nvtMode resource

From The x3270 Wiki
Type Default Option: -nvt sets to true
Boolean false x3270 c3270 wc3270 s3270 b3270

When true, causes the emulator to not negotiate 3270 mode for all sessions, and to default the terminal name to xterm (if a monochrome display) or xterm-color (if a color display, New in 4.2).

The A: prefix sets this mode for a single session.