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Cyrix FPU
  Cyrix FasMath CX-82S87-NP-SV
  Cyrix 387DX-33
  Cyrix FasMath CX-83D87-20-GP-XA
  Cyrix FasMath CX-83D87-25 GP
  Cyrix FasMath CX-83D87-25-GP-KN
  Cyrix FasMath CX-83D87-25-GP-XA
  Cyrix FasMath CX-83D87-33 GP
  Cyrix FasMath CX-83D87-33-GP, black
  Cyrix FasMath CX-83D87-33-GP-KN
  Cyrix FasMath CX-83D87-40-GP
  Cyrix 387DX+
  Cyrix FasMath CX-83S87-16-JP
  Cyrix FasMath CX-83S87-16-KP
  Cyrix FasMath CX-83S87-20-JP
  Cyrix FasMath CX-83S87-20-KP
  Cyrix FasMath CX-83S87-25-JP
  Cyrix FasMath CX-83S87-33-JP
  Cyrix Cx487DLC-33GP
  Cyrix Cx87DLC-33QP
  Cyrix Cx87DLC-40QP
  Cyrix Cx487S-33QP
  Cyrix Cx487S-40QP
» Cyrix overview
» all FPU chips
 
This 80287-compatible chip was developed from the Cyrix 83D87 and has been available since 1991. It complies completely with the IEEE-754 standard for floating-point arithmetic and features nearly total compatibility with Intel's coprocessors, including implementation of the full Intel 80387 instruction set. It implements the transcendental functions with the same degree of accuracy and the superior speed of the Cyrix 83D87. This makes the Cyrix 82S87 the fastest and most accurate 287 compatible coprocessor available.
 
Documentation by Cyrix rates the 82S87 at 730 kWhets/sec for a 12.5 MHz system, while the Intel 287XL performs only 552 kWhets/sec. 82S87 chips manufactured after 1991 use the internals of the Cyrix 387+, which succeeds the original 83D87.
Cyrix FasMath CX-82S87-NP-SV
Cyrix FasMath CX-82S87-NP-SV Top Side
Cyrix
FasMath
CX-82S87-NP-SV
D30009
(C)(M) 1990 Cyrix
USA
Cyrix FasMath CX-82S87-NP-SV Back Side
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Core Frequency:8 MHz
Board Frequency:8 MHz
Introduced:1991
Made in:USA
Package Type:Ceramic
DIP-40
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The CX-83D87 was introduced in 1989. It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. The 83D87 also offers the most accurate transcendental functions of all coprocessors. It is the 387 clone with the highest degree of compatibility to the Intel 387DX. Unlike the Intel 387DX, the 83D87 (and all other 387-compatible chips as well) does not support asynchronous operation of CPU and coprocessor. To reduce power consumption the 83D87 features advanced power saving features. Those portions of the coprocessor that are not needed are automatically shut down. If no coprocessor instructions are being executed, all parts except the bus interface unit are shut down.
Cyrix 387DX-33
Cyrix 387DX-33 Top Side
387DX
387DX-33
(C)(M) 1989 Cyrix USA DC2068
Cyrix 387DX-33 Back Side
The predecessor of the CX-83D87. The Cyrix 387DX was soon replaced by the much more advanced CX-83D87
 
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Made in:USA
L1 Cache:8 KB
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-20-GP-XA
Cyrix FasMath CX-83D87-20-GP-XA Top Side
FasMath
CX-83D87-20-GP-XA
B30128
(c) (M) 1989 Cyrix
Cyrix FasMath CX-83D87-20-GP-XA Back Side
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-25 GP
Cyrix FasMath CX-83D87-25 GP Top Side
FasMath
CX-83D87-25 GP
B10102 USA
(c) (M) 1989 Cyrix
Cyrix FasMath CX-83D87-25 GP Back Side
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-25-GP-KN
Cyrix FasMath CX-83D87-25-GP-KN Top Side
FasMath
CX-83D87-25-GP-KN
B30108
(C)(M) 1989 Cyrix USA
Cyrix FasMath CX-83D87-25-GP-KN Back Side
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 01/1993
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-25-GP-XA
Cyrix FasMath CX-83D87-25-GP-XA Top Side
FasMath
CX-83D87-25-GP-XA
C3143C
(C)(M) 1989 Cyrix USA
Cyrix FasMath CX-83D87-25-GP-XA Back Side
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-33 GP
Cyrix FasMath CX-83D87-33 GP Top Side
FasMATH
CX-83D87-33 GP
D3130J
(c) (M) 1989 Cyrix USA
Cyrix FasMath CX-83D87-33 GP Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-33-GP, black
Cyrix FasMath CX-83D87-33-GP, black Top Side
FasMath
CX-83D87-33-GP
(C)(M) 1989 Cyrix USA
DBE338A
Cyrix FasMath CX-83D87-33-GP, black Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-33-GP-KN
Cyrix FasMath CX-83D87-33-GP-KN Top Side
FasMath
CX-83D87-33-GP-KN
C3139F
(C)(M) 1989 Cyrix USA
Cyrix FasMath CX-83D87-33-GP-KN Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 13/1993
Package Type:Ceramic
PGA-68
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Cyrix FasMath CX-83D87-40-GP
Cyrix FasMath CX-83D87-40-GP Top Side
FasMath
CX-83D87-40-GP
(C)(M) 1989 Cyrix USA DBE335D
Cyrix FasMath CX-83D87-40-GP Back Side
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix 387DX+
Cyrix 387DX+ Top Side
387DX+
387DX-40
(C)(M) 1989 Cyrix USA CE213A
Cyrix 387DX+ Back Side
The Cyrix 387DX+ is a CX-83D87 for the European marked, relabeled 387DX+. It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. It also offers the most accurate transcendental functions of all coprocessors and is the 387 clone with the highest degree of compatibility to the Intel 387DX.
 
