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Intel 80286
The 80286 was the chip used in IBM's AT (advanced technology) system. The 286 was the first major step up in PC processors, providing significant performance increases over the 8088 and 8086--double or more performance at the same clock speed. The 286 also widened the address bus to allow access to 16 MB of memory, and introduced protected mode operation. It was originally available in 6 MHz and 8 MHz versions, but was later expanded to faster versions, all the way up to 20 MHz.
The 286 opened up the PC world to many users, but still was used mainly as the equivalent of a "turbo-charged 8088". At this time DOS was still the virtually exclusive operating system, and the protected mode the 286 offered was largely ignored.
The 80286 is of course considered obsolete today.
Look here for an explanation of the categories in the processor summary table below, including links to more detailed explanations.
General Information |
Manufacturer |
Intel |
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Family Name |
80286 |
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Code name |
-- |
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Processor Generation |
Second |
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Motherboard Generation |
Second |
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Version |
80286 |
80286 |
80286 |
80286 |
80286 |
80286 |
|
Introduced |
Feb. 1982 |
!? |
!? |
!? |
!? |
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Variants and Licensed Equivalents |
AMD 286, 286S |
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Speed Specifications |
Memory Bus Speed (MHz) |
6 |
8 |
10 |
12 |
16 |
20 |
Processor Clock Multiplier |
1.0 |
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Processor Speed (MHz) |
6 |
8 |
10 |
12 |
16 |
20 |
|
"P" Rating |
-- |
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Benchmarks |
iCOMP Rating |
-- |
|||||
iCOMP 2.0 Rating |
-- |
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Norton SI |
3.1 |
4.4 |
5.6 |
6.7 |
~9.0 |
~11.5 |
|
Norton SI32 |
-- |
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CPUmark32 |
-- |
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Physical Characteristics |
Process Technology |
CMOS |
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Circuit Size (microns) |
1.5 |
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Die Size (mm^2) |
47 |
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Transistors (millions) |
0.134 |
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Voltage, Power and Cooling |
External or I/O Voltage (V) |
5 |
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Internal or Core Voltage (V) |
5 |
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Power Management |
None |
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Cooling Requirements |
None |
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Packaging |
Packaging Style |
68-Pin PGA |
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Motherboard Interface |
68-Pin Socket |
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External Architecture |
Data Bus Width (bits) |
16 |
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Maximum Data Bus Bandwidth (Mbytes/sec) |
11.4 |
15.3 |
19.1 |
22.9 |
30.5 |
38.1 |
|
Address Bus Width (bits) |
24 |
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Maximum Addressable Memory |
16 MB |
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Level 2 Cache Type |
None |
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Level 2 Cache Size |
-- |
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Level 2 Cache Bus Speed |
-- |
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Multiprocessing |
No |
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Internal Architecture |
Instruction Set |
80286 |
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MMX Support |
No |
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Processor Modes |
Real, Protected |
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x86 Execution Method |
Native |
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Internal Components |
Register Size (bits) |
16 |
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Pipeline Depth (stages) |
1 |
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Level 1 Cache Size |
None |
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Level 1 Cache Mapping |
-- |
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Level 1 Cache Write Policy |
-- |
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Integer Units |
1 |
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Floating Point Unit / Math Coprocessor |
Optional 80287 Coprocessor |
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Instruction Decoders |
1 |
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Branch Prediction Buffer Size / Accuracy |
None |
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Write Buffers |
None |
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Performance Enhancing Features |
None |
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Next: Third Generation
Processors
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