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IIT FPU
  IIT 2C87-8
  IIT 2C87-10
  IIT 2C87-12
  IIT 2C87-20
  IIT 3C87-20
  IIT 3C87-25
  IIT 3C87-33
  IIT 3C87-33 (Gold)
  IIT 3C87-40
  IIT 3C87SX-16
  IIT 3C87SX-20
  IIT 3C87SX-25
  IIT 3C87SX-33
  IIT XC87SLC-33
  IIT XC87DLC-33
  IIT 4C87DLC-33
  IIT 4C87DLC-40
  IIT X2 487DLX25/50
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IIT 2C87-8
IIT 2C87-8 Top Side
2C87-8
(M) (C) IIT 1988
2C87A02SMBC
ABW3
PT 90300A
IIT 2C87-8 Back Side
The IIT 2C87 was the first Intel 287 clone. It was introduced in 1989 and has about the same speed as the Intel 287XL. The 2C87 implements the full 387 instruction set. It is available for speeds of up to 20 MHz.
 
There is also a rare 25MHz version - too fast for almost every 286.
 
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Core Frequency:8 MHz
Board Frequency:8 MHz
Introduced:1989
Manufactured:week 30/1990
Made in:USA
Package Type:Ceramic
DIP-40
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IIT 2C87-10
IIT 2C87-10 Top Side
2C87-10
(M) (C) IIT 1988
1001AF1A1A1C
AES1
ID 90450L USA
IIT 2C87-10 Back Side
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Core Frequency:10 MHz
Board Frequency:10 MHz
Introduced:1989
Manufactured:week 45/1990
Made in:USA
Package Type:Ceramic
DIP-40
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IIT 2C87-12
IIT 2C87-12 Top Side
2C87-12
(M) (C) IIT 1988
1001AH1A2A2C
AGX1
PT 91140A USA
IIT 2C87-12 Back Side
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Core Frequency:12 MHz
Board Frequency:12 MHz
Introduced:1989
Manufactured:week 14/1991
Made in:USA
Package Type:Ceramic
DIP-40
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IIT 2C87-20
IIT 2C87-20 Top Side
2C87-20
(M) (C) IIT 1988
1001AF1A1A1C
ADF1
ID 90398A USA
IIT 2C87-20 Back Side
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Core Frequency:20 MHz
Board Frequency:20 MHz
Introduced:1989
Manufactured:week 39/1990
Made in:USA
Package Type:Ceramic
DIP-40
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The IIT chip 3C87 was introduced in 1989, about the same time as the Cyrix 83D87. Both coprocessors are faster than Intel's 387DX coprocessor. The IIT 3C87 also provides extra functions not available on any other 387 chip. It has 24 user-accessible floating-point registers organized into three register banks. Three additional instructions (FSBP0, FSBP1, FSBP2) allow switching from one bank to another. The register bank's main purpose is to aid the fourth additional instruction the 3C87 has (F4X4), which does a full multiply of a 4x4 matrix by a 4x1 vector, an operation common in 3D-graphics applications. There are very few applications that make use of it when an IIT coprocessor is detected at run time (among them Silver Screen and Fast-CAD 3-D).
The 3C87 is implemented in an advanced CMOS process and has low power requirements, typically about 600 mW. Like the 387 'clones' from Cyrix and ULSI, the 3C87 does not support asynchronous operation of the CPU and the coprocessor, but always runs at the full speed of the CPU. It is available in 16, 20, 25, 33, and 40 MHz versions.
