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Intel FPU
  Intel C8087
  Intel D8087-1
  Intel C8087-2
  Intel C8087-3
  Intel D80C187-16
  Intel C80287-3
  Intel D80287-6
  Intel D80287-8
  Intel C80287-10
  Intel D80287-10
  Intel D80C287A-12
  Intel C80287XL
  Intel C80287XL (i287 XL logo)
  Intel A80387-16
  Intel A80387-16B
  Intel A80387-20
  Intel A80387DX-20
  Intel A80387DX-20 w/ sSpec
  Intel A80387DX-25
  Intel A80387DX-33
  Intel A80387DX 16-33
  Intel N80387SX-16
  Intel N80387SX-20
  Intel N80387SX (16-25MHZ)
  Intel N80387SX-33
  Intel N80387SL
  Intel A80487SX
» Intel overview
» all FPU chips
 
The 8087 was the first coprocessor that Intel made available for the 80x86 family. It was introduced in 1980 and therefore does not have full compatibility with the IEEE-754 standard for floating-point arithmetic (which was finally released in 1985). It complements the 8088 and 8086 CPUs and can also be interfaced to the 80188 and 80186 processors.
 
The 8087 is implemented using NMOS. It comes in a 40-pin CERDIP and is available in 5 MHz, 8 MHz, and 10 MHz versions. Power consumption is rated at max. 2400 mW.
 
A neat trick to enhance the processing power of the 8087 for computations that use only the basic arithmetic operations (+,-,*,/) and do not require high precision is to set the precision control to single-precision. This gives one a performance increase of up to 20%.
 
With the help of an additional chip, the 8087 can in theory be interfaced to an 80186 CPU. The 80186 was used in some PCs (e.g. from Philips, Siemens) in 1982/1983.
Intel C8087
Intel C8087 Top Side
C8087
L6270114
(m)(c) i '80 '84
Intel C8087 Back Side
MALAY
8623 ADN
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Core Frequency:5 MHz
Board Frequency:5 MHz
Transistors:45,000
Circuit Size:3.00
Introduced:1980
Manufactured:week 27/1986
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D8087-1
Intel D8087-1 Top Side
D8087-1
L8180863
(m)(c) i '80 '84
Intel D8087-1 Back Side
38120240AA
MALAY CET816
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Core Frequency:10 MHz
Board Frequency:10 MHz
Transistors:45,000
Circuit Size:3.00
Introduced:1980
Manufactured:week 18/1988
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel C8087-2
Intel C8087-2 Top Side
C8087-2
L7330279
(m)(c) '80 '84
Intel C8087-2 Back Side
MALAY
8629 ADN
Donated by Christian Lederer. Thanks a lot!  
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Core Frequency:8 MHz
Board Frequency:8 MHz
Transistors:45,000
Circuit Size:3.00
Introduced:1980
Manufactured:week 33/1987
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel C8087-3
Intel C8087-3 Top Side
C8087-3
L4424130
(c)INTEL '80 '81
Intel C8087-3 Back Side
MALAYSIA C
P4381005 IL
Donated by Christian Lederer. Thanks a lot!  
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Core Frequency:5 MHz
Board Frequency:5 MHz
Transistors:45,000
Circuit Size:3.00
Introduced:1980
Manufactured:week 42/1984
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D80C187-16
Intel D80C187-16 Top Side
D80C187-16
L0090373
INTEL(m)(c)1986
Intel D80C187-16 Back Side
8908235MAA
MALAY QED 008
The 80187 is a rather late coprocessor designed to support the 80C186 embedded processor. It was introduced in 1989 and implements the complete 80387 instruction set. It is available for 12.5 and 16 MHz operation.
 
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Core Frequency:16 MHz
Board Frequency:16 MHz
Introduced:1989
Manufactured:week 09/1990
Made in:Malaysia
Package Type:Ceramic
DIP-40
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The 80287 is the original Intel coprocessor for the 80286 and was introduced in 1983. It uses the same execution unit as the 8087 and therefore has the same speed (sometimes slower due to additional overhead in CPU coprocessor communication).
As the 8087, it does not provide full compatibility with the IEEE-754 floating point standard. There are 6 MHz, 8 MHz, and 10 MHz versions. The 80287 has been replaced by its CMOS successor, the Intel 287XL, which has been introduced in 1990. It is based on the 387 core and therefore much faster than the 80287.
 
