Epson FX-BO Operation Manual page 51

(3) Escape codes
In order to expand its processing capability, the FX-80 is provided with control
codes called the ESC sequence.
ESC code (27)D followed by any alphanumeric or symbolic character (MSB is
ignored.), gives special functions to the printer.
For example,
1) To set column length
2) To enter Bit image print mode, etc.
In ESC sequence codes, a, n or m represent 7- or 8-bit binary numbers.
Depending on the MSB control codes, the following values are derived.
(i) MSB
=
1 128 to 255
(ii) MSB
=
0
o
to 127
-
(iii) MSB
=
as it is
o
to 255
Generally, printer control codes, especially like "ESCAPE", i.e., CHR$(27), are
not standardized. Every computer and printer manufacturer applies its own
meaning to such codes.
The "ESCAPE" codes used in the printer should not be confused with the escape
key which some computers have. So be familiar with these control codes.
(4) Buffer-full print
When a full line of print data (including spaces) has been input and the next data is
valid and printable, the contents of the print buffer will be automatically printed
followed by a line feed. Printing in this manner is called "Buffer-full print."
At this time, the Enlarged mode set by the SO code is cancelled.
When power is applied to the printer, the column width in each print mode
becomes as follows;
Normal mode 80 columns
Condensed mode 132 columns
The column width may be changed by the ESC Q code (right margin setting).
However, since the right margin is set as an absolute position, the column width set
to 80 columns in the normal mode will become 137 columns, in the Condensed
mode.
Also, when the left margin is set by ESC I, the buffer becomes full at the right
margin setting in effect at that time.
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