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Intel 8086
The Intel 8086 chip is almost identical to the 8088, except that it uses a 16-bit-wide
data bus instead of the 8-bit bus of the 8088. It was actually invented before the 8088
but was not chosen for the original PC because IBM wanted to keep costs down by going with
an 8-bit bus design.
The 8086 was used in some PC clones and later on in early IBM PS/2 models, but was
never a popular choice for PCs. This is probably because by the time it started to be
used, the 80286 was introduced, offering much improved performance over the 8086. The 8086
is architecturally identical to the 8088 aside from the wider data bus.
 Note: The NEC V30 is an
8086-compatible but actually delivers slightly better performance due to a slightly more
efficient internal design.
Note: Original designs were
made in NMOS, newer ones in CMOS (80C86) for lower power consumption.
Look here for an explanation of the categories in the processor
summary table below, including links to more detailed explanations.
General
Information |
Manufacturer |
Intel |
Family Name |
8086 |
Code name |
-- |
Processor Generation |
First |
Motherboard
Generation |
First |
Version |
8086 |
8086-8 |
8086-10 |
Introduced |
June 1978 |
!? |
Variants and Licensed
Equivalents |
80C86, AMD 8086, NEC V30 |
|
Speed
Specifications |
Memory Bus Speed
(MHz) |
4.77 |
8 |
10 |
Processor Clock
Multiplier |
1.0 |
Processor Speed (MHz) |
4.77 |
8 |
10 |
"P" Rating |
-- |
Benchmarks |
iCOMP Rating |
-- |
iCOMP 2.0 Rating |
-- |
Norton SI |
!? |
!? |
!? |
Norton SI32 |
-- |
CPUmark32 |
-- |
Physical
Characteristics |
Process Technology |
NMOS, CMOS |
Circuit Size
(microns) |
3.0 |
Die Size (mm^2) |
33 |
Transistors
(millions) |
0.029 |
Voltage,
Power and Cooling |
External or I/O
Voltage (V) |
5 |
Internal or Core
Voltage (V) |
5 |
Power Management |
None |
Cooling Requirements |
None |
Packaging |
Packaging Style |
40-Pin DIP |
Motherboard Interface |
DIP socket |
External
Architecture |
Data Bus Width (bits) |
16 |
Maximum Data Bus
Bandwidth (Mbytes/sec) |
9.1 |
15.3 |
19.1 |
Address Bus Width
(bits) |
20 |
Maximum Addressable
Memory |
1 MB |
Level 2 Cache Type |
None |
Level 2 Cache Size |
-- |
Level 2 Cache Bus
Speed |
-- |
Multiprocessing |
No |
Internal
Architecture |
Instruction Set |
8088 |
MMX Support |
No |
Processor Modes |
Real |
x86 Execution Method |
Native |
Internal
Components |
Register Size (bits) |
16 |
Pipeline Depth
(stages) |
1 |
Level 1 Cache Size |
None |
Level 1 Cache Mapping |
-- |
Level 1 Cache Write
Policy |
-- |
Integer Units |
1 |
Floating Point Unit /
Math Coprocessor |
Optional 8087 Coprocessor |
Instruction Decoders |
1 |
Branch Prediction
Buffer Size / Accuracy |
None |
Write Buffers |
None |
Performance Enhancing
Features |
None |
 Next: Second Generation
Processors
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