The program wsfcomp.exe can be used to create font files (.fon files)
from so-called "font source files" (.fsc files).

Eg to compile diary.fsc to produce diary.fon just type
    wsfcomp diary

The format of font source files can be judged by looking at the
example .fsc files supplied:
    sys$norm.fsc    source of the Series3 system font
    sys$bold.fsc    source of the Series3 bold font
    sys$digt.fsc    source of the Series3 "digits" font
    diary.fsc       special characters used in the Agenda display
    shgraph.fsc     the "tiny" font used in the Spreadsheet
    sh3.fsc         other special characters used by the Spreadsheet
    bold.fsc        a "Greek" flavour version of sys$bold.fsc
    norm.fsc        a "Greek" flavour version of sys$norm.fsc

A font source file contains a header section followed by patterns
which make up the font, as in the following extract from the
beginning of a font source file:

    *name System mono
    *descent 2
    *height 10
    *maxwid 7
    *flag ascii
    *flag cp850

    *char 28
    
    100000000000
    100001100000
    100001100000
    101111111100
    100111111000
    110011110111
    000001100000
    000000000000
    111111111111
    100000000000

    0000000
    0000000
    0001000
    0001100
    1111110
    1111110
    0001100
    0001000
    0000000
    0000000

    0000000
    0000011
    0000011
    0010011
    0110011
    1111111
    1111111
    0110000
    0010000
    0000000

The keywords have the following meanings:
-----------------------------------------

*name           The font name (maximum length 16 characters)

*descent <n>    The descent for the font

*height <n>     The height for the font

*maxwid <n>     Not the real maximum width, but the width of the
                widest normal character

*flag           Some informational flags

*char <n>       Skip all characters up to the specified code. 
                Character codes start at 0 and follow sequentially
                until the next *char statement

The keyword "*special 1" may also be present, to specify a font
suitable for "fast" blitting onto the screen.  If present, this
keyword must come before the *height statement.  ("Fast" fonts must
have all their widths less than 9 pixels.)

If the height of a character defined is less than that defined in the
header, blank rows are added at the top.

Possible values for "*flag" (each one defined on its own line) are
"ascii", "cp850", "bold", "italic", and "serif".

For some more details about fonts, see eg the section on gINFO in the
Opl Programming Manual.

Note that only the first letter of keywords and flagnames is
significant.  Thus "*max_width" and "*maxwid" have the same effect.

One tip when editing .fsc files is to temporarily change all '1's
into graphics square characters (ascii 219, say), and all '0's into
dots.  Then change them back when you're finished.