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8088
Register Model
Notes:
if d
=
1 then " to"; if d
=
0 then " from "
if w
=
1 then word instruction; if w
=
0 then byte instruction
if s:w
01 then 16 bits of immediate data from the operand
if s:w
=
11 then an immediate data byte is signed extended to form
the 16-bit operand
if v
=
0 the "count"
=
1; if v
=
1 the "count" is in (Cl) or
(CX)
x
=
don't care
z is used for string primitives for comparison with ZF FLAG
Al
8-bit accumulator
AX
16-bit accumulator
CX
=
Count register
DS
=
Data segment
ES
=
Extra
segme~t
Above/below refers to unsigned value
Greater
=
more positive;
less
=
less positive (more negative) signed values
SI
DI
SP
BP
Accumulator
Base
Count
Data
General
Register File
Stack Pointer
Base Pointer
Source Index
Destination Index
Instruction Pointer
Status Flags
Code Segment
Data Segment
Segment
Register File
Stack Segment
Extra
S~gment
FLAGSL
IP
ES
DS
CS
SS
FLAGSH
AH
AL
BH
BL
CH
CL
DH
DL
AX:
BX:
CX:
DX:
Instructions which reference the flag register file as a
16-bit object, use the symbol FLAGS to represent the file:
15
7
o
Instruction Set
- Quick Links:
- Section 1. System Board
- 64/256K System Board
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