The 80287 was manufactured in NMOS technology, and is packaged in a 40-pin CERDIP. There are 6 MHz, 8 MHz, and 10 MHz versions. Power consumption can be estimated to be the same as that for the 8087, which is 2400 mW max.
Intel C80287-3
Intel C80287-3 Top Side
C80287-3
S40151
I523010D
(c) INTEL '83
Intel C80287-3 Back Side
MALAY C
P5191122 UX
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Core Frequency:3 MHz
Board Frequency:3 MHz
Introduced:1983
Manufactured:week 01/1984
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D80287-6
Intel D80287-6 Top Side
D80287-6
L7030421
(m)(c) I '83 '84
Intel D80287-6 Back Side
MALAY
8701 BEV
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Core Frequency:6 MHz
Board Frequency:6 MHz
Introduced:1983
Manufactured:week 03/1987
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D80287-8
Intel D80287-8 Top Side
D80287-8
L7070054
(m)(c) I '83 '84
Intel D80287-8 Back Side
36490130AA
MALAY 8706
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Core Frequency:8 MHz
Board Frequency:8 MHz
Introduced:1983
Manufactured:week 06/1987
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel C80287-10
Intel C80287-10 Top Side
C80287-10
L7250877
(m)(c)i '80 '82
Intel C80287-10 Back Side
37131410NB
MALAY
CDI 20
Donated by Christian Lederer. Thanks a lot!  
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Core Frequency:10 MHz
Board Frequency:10 MHz
Introduced:1983
Manufactured:week 25/1987
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D80287-10
Intel D80287-10 Top Side
D80287-10
L8180467
(m)(c) i '80 '82
Intel D80287-10 Back Side
3811280MAA
MALAY BEV 816
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Got one of these suckers out of an IBM PS/2 system model 60. Put it into 287 slot in a 286-20MHz M/Board. I learned that the main CPU socket and the 287co-pro socket run independantly of each other. Using utility software, I have found the 287 socket runs a 10MHz turbo, and 8MHz un-turbo, and that the main CPU socket runs at 20MHz turbo, and 8MHz un-turbo. I changed the clock-crystal from a 40MHz rock to a 50MHz rock, and now the main CPU runs at 25MHz, and the co-pro socket still runs at 10MHz. Good thing too, as the filched D80287-10 runs hot at its rated 10. I wouldn't like it to run any faster.
 
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Core Frequency:10 MHz
Board Frequency:10 MHz
Introduced:1980
Manufactured:week 18/1988
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel D80C287A-12
Intel D80C287A-12 Top Side
D80C287A-12
L9260241
INTEL(m)(c)i '80 '86
Intel D80C287A-12 Back Side
8845102MAA
MALAY PET 925
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Core Frequency:12 MHz
Board Frequency:12 MHz
Introduced:1980
Manufactured:week 26/1989
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel C80287XL
Intel C80287XL Top Side
C80287XL
L0371319
(m)(c) '80 '86
Intel C80287XL Back Side
8019709SAD
MALAY
WEZ 034
This chip is Intel's second-generation 287, first introduced in 1990. Since it is based on the 80387 coprocessor core, it features full IEEE 754 compatibility and faster instruction execution. Intel claims about 50% faster operation than the 80287 for typical benchmark tests. Compared with benchmark results for the AMD 80C287, which is identical to the Intel 80287, the Intel 287XL performed 66% faster than the AMD 80C287 on a fractal benchmark and 66% faster on the Whetstone benchmark.
Since the 287XL has all the additional instructions and enhancements of a 387, most software automatically identifies it as an 80387-compatible coprocessor and therefore can make use of extra 387-only features, such as the FSIN and FCOS instructions.
The 287XL is manufactured in CMOS and therefore uses much less power than the older NMOS-based 80287. At 12.5 MHz, the power consumption is rated at max. 675 mW, about 1/4 of the 80287 power consumption. The 287XL is available in either a 40-pin CERDIP (ceramic dual inline package) or a 44 pin PLCC (plastic leaded chip carrier). (This latter version is called the 287XLT and intended mainly for laptop use.) The 287XL is rated for speeds of up to 12.5 MHz.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Our shop sold these in big cardboard boxes. They were 20MHz chips, sold as covering all speed m/boards out there from 6MHz to 20MHz.
See my note for D80287-10......my own personal 286-20 m/board run a fixed 10MHz clock for the FPU co-pro socket, so where were these m/boards that needed a true 20MHz chip??? My m/board was made in 1993! (After the release of the XL-20 FPU's).
 
