Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Segment Register (sreg) Field
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     The three-bit segment register (sreg) field specifies one of the
     following segment registers:
 
     sreg     Register Name
 
     000      ES
     001      CS
     010      SS
     011      DS
     100      FS (386+)
     101      GS (386+)
 
     If a memory operand has a segment override, the entire instruction
     has one of the following bytes as a prefix:
 
     Prefix     Register Name
 
     26h        ES
     2Eh        CS
     36h        SS
     3Eh        DS
     64h        FS (386+)
     65h        GS (386+)
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