The program setfont will accept font descriptions like
# combine partial fonts
none.00-17.16
ascii.20-7f.16
none.00-17.16
8859-1.a0-ff.16
# combine partial fonts
and the remaining lines contain filenames for PSF fonts to load.
The above example (it is the file iso01.16)
describes a font with 256 positions, of which the first 32 are taken
from the file none.00-17.16, the following 96 from
ascii.20-7f.16, the following 32 from
none.00-17.16 again, and the final 96 from
8859-1.a0-ff.16.
In this way all ISO 8859-* fonts of a given pointsize (here 16)
can share the same initial 160 positions.