Epson Apex-80 - Manual (Page 103)

ESC” Select 9-Pin Graphics Mode
Format:
ASCII code: ESC ˆ m n1 n2
Decimal: 27 94 m n1 n2
Hexadecimal: 1B 5 E
m n1 n2
Comments:
Turns on 9-pin Graphics Mode. For this command the variable m
defines density of print (0 for single and 1 for double). The total
number of columns = nl + (n2 x 256). This mode requires two
data items for each column of print.
A-32 Command Summary