Format of Alphanumeric Character Set Override

Offset  Size    Description
 00h   BYTE    Length in bytes of each character in font table
 01h   BYTE    Character generator RAM bank to load, 0=normal
 02h   WORD    Number of characters in font table, normally 256
 04h   WORD    Code of first character in font table, normally 0
 06h   DWORD   ptr to font table
 0Ah   BYTE    Displayable rows (FFh=use maximum calculated value)
 0Bh   BYTEs   Array of mode values to which this font is to pertain
   BYTE    FFh end of array