Intel 80387SX

The Intel 80387SX (387SX or i387SX) is the math coprocessor for the Intel 80386SX microprocessor. It was used to perform floating point arithmetic operations directly in hardware. The coprocessor was designed only to work with the SX variant of the i386, rather than the standard 80386. This was because of the 80386SX's 16 bit data bus, which was modified from the original i386's 32 bit data bus.

An Intel i387SX (16 MHz - 25 MHz).

External links

Coprocessor.info : 80387 manufacturers overview and pictures

Intel processors

Discontinued
BCD oriented (4-bit)	4004 (1971) 4040 (1974)
pre-x86 (8-bit)	8008 (1972) 8080 (1974) 8085 (1977)
Early x86 (16-bit)	8086 (1978) 8088 (1979) 80186 (1982) 80188 (1982) 80286 (1982)
x87 (external FPUs)	8/16-bit databus 8087 (1980) 16-bit databus 80187 80287 80387SX 32-bit databus 80387DX 80487
IA-32 (32-bit)	80386 SX 376 EX 80486 SX DX2 DX4 SL RapidCAD OverDrive A100/A110 Celeron (1998) M D (2004) Pentium Original P5 OverDrive Pro II II OverDrive III 4 M Dual-Core some Core Solo Duo Tolapai
x86-64 (64-bit)	Celeron D Dual-Core Pentium 4 D Extreme Edition Dual-Core some Core 2 some i7
Other	CISC iAPX 432 EPIC Itanium RISC i860 i960 StrongARM XScale

Current
IA-32 (32-bit)	Atom CE SoC Quark
x86-64 (64-bit)	Atom CE SoC Celeron Pentium Core i3 i5 i7 i9 M Xeon E3 E5 E7 D Phi

Lists
Celeron Pentium Pro II III 4 D M Core Core 2 i3 i5 i7 i9 M Atom Xeon Itanium

Related
Tick–tock model Chipsets GPUs GMA HD and Iris Graphics PCHs SCHs ICHs PIIXs Stratix Codenames

Microarchitectures

x86

P5	800 nm P5 600 nm P54C 350 nm P54CS P55C 250 nm Tillamook
P6, Pentium M, Enhanced Pentium M	500 nm P6 350 nm P6 Klamath 250 nm Mendocino Dixon Tonga Covington Deschutes Katmai Drake Tanner 180 nm Coppermine Coppermine T Timna Cascades 130 nm Tualatin Banias 90 nm Dothan Stealey Tolapai Canmore 65 nm Yonah Sossaman
NetBurst	180 nm Willamette Foster 130 nm Northwood Gallatin Prestonia 90 nm Tejas and Jayhawk Prescott Smithfield Nocona Irwindale Cranford Potomac Paxville 65 nm Cedar Mill Presler Dempsey Tulsa
Core	65 nm Merom-L Merom Conroe-L Allendale Conroe Kentsfield Woodcrest Clovertown Tigerton 45 nm Penryn Penryn-QC Wolfdale Yorkfield Wolfdale-DP Harpertown Dunnington
Nehalem	45 nm Auburndale Beckton (Nehalem-EX) Bloomfield Clarksfield Gainestown (Nehalem-EP) Havendale Jasper Forest Lynnfield 32 nm Arrandale Clarkdale Gulftown (Westmere-EP) Westmere-EX
Sandy Bridge	32 nm Sandy Bridge Sandy Bridge-E Gladden 22 nm Ivy Bridge Ivy Bridge-EP Ivy Bridge-EX
Haswell	22 nm Haswell 14 nm Broadwell
Skylake	14 nm Skylake Kaby Lake (Amber Lake • Whiskey Lake) Coffee Lake Cascade Lake Comet Lake
Palm Cove	10 nm Cannon Lake
Sunny Cove	14 nm Cooper Lake 10 nm Ice Lake
Willow Cove	14 nm Rocket Lake 10 nm Tiger Lake Sapphire Rapids
Golden Cove	10 nm Alder Lake 7 nm Granite Rapids

Atom

Bonnell Saltwell	45 nm Silverthorne Diamondville Pineview Lincroft Tunnel Creek Stellarton Sodaville Groveland 32 nm Cedarview Penwell Cloverview Berryville Centerton
Silvermont Airmont	22 nm Valleyview Tangier Anniedale 14 nm Cherryview
Goldmont	14 nm Goldmont Goldmont Plus
Tremont	10 nm Tremont Gracemont

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