Intel’s 80836 was the first x86 with a 32-bit architecture. Several versions of this processor were offered. The two best known are the 386 SX (Single-word eXternal), which had a 16-bit data bus, and the 386 DX (Double-word eXternal) with a 32-bit data bus. Two other versions are worth noting, though: the SL, which was the first x86 to offer management of a cache (external) and the 386EX, used in the space program (the Hubble telescope uses this processor).
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Code name
P3
Date released
1985
Architecture
32 bits
Data bus
32 bits
Address bus
32 bits
Maximum memory
4096 MB
L1 cache
0 KB (controller sometimes present)
L2 cache
no
Clock frequency
16-33 MHz
FSB
same as clock frequency
FPU
80387
SIMD
no
Fabrication process
1,500-1,000 nm
Number of transistors
275,000
Power consumption
2 W @ 33 MHz
Voltage
5 V
Die surface area
42 mm² @ 1µ
Connector
132 pins
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