+# | 0 | . | $OM |
+# | $Op | $On | |
+# |_______kpZRO_______|__kpDOT__|_kent_@8_|
+#
+# ka2, kb1, kb3 and kc2 are extensions, as are the mixed-case names.
+# There are no termcap equivalents for these extensions.
+#
+# kpCMA (comma) is used here for the VT100 keypad, which xterm emulates with
+# shifted-keypad-plus, though normally that invokes a font-size change.
+#
+# Old versions of xterm, e.g., xterm-xfree86, documented \EOE as kb2, which
+# does not fit into this layout. The extension kp5 fits, but is not visible
+# to termcap applications. As an alternative, kbeg (which does have a termcap
+# equivalent) is provided.