Epson Apex 80 User Manual page 116

The hexadecimal numbers are the codes received by the printer, and
the guide section helps you find a certain place in the list of codes.
Each character in the guide section corresponds to one of the codes. If
the code is for a printable character, that character is printed. If the
code is for a non-printable character, such as ESC or the code for a line
feed or carriage return, a dot is printed.
Therefore, if you run the following BASIC program while your
Apex80 is in the data dump mode, you get the printout below it. The
printer prints all but this last line and then stops. Press the
LINE
button to make the printer print the last line.
10 FOR X=70 TO
20 LPRINT CHR$(X): NEXT X
30
LPRINT
40
LPRINT
50 LPRINT CHR$(27)"@"
Data Dump Mode
0 0 0 0 4 6 OD OA 4 7 OD OA 4B 0D OA 4 9 OD 0A 1B 4 5 OD 0A
0001 5 3 61 6D 7 0 6C 6 5 2 0 7 4 6 5 7 8 74 OD OA 1B 4 0 OD
0 0 0 2 0 A
You can consult Appendix A or the Quick Reference card to see the
meaning of the hexadecimal codes. Here is an explanation of the first
line to put you on the right track for using the data dump mode.
The first code in line 0000 is hex 46, which is the same as decimal 70,
which is the code for "F"; therefore "F" is printed in the first position
in the guide section. Then, because there is no semicolon in line 20,
BASIC sends a carriage return and a line feed, hex codes 0D and 0A.
Each of these is represented by a dot in the guide section. The program
then sends the hex codes 47, 48, and 49, with each followed by a
carriage return and line feed.
When the program gets to line 30, it sends ESC E and a carriage
return and line feed. These are hex codes lB, 45, 0D, and 0A, which
are represented in the guide section by a dot, an "E," and two more
dots.
Now you can follow a data dump printout on your own.
Problem Solving and Maintenance
73
CHR$(27)"E"
"Sample text"
ON/OFF
F . . G . . H . . I . . . E . .
Sample text. . . @.
C-5