IIT 3C87-20
IIT 3C87-20 Top Side
3C87-20
(M) (C) IIT 1988
1002BC3C2FOC
AFG1
PT 90500A USA
IIT 3C87-20 Back Side
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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 50/1990
Made in:USA
Package Type:Ceramic
PGA-68
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IIT 3C87-25
IIT 3C87-25 Top Side
3C87-25
(M) (C) IIT 1988
1002BE3C1FOC
ALN1
ID 91124A USA
IIT 3C87-25 Back Side
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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 12/1991
Made in:USA
Package Type:Metal
PGA-68
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IIT 3C87-33
IIT 3C87-33 Top Side
3C87-33
(M) (C) IIT 1988
1002BC3C1F0C
AIG1
ID 91054B USA
IIT 3C87-33 Back Side
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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 05/1991
Made in:USA
Package Type:Ceramic
PGA-68
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IIT 3C87-33 (Gold)
IIT 3C87-33 (Gold) Top Side
3C87-33
(M) (C) IIT 1988
1002ED4E8FC1B
AZOB
KY 9217 USA
IIT 3C87-33 (Gold) Back Side
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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 17/1992
Made in:USA
Package Type:Ceramic
PGA-68
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IIT 3C87-40
IIT 3C87-40 Top Side
3C87-40
(M) (C) IIT 1988
1002EM4E5HC1C
BAV
AM 9226
IIT 3C87-40 Back Side
PHILIPPINES
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 26/1992
Made in:Philippines
Package Type:Metal
PGA-68
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The 3C87SX is the version of the IIT 3C87 that is intended for use with an Intel or AMD 386SX CPU. It is functionally equivalent to the IIT 3C87. Due to the 16-bit data path between the CPU and the coprocessor in a 386SX based system, coprocessor instructions will execute somewhat slower than on the 3C87. It is the only 387SX coprocessor that is offered at speeds of 16, 20, 25, and 33 MHz. The 3C87SX is packed in a 68-pin PLCC.
IIT 3C87SX-16
IIT 3C87SX-16 Top Side
3C87SX-16
(M)(C)IIT1990
1004AA3C3E0C
AKU1
AN 9112
IIT 3C87SX-16 Back Side
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Manufactured:week 12/1991
Package Type:Plastic
PLCC-68
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IIT 3C87SX-20
IIT 3C87SX-20 Top Side
3C87SX-20
(M)(C)IIT1990
1004BA5C3E0C
ASN1
AN 9144
IIT 3C87SX-20 Back Side
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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 44/1991
Package Type:Plastic
PLCC-68
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IIT 3C87SX-25
IIT 3C87SX-25 Top Side
3C87SX-25
(M)(C)IIT1990
1004EC5C3EC1A
BEJ
AN 9231
IIT 3C87SX-25 Back Side
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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 31/1992
Package Type:Plastic
PLCC-68
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IIT 3C87SX-33
IIT 3C87SX-33 Top Side
3C87SX-33
1004FC9EAEC1C
CDY
9421 (M)(C) IIT 1990
IIT 3C87SX-33 Back Side
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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 21/1994
Package Type:Plastic
PLCC-68
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The IIT DLC/SLC are the coporocessors for 386/486 hybrid processors like the Cyrix Cx486 DLC/SLC or Texas Instruments TX486DLC. They can also be used interchangeably with the IIT 3C87 as normal 386 FPUs.
IIT XC87SLC-33
IIT XC87SLC-33 Top Side
XC87SLC-33
AE33AA
1004EM4E3EC1C
BQB
9316 (M)(C) IIT 1990
IIT XC87SLC-33 Back Side
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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 16/1993
Made in:Korea
Package Type:Plastic
PLCC-68
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IIT XC87DLC-33
IIT XC87DLC-33 Top Side
XC87DLC-33
1002FA2F5HC5C
EAJA
9411 (M)(C) IIT 1988
IIT XC87DLC-33 Back Side
PHILIPPINES
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 11/1994
Made in:Philippines
Package Type:Metal
PGA-68
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IIT 4C87DLC-33
IIT 4C87DLC-33 Top Side
4C87DLC-33
AH33AA
1002EE5C5HCIC
BZH
9336 (m) (c) IIT 1988
IIT 4C87DLC-33 Back Side
PHILIPPINES
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 36/1996
Made in:Philippines
Package Type:Metal
PGA-68
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IIT 4C87DLC-40
IIT 4C87DLC-40 Top Side
4C87DLC-40
1002FA2F5HCOC
9423 (m) (c) IIT 1988
IIT 4C87DLC-40 Back Side
PHILIPPINES
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 23/1994
Made in:Philippines
Package Type:Metal
PGA-68
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IIT X2 487DLX25/50
IIT X2 487DLX25/50 Top Side
487DLX25/50
IIT
X2
1202GC4G5HC0A
CMB
9450 (M) (C) IIT 1988
IIT X2 487DLX25/50 Back Side
PHILIPPINES
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 50/1994
Made in:Philippines
Package Type:Metal
PGA-68
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