Epson SQ-2000, Operating Manual

Page: 105 / 181

Chapter 7
Using the Hex Dump Feature
The SQ-2000 has the ability to print the hexadecimal number
of each code that it receives, instead of interpreting the codes as
characters and commands as it normally does. This is a great tool
for locating problems in programs that work with the printer.
The hex dump feature is turned on by holding down both the
LF and FF buttons while you turn the printer on. To turn it off
simply turn the printer off and back on again.
When debugging a system, a good place to start is to attempt
to print all the ASCII codes to see which ones don’t work correct-
ly. If you are using BASIC the following program will do the
trick:
10 FOR X=0 TO 255
20 LPRINT
CHR$( X);
30
NEXT X
A perfect printout using the hex dump feature will look like
Figure 7-l. Press the ON LINE button to print the last line, and
remember to put the printer back on-line before you print any
more.
Figure 7-1. Hex dump feature
87