
The font menu through Ctrl-Button3 is also problematical. Though, my laptop has no numeric keypad, so unfortunately this won't work, at least not without some serious X key remapping. I had forgotten about the Shift-Keypad method. One reason is that with a laptop, everything is different than the 17" CRT, and bigger fonts are needed on the higher resolution screen.

Thanks for this post, it's a topic that's been in the back of my mind (among many others). If you use 'less' as pager for the man pages. The xterm man page is quite long but this site also has a nice version of the xterm man page :
#Uxterm font size plus
In my case the " shifted keypad plus or minus keys" only made the fonts smaller, not larger, so my quest for a larger font size continued. If you are instead asking about a problem displaying a given font, it may be due to a problem with your resource settings. Xterm's manpage does not document the syntax for X resources it is done in the X documentation. Modern xterm provides the menu, plus a feature adapted from rxvt: pressing the shifted keypad plus or minus keys steps through the font menu selections, in order of their size. Usually these are in increasing order of size. Control right mouse button pops up the VT FONTS menu, from which you can select fonts that are specified in xterm's resources.

X Consortium xterm provides popup menus, by pressing the control key together with the mouse button. This is documented in the manpage, in the MENUS section.

You can switch between these fonts at runtime, using a menu. Xterm uses fonts given as resource settings.
