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
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