Intel 386 User Manual
Page 642
E-5
INSTRUCTION SET SUMMARY
SUB = Subtract
register from register
0 0 1 0 1 0 d w
mod reg r/m
2
2
register from memory
0 0 1 0 1 0 0 w
mod reg r/m
7**
7**
b
h
memory from register
0 0 1 0 1 0 1 w
mod reg r/m
6*
6*
b
h
immediate from
register/memory
1 0 0 0 0 0 s w
mod 101 r/m
immediate data
2/7**
2/7**
b
h
immediate from accu-
mulator (short form)
0 0 1 0 1 1 0 w
immediate data
2
2
SBB = Subtract with borrow
register from register
0 0 0 1 1 0 d w
mod reg r/m
2
2
register from memory
0 0 0 1 1 0 0 w
mod reg r/m
7**
7**
b
h
memory from register
0 0 0 1 1 0 1 w
mod reg r/m
6*
6*
b
h
immediate from
register/memory
1 0 0 0 0 0 s w
mod 0 1 1 r/m
immediate data
2/7**
2/7**
b
h
immediate from accu-
mulator (short form)
0 0 0 1 1 1 0 w
immediate data
2
2
DEC = Decrement
register/memory
1 1 1 1 1 1 1 w
reg 0 0 1 r/m
2/6
2/6
b
h
register (short form)
0 1 0 0 1 reg
2
2
CMP = Compare
register with register
0 0 1 1 1 0 d w
mod reg r/m
2
2
memory with register
0 0 1 1 1 0 0 w
mod reg r/m
5*
5*
b
h
register with memory
0 0 1 1 1 0 1 w
mod reg r/m
6*
6*
b
h
immediate with
register/memory
1 0 0 0 0 0 s w
mod 1 1 1 r/m
immediate
data
2/5*
2/5*
b
h
immediate with accu-
mulator (short form)
0 0 1 1 1 1 0 w
immediate
data
2
2
NEG = Change sign
1 1 1 1 0 1 1 w
mod 0 1 1 r/m
2/6*
2/6*
b
h
AAA = ASCII adjust for
addition
0 0 1 1 0 1 1 1
4
4
AAS = ASCII adjust for
subtraction
0 0 1 1 1 1 1 1
4
4
DAA = Decimal adjust
for addition
0 0 1 0 0 1 1 1
4
4
DAS = Decimal adjust for
subtraction
0 0 1 0 1 1 1 1
4
4
Table E-1. Instruction Set Summary (Sheet 4 of 19)
Instruction
Format
Clock Count
Notes
Real
Ad-
dress
Mode
or
Virtual
8086
Mode
Pro-
tected
Virtual
Ad-
dress
Mode
Real
Ad-
dress
Mode
or
Virtual
8086
Mode
Pro-
tected
Virtual
Ad-
dress
Mode