1 d4 d7
24 dots
d2 d5 d8
d9
d3 d6
b7
Expanded
b0
b7
b0
8-22
CHAPTER 8 ESC/POS MODE (INTERFACE COMMANDS)
8-dot double density:
1-byte data is tripled in the vertical
direction.
1 dot
24 dots
d1 d2 d3
24-dot double density:
1-byte data is edited in sequence.
1 dot
d1 d4 d7
24 dots
d2 d5 d8
d3 d6 d9
B-EP Series
b7
Expanded
b0
b7
b0