Int 10 Fn CD10  - Video - Ultravision - Load User Font (ega,vga)           [V]

   AX = CD10h
   BH = bytes per character (08h,0Ah,0Bh,0Eh,13h,14h)
   CX = ABCDh load 9xN alternate font (v2+)
      else number of characters to load
       DX = character offset into font table
       DS:SI -> 8-byte ASCII font name
   ES:BP -> font definitions

Return: AX = FFFFh if invalid font parameters

Notes: loads the designated characters into UltraVision's resident font area
   should be followed by a video mode set to reload character generator

See Also: AX=1100h,AX=1103h