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REF
REFERENCES
FOR INSTRUCTION SET
REF
"reg"
Field Bit Assignments:
16-Bit
(w = 1)
8-Bit
(w =
0)
Segment
000
AX
000
AL
00
ES
001
CX
001
CL
01
CS
010
OX
010
OL
10
SS
011
BX
011
BL
11
OS
100
SP
100
AH
101
BP
101
CH
110
SI
110
OH
111
01
111
BH
"mod"
Field Bit Assignments:
Imod
xxx
r/ml
mod
Displacement
00
OISP = 0*,
disp-Iow
and
disp-high
are
absent
01
OISP =
disp-Iow
sign-extended
to 16-bits,
disp-high
is
absent
10
OISP =
disp-high:
disp-Iow
11
rIm
is
treated
as a
"reg"
field
"r
1m"
Field Bit Assignments:
rim
Operand
Address
000
(BX) + (SI) + OISP
001
(BX) + (01) + OISP
010
(BP) + (SI) + OISP
011
(BP) + (01) + OISP
100
(SI) + OISP
101
(01) + OISP
110
(BP) + OISP
111
(BX) + OISP
OISP
follows
2nd
byte
of
instruction
(before
data
if
required).
*except
if
mod
=
00
and
rIm
=
110
then
EA =
disp-high:
disp-Iow.
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