INT 10 - VIDEO - WRITE CHARACTER AND ATTRIBUTE AT CURSOR POSITION
        AH = 09h
        AL = character to display
        BH = page number (00h to number of pages - 1) (see AH=00h)
        BL = attribute (text mode) or color (graphics mode)
             if bit 7 set in graphics mode, character is xor'ed onto screen
        CX = number of times to write character
Notes:  all characters are displayed, including CR, LF, and BS
        replication count in CX may produce an unpredictable result in graphics
          modes if it is greater than the number of positions remaining in the
          current row
SeeAlso: AH=0Ah,AH=4Bh"GRAFIX",INT 17/AH=60h,INT 1F,INT 43,INT 44