INT 50 - IRQ0 relocated by DESQview
Notes:  this is the default location for older versions; DESQview v2.26+
          searches for unused ranges of interrupts and uses the lowest
          available range in its list for relocating these IRQs and the next
          lowest for relocating IRQ8-IRQ15
        a range of eight interrupts starting at a multiple of 8 is considered
          available if all vectors are identical and it has not been excluded
          with an /XB:nn commandline switch
        the list of ranges for v2.26 is 50h,58h,68h,78h,F8h (if < two of these
          are available, F8h and then 50h are used anyway)
        the list of ranges for v2.31+ is 68h,78h,88h-B8h,F8h (if < two of these
          are available, F8h and then F0h are used anyway)
SeeAlso: INT 51"DESQview",INT 54"DESQview",INT 58"DESQview"