This is coded as:

        Rsreg[{+|-}dreg]...[{+|-}nnnnn]...[{+|-}(iiiii)],

where:

sreg

is a segment register and is one of:

CS,DS,SS,ES,FS,GS

Note: The prefix R implies that the adjoined segment register is to be used with an initial offset of zero. Thus RDS refers to data addressed by DS:0

dreg
(optional)

is a data, base or index register. More than one dreg may be used to define a displacement from the segment register value to the memory location. It is one of:

BP,SP,SI,DI,AX,BX,CX,DX,IP

nnnnn
(optional)

is an optional fixed displacement to be added to the address calculated in the registers. If hex the syntax is 0xnnnn.

iiiii
(optional)

is a displacement from the indirect address. If hex the syntax is 0xiiii. This specifies a displacement from the final address when using INDIRECT or IF (Indirect Flat) addressing.

This form of address is calculated at run time.

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