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Core Frequency:12 MHz
Board Frequency:12 MHz
Introduced:1990
Manufactured:week 37/1990
Made in:Malaysia
Package Type:Ceramic
DIP-40
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Intel C80287XL (i287 XL logo)
Intel C80287XL (i287 XL logo) Top Side
C80287XL
L2270115
(m)(c) '80 '86
Intel C80287XL (i287 XL logo) Back Side
8129123GAA
MALAY
WEZ 224
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Core Frequency:12 MHz
Board Frequency:12 MHz
Introduced:1990
Manufactured:week 27/1992
Made in:Malaysia
Package Type:Ceramic
DIP-40
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The Intel 80387 was the first generation of coprocessors designed specifically for the Intel 80386 CPU. It was introduced in 1986, about one year after the 80386 was brought to market. Early 386 system were therefore equipped with both a 80287 and a 80387 socket. The 80386 does work with an 80287, but the numerical performance is hardly adequate for such a system.
The 80387 has itself since been superseded by the Intel 387DX introduced by a quiet change in 1989 (see below). You might find it when acquiring an older 386 machine, though. The old 80387 is about 20% slower than the newer 387DX.
 
The 80387 is packaged in a 68-pin ceramic PGA, and was manufactured using Intel's older 1.5 micron CHMOS III technology, giving it moderate power requirements. Power consumption at 16 MHz is max. 1250 mW (750 mW typical), at 20 MHz max. 1550 mW (950 mW typical), and at 25 MHz max. 1950 mW (1250 mW typical).
Intel A80387-16
Intel A80387-16 Top Side
A80387-16
I7512021 SX029
(m)(c)INTEL '86
Intel A80387-16 Back Side
37440830AA
MALAY
IF 50
Comment by Paul Collins (pi314aussie[at]yahoo.com):
I got a "turbo card" for IBM PC and IBM PC/XT. It was a self contained unit, that plugged into the 8-bit ISA slot, and a ribbon cable that plugged into the 8088 slot.
This turbo card had an 80386 and 80387 and 1MegByte RAM (in DIL 4 bank old fashion setup). The whole thing ran the ORIGINAL 16 MHz Intel chips. Boy do they run 'hot'. I thought it might have been the early versions, so I replaced those mark 1's with (then) current 386-33 and 387-33 chips. Alas, they ran just as hot as before! N.B. the 4 banks of RAM only yeilded 640k of available memory to the system. (No 384k reserved for print-spoolers or RAM-disks, like the early "AST six-pack").
 
