This vector (0:010c) is a pointer to a table of Font Definition Data that
defines all ASCII characters that will be used to display text (via
INT 10H 0eH et al.) while in graphics mode on EGA and VGA video systems.

A copy of a font is maintained is easily-accessible memory (usually ROM)
to that BIOS fns such as INT 10H 08H (read character from screen) can
compare sets of graphics pixels against the defined characters in order to
return an ASCII value.

See Font Definition Data for a layout of this data.  The size of the
entries (bytes-per-character) varies according to the value in 40:0085

See Also: INT 1fH (CGA Graphics Character Font Pointer)
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INT 43H: EGA/VGA Graphics Character Font Pointer