Addressing Modes

Addressing Mode       Format of Address      Default Segment Register
Register                   register                    None

Immediate                    data                      None

Register Indirect            [BX]                       DS
[BP]                       SS
[DI]                       DS
[SI]                       DS

Base Relative*            label [BX]                    DS
label [BP]                    SS

Direct Indexed*           label [DI]                    DS
label [SI]                    DS

Base Indexed*           label [BX + SI]                 DS
label [BX + DI]                 DS
label [BP + SI]                 SS
label [BP + DI]                 SS

String Instructions         source                     DS:SI
destination                   ES:DI

*  Label [...] can be replaced with [displacement + ...].  Therefore,
writing [24 + BX] would produce the address 24 + BX.

Note:          Many of the string instructions use ES:DI for the
destination and DS:SI for the source.

Assembly - Adressing Modes