◄Key to Encodings►  ◄Reg►  ◄Mod►  ◄R/m►  ◄Back►
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  This 2-bit field indicates addressing mode, in conjunction with r/m.
 
  00   If r/m is 110, a direct memory operand is used; otherwise, an
       indirect memory operand is used with no displacement.
 
  01   An indirect memory operand is used with an 8-bit displacement.
 
  10   An indirect memory operand is used with a 16-bit displacement.
 
  11   Instruction is register-to-register. The reg field specifies
       the destination, and the r/m field specifies the source.
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