Select video DAC color page (INT 10h, 1013h)

        Entry:
          AX = 1013h
          BL = 00h Select paging mode
                  BH = 00h Select 4 blocks of 64
                  BH = 01h Select 16 blocks of 16
          BL = 01h Select Page
                  BH = page number (00h to 03h) or (00h to 0Fh)

        Note: Not valid in mode 13h