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INT 10 - VIDEO - WRITE CHARACTERS ONLY AT CURSOR POSITION
        AH = 0Ah
        AL = character
        BH = display page - alpha mode
        BL = color of character (graphics mode, PCjr only)
             if bit 7 set in graphics mode, character is xor'ed onto screen
        CX = number of times to write character
             (EGA) in graphics modes, replication count in CX works correctly
             only if all character written are contains on the same row
Note:   all characters are displayed, including CR, LF, and BS
SeeAlso: AH=08h,09h