HP-UX TN3270 R7 Administration Guide

Migrating from Earlier Versions of TN3270
Summary of Migrating from TN3270 Release 4 to TN3270 Release 6
Appendix A78
Trace File Format
The format of trace files has changed slightly. In addition to the
hexadecimal listing, message data is now interpreted both as EBCDIC
and as ASCII in two separate columns rather than being interpreted
character-by-character as either ASCII or EBCDIC.