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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 OD and OA.
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 ESCape “E” and a car-
riage return and line feed. These are hex codes
1B, 45,
OD, and OA,
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.
Some software changes one or more codes when sending them to
the printer. The ability of the LX-90 to dump in hexadecimal lets you
determine which codes are creating problems for your system.
A data dump printout of a program shows exactly what the printer
is receiving, regardless of what the computer is sending. The following
program run in the data dump mode can show how the computer and
BASIC handle certain codes.
10 FOR X=0 TO 255
20 LPRINT CHR$(X);
30
NEXT X
After you type this program, put the printer in data dump mode
and run the program. Remember to press the ON LINE button to
make the LX-90 print the final line. Then compare your printout with
the list of hex codes in order in Figure
E-l.
If any are skipped or
repeated, you will know that your software changes some codes
before it sends them to the printer.
E-6