X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - format of alphanumeric character set override:

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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

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