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 51/1987
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387 DX
Intel S-Spec: SX029
Package Type:Ceramic
PGA-68
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Intel A80387-16B
Intel A80387-16B Top Side
A80387-16B
I741203D SX009
(m)(c)INTEL '86
Intel A80387-16B Back Side
37262460AA
MALAY
CEV 38
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 41/1987
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387
Intel S-Spec: SX009
Package Type:Ceramic
PGA-68
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Intel A80387-20
Intel A80387-20 Top Side
A80387-20
I8052001 SX030
(M)(C)INTEL '86
Intel A80387-20 Back Side
37463000AA
MALAY
IF 03
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 05/1988
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387
Intel S-Spec: SX030
Package Type:Ceramic
PGA-68
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Intel A80387DX-20
Intel A80387DX-20 Top Side
A80387DX-20
L0260040
(m)(c) '86, '88
Intel A80387DX-20 Back Side
90096458AF
MALAY
UJ 024
The Intel 387DX is the second generation Intel 387 and was introduced in 1989. This version is done in a more advanced CMOS process than the 80387 that enables the coprocessor to run at a maximum frequency of 33 MHz, while the 80387 had a maximum frequency of 25 MHz.
The 387DX is about 20% faster than the 80387 at the same clock frequency. The Intel 387DX (and its predecessor 80387) are the only 387 coprocessors that support asynchronous operation of CPU and FPU. The 387 consists of a bus interface unit and a numerical execution unit. The bus interface unit always runs at the speed of the CPU clock.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 26/1990
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387 DX
Package Type:Ceramic
PGA-68
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Intel A80387DX-20 w/ sSpec
Intel A80387DX-20 w/ sSpec Top Side
A80387DX-20
SX105
L0183214
INTEL (m)(c) 1986
Intel A80387DX-20 w/ sSpec Back Side
30083700AB
MALAY
015
IS
Donated by Christian Lederer. Thanks a lot!  
An A80387DX-20 with sSpec number.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 18/1990
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387 DX
Intel S-Spec: SX105
Package Type:Ceramic
PGA-68
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Intel A80387DX-25
Intel A80387DX-25 Top Side
A80387DX-25
SX106
L9401505
INTEL (m)(c) 1986
Intel A80387DX-25 Back Side
39331280AA
MALAY
IS 939
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 40/1990
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387 DX
Intel S-Spec: SX106
Package Type:Ceramic
PGA-68
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Intel A80387DX-33
Intel A80387DX-33 Top Side
A80387DX-33
L0300329
(m)(c) '86, '88
Intel A80387DX-33 Back Side
90185171AE
MALAY 027
UJ
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 30/1990
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i387 DX
Package Type:Ceramic
PGA-68
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Intel A80387DX 16-33
Intel A80387DX 16-33 Top Side
A80387DX 16-33
L2350094 D0
(M)(c) '86'88
Intel A80387DX 16-33 Back Side
92106603FJ
A4
CAI 30
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 35/1992
L1 Cache:8 KB
CPU Code:i387 DX
Package Type:Ceramic
PGA-68
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The 387SX is the coprocessor for the Intel 386SX. It has all the features the Intel 80387 offers, including the ability for asynchronous operation of CPU and coprocessor. Due to the 16 bit data path between the CPU and the coprocessor, the 387SX is a bit slower than a 80387 operating at the same frequency.
In addition, the 387SX is based on the core of the original 80387, which executes instructions slower than the second generation 387DX. The 387SX comes in a 68-pin PLCC package and is available in 16, 20, 25 and 33 MHz versions.
Intel N80387SX-16
Intel N80387SX-16 Top Side
N80387SX-16
SX237
L0260221
INTEL (M)(C) '86
Intel N80387SX-16 Back Side
30183190
AA PE25
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 26/1990
L1 Cache:8 KB
CPU Code:i387 SX
Intel S-Spec: SX237
Package Type:Plastic
PLCC-48
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Intel N80387SX-20
Intel N80387SX-20 Top Side
N80387SX-20
SZ369
L2101309
(m)(c)1986
Intel N80387SX-20 Back Side
31303040
CA 202
XW
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 10/1992
L1 Cache:8 KB
CPU Code:i387 SX
Intel S-Spec: SZ369
Package Type:Plastic
PLCC-48
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Intel N80387SX (16-25MHZ)
Intel N80387SX (16-25MHZ) Top Side
N80387SX
(16-25MHZ)
C2260497
(m)(c)1986
Intel N80387SX (16-25MHZ) Back Side
8214624S
CI 224
EE
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 26/1992
L1 Cache:8 KB
CPU Code:i387 SX
Package Type:Plastic
PLCC-48
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Intel N80387SX-33
Intel N80387SX-33 Top Side
N80387SX-33
C247036W AI
(m)(c)1986
Intel N80387SX-33 Back Side
8227693W
CG 240
EE
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 47/1992
L1 Cache:8 KB
CPU Code:i387 SX
Package Type:Plastic
PLCC-48
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Intel N80387SL
Intel N80387SL Top Side
N80387SL
(16-25MHZ)
C2340780 A1
(m)(c)1986
Intel N80387SL Back Side
8223744S
CF 232
EE
The 80387SL is a coprocessor designed for use in systems based on an Intel 386SL CPU. The 386SL is derived from the 386SX. It is a static CHMOS IV design with very low power requirements that is intended to be used in notebook and laptop computers.

The 387SL, introduced in early 1992, has been designed to accompany the 386SL in machines with low power consumption and substitute the 387SX for this purpose. It features advanced power saving mechanisms. It is based on the 387DX core, rather than on the older and slower 80387 core (which is used by the 387SX).
 
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1986
Manufactured:week 34/1992
L1 Cache:8 KB
CPU Code:i387 SL
Package Type:Plastic
PLCC-48
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Intel A80487SX
Intel A80487SX Top Side
A80487SX
C3210292 B0
SZ494
INTEL (M) (c) 1989
Intel A80487SX Back Side
93151298CA
A4
AB 21
Comment by MoonKnight (moonknightus[at]yahoo.com):
Not a real co-processor. This is really just an i486DX in redesigned packaging that, when installed, would disable the onboard i486SX and take over main operation of the CPU/FPU.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Please note, this chip has one-more-pin than a true i486DX chip. It works as a kind of "disable the other guy" pin. This was to facilitate end-user installation, without first removing the system-manufacture's supplied CPU. ie. what end user can remove a PLCC or indeed a PQFP surface mounted chip. The A80486SX "cripple-chip" commonly came in PLCC and PQFP confugurations as often as it came in PGA! Please note, the i486SX "cripple-chip" has the same pins as the true i486DX chip, and are thus pin-for-pin, same-for-same (assuming equal clock).
 
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Introduced:04/1991
Manufactured:week 21/1993
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i487 SX
Intel S-Spec: SZ494
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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