5525B/31/32 Line Matrix Printer LinePrinter Plus Programmer's Reference

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Chapter 4 Configuring the Epson FX-1050 Emulation with Control Codes
Select Italic Character Set
ASCII Code ESC t n
Hex Code 1B 74 n
Dec Code 27 116 n
Purpose Selects the italics characters from hex 80 through hex FF, or
selects the graphics characters from hex 80 through hex FF.
where
n = hex 01 selects the graphics character set
n = hex 00 selects the italics character set
Discussion The graphics character set is the IBM Graphics Code Page 437.
Select 9-Pin Graphics Mode
ASCII Code ESC ^ m n1 n2 d1 ... dk
Hex Code 1B 5E m n1 n2 d1 ... dk
Dec Code 27 94 m n1 n2 d1 ... dk
Purpose Turns on 9-pin bit image graphics mode.
Discussion
m defines the plot density as shown in Table 30 on page 131.
n1 + 256 n2 = The total number of columns.
n1 = (Number of DATA bytes) - 256( n2 )
(remainder of division of number of DATA bytes by 256,
sometimes referred to as MOD 256)
n2 = (Number of DATA bytes) / 256 (quotient of division)
This mode requires two bytes of graphic data for every column of
print. Each column is sent as a pair:
d1, d3, ... d ( k -1) set the top
8 bits of a normal dot column, just like ESC K;
d2, d4, ... dk set
the ninth dot in the column (the most significant bit) just below
the bottom-most dot of columns
d1, d3, ... d ( k -1).