struc DisplayMode
 dmInfoLevel    db ?            ; Information level (must be zero)
 dmReserved1    db ?            ; Reserved
 dmDataLength   dw ?            ; Length of remaining data, in bytes (14d)
 dmFlags        dw ?            ; Control flags (0|1=intensity off|on)
 dmMode         db ?            ; Display mode (1=text; 2=graphics)
 dmReserved2    db ?            ; Reserved
 dmColors       dw ?            ; Number of colors available
 dmWidth        dw ?            ; Screen width in pixels (graphics)
 dmLength       dw ?            ; Screen length in pixels (graphics)
 dmColumns      dw ?            ; No. of text columns
 dmRows         dw ?            ; No. of text rows
ends                            ; = 18d bytes