Epson TM-T88II Series Operator's Manual page 38

Notes:
Printing speed may be slower, depending on the data transmission
speed and the combination of control commands.
There may be variations in printing after switching the mode of the
printing speed. To prevent this for logo printing, using a
downloaded bit image is recommended. (Change in printing speed
does not occur during downloaded bit image printing).
Paper feeding speed:
Line spacing (default): 4.23 mm (1/6")
Number of characters: Alphanumeric characters: 95
Character structure:
4-2 Reference Information
Approximately 120 mm/second
(approximately 4.72"/second) continuous
paper feeding
Programmable by control command.
International characters: 32
Extended graphics: 128 7 pages
(including one space page)
kanji chareacters: JIS-Level 1, Level 2
Font A: 12 24 (including 2-dot spacing
in horizontal)
Font B: 9 17 (including 2-dot spacing in
horizontal)
Kanji: 24 24
Font A is the default
(JIS X0208-1990)