Intel 80C188XL - Manual (Page 58)

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OVERVIEW OF THE 80C186 FAMILY ARCHITECTURE
Figure 2-12. Memory Address Computation
The displacement is an 8- or 16-bit number contained in the instruction. The displacement gen-
erally is derived from the position of the operand’s name (a variable or label) in the program. The
programmer can modify this value or explicitly specify the displacement.
A1015-0A
CS 0000
0000
0000
0000
SS
DS
ES
Assumed Unless
Overridden
by Prefix
Explicit
in the
Instruction
Encoded
in the
Instruction
Single Index Double Index
or
or
or
Physical Addr
Effective
Address
BX
BP
SI
DI
or
or
or
BX
BP
or
SI
DI
or
EU
BIU
Displacement
+
+ +
+ +