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        6845 video init tables (INT 1Dh)

        Table for modes 0 and 1   \
        Table for modes 2 and 3    \ each table is 16 bytes long and
        Table for modes 4,5, and 6 / contains values for 6845 registers
        Table for mode 7          /

        4 words -- size of video RAM for modes 0/1, 2/3, 4/5, and 6/7
        8 bytes -- number of columns in each mode
        8 bytes -- video controller mode byte for each mode


        Format of video init tables:

        Offset  Size    Description
         00h 16 BYTEs   table for modes 0 and 1  \
         10h 16 BYTEs   table for modes 2 and 3   \each table contains values
         20h 16 BYTEs   table for modes 4,5, and 6/for first sixteen 6485 regs
         30h 16 BYTEs   table for mode 7         /
         40h    WORD    size of video RAM for modes 0 and 1
         42h    WORD    size of video RAM for modes 2 and 3
         44h    WORD    size of video RAM for modes 4 and 5
         46h    WORD    size of video RAM for modes 6 and 7
         48h  8 BYTEs   number of colums in each of modes 0 through 7
         50h  8 BYTEs   video controller mode byte for each mode