Oki ML5520 User Manual page 17

Hexadecimal dump mode
When the printer is placed in the Hexadecimal Dump Mode, all data received, including text
and printer commands, is printed in both hexadecimal and ASCII format.
For example, the following line of BASIC code
LPRINT CHR$ (27);"0";CHR$ (30);"THIS IS AN EXAMPLE OF A HEXADECIMAL DUMP."
would print like this:
NOTE
In the ASCII format, all non-printable characters are represented by a period.
To engage the Hexadecimal Dump Mode:
Make sure paper is loaded.
1. Turn the printer OFF.
2. Hold the SEL and FF/LOAD keys for several seconds while turning on the printer.
To exit the Hexadecimal Dump Mode:
1. Press the SEL key.
or
Turn the printer off, then on again.
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