sxmo-utils/scripts/core/sxmo_xinit.sh contains a minor error in the xdefaults() section
The xrdb command for xresources_dmenu replaces the xresources_xcalc values loaded on the line preior to it.
Changing to 'xrdb -merge /usr/share/sxmo/appcfg/xresources_dmenu.xr' restores the intended behaviour.
Also sxmo-utils//configs/appcfg/xresources_xcalc.xr contains a typo on line 48, a missing '' in 'xcalcti'
Applying these changes gives a nice colourful Xcalc.
There are three issues with the terminus font: the 'square root' sign is not shown, Pi is rendered as 'P' and the 'divide' button is rendered as a comma. Apparently Xcalc uses the 'Adobe Symbol' font which has the correct symbols.
Pending finding out how to install Adobe Symbol on PMOS, I added:
A font size of terminus 48 seems about right with the dpi modified to 192 as in Ticket 193.
To make the symbols for square root, pi and division appear correctly in xcalc, install the font-adobe-100dpi package, and append the following lines to xresources _xcalc.xr:
xcalc*ti.button3.font: -adobe-symbol-*-*-*-*-*-240-100-100-*-*-*-* xcalc*ti.button21.font: -adobe-symbol-*-*-*-*-*-240-100-100-*-*-*-* xcalc*ti.button35.font: -adobe-symbol-*-*-*-*-*-240-100-100-*-*-*-*
and remove or comment with '!' the xcalc*ti.button??.label lines above
Font size was set in the previous line to xcalcfont: --terminus-----48-------*
Logout/login is needed to load the modified Xresources. on the previous line. This gives OK font sizes for me with Xorg dpi set to 192 as in Ticket #193