Real Mode and V86 Mode

                  Real and V86 Modes

  CS = Code Segment               SS = Stack Segment
  DS = Data Segment               ES = Extra Segment

                  for 386 and later,

  FS = another data segment       GS = another data segment


     In REAL or V86 modes, say 'segment registers'
     In PROTECT MODE, say 'selector registers'

Note: In real mode each segment register has a 16-bit number. The segment number is shifted left 4 bits, then added to the offset value. There is no checking of any kind.

         DS=1234,   offset=5678

                          12340
                           5678
                          -----
                          179B8

Note: This is equivalent to any of the following:

segment 179B, offset 8;

segment 1790, offset B8;

segment 1267, offset 5348;

or many other possibilities.