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1989
Made in:USA
L1 Cache:8 KB
Package Type:Ceramic
PGA-68
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The 83S87 is the SX version of the Cyrix 83D87. Just as the 83D87 is the fastest 387-compatible coprocessor, the Cyrix 83S87 is the fastest of the 387SX compatible coprocessors, as well as providing the most accurate transcendental functions. 83S87 chips manufactured after 1991 use the internals of the Cyrix 387+, the successor to the original 83D87. The Cyrix 83S87 is ideally suited to be used with the Cyrix Cx486SLC CPU, a 486SX compatible CPU which is a replacement chip for the Intel 386SX CPU.
The 83S87 is packaged in a 68-pin PLCC and is available in 16, 20, 25, and 33 MHz versions. Due to the advanced power saving features of the Cyrix coprocessor, the typical power consumption of the 20 MHz version is only about 350 mW, while maximum power dissipation is 1.6 W.
Cyrix FasMath CX-83S87-16-JP
Cyrix FasMath CX-83S87-16-JP Top Side
FasMath
CX-83S87-16-JP
CB140E
(C)(M)1989 Cyrix USA
Cyrix FasMath CX-83S87-16-JP Back Side
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 40/1991
Package Type:Plastic
PLCC-68
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Cyrix FasMath CX-83S87-16-KP
Cyrix FasMath CX-83S87-16-KP Top Side
FasMath
CX-83S87-16-KP
A10064
(C)(M)1989 Cyrix USA
Cyrix FasMath CX-83S87-16-KP Back Side
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 06/1990
Package Type:Ceramic
CLCC-68
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Cyrix FasMath CX-83S87-20-JP
Cyrix FasMath CX-83S87-20-JP Top Side
FasMath
CX-83S87-20-JP
AAE223M
Cyrix FasMath CX-83S87-20-JP Back Side
(C)(M)1989 Cyrix USA
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 23/1992
Made in:Korea
Package Type:Plastic
PLCC-68
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Cyrix FasMath CX-83S87-20-KP
Cyrix FasMath CX-83S87-20-KP Top Side
FasMath
CX-83S87-20-KP
A30015
(C)(M)1989 Cyrix USA
Cyrix FasMath CX-83S87-20-KP Back Side
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 15/1990
Package Type:Ceramic
CLCC-68
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Cyrix FasMath CX-83S87-25-JP
Cyrix FasMath CX-83S87-25-JP Top Side
FasMath
CX-83S87-25-JP
ACE252A
Cyrix FasMath CX-83S87-25-JP Back Side
(C)(M)1989 Cyrix USA
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 52/1992
Made in:Korea
Package Type:Plastic
PLCC-68
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Cyrix FasMath CX-83S87-33-JP
Cyrix FasMath CX-83S87-33-JP Top Side
FasMath
CX-83S87-33-JP
AAE304A
Cyrix FasMath CX-83S87-33-JP Back Side
(C)(M)1989 Cyrix USA
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 04/1993
Made in:Korea
Package Type:Plastic
PLCC-68
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The 487DLC is a math processor for the Cyrix 486 DLC series of 386DX replacement processors. The Cx487DLC is an OEM only chip and has not been sold separately.
Cyrix Cx487DLC-33GP
Cyrix Cx487DLC-33GP Top Side
Cx487DLC
Cx487DLC-33GP
FOR OEM USE ONLY
(C)(M)1989 Cyrix USA ABE328C
Cyrix Cx487DLC-33GP Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Ceramic
PGA-68
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Cyrix Cx87DLC-33QP
Cyrix Cx87DLC-33QP Top Side
Cyrix
87DLC
Cx87DLC-33QP
AEE239C
Cyrix Cx87DLC-33QP Back Side
Another co-processor for 386/486 SLC/DLC systems. This chip is a 40-pin PQFP package mounted on a 68-pin PGA PCB to fit into a standard socket.
 
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Plastic
PQFP-80 on
PGA-68
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Cyrix Cx87DLC-40QP
Cyrix Cx87DLC-40QP Top Side
Cyrix
87DLC
Cx87DLC-40QP
AEE329B
Cyrix Cx87DLC-40QP Back Side
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Package Type:Plastic
PQFP-80 on
PGA-68
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Cyrix Cx487S-33QP
Cyrix Cx487S-33QP Top Side
Cx487S
Cx487S-33QP
AEF331A
Cyrix Cx487S-33QP Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 31/1993
Package Type:Plastic
PQFP-80 inside PGA-168
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Cyrix Cx487S-40QP
Cyrix Cx487S-40QP Top Side
Cx487S
Cx487S-40QP
AEH340A
Cyrix Cx487S-40QP Back Side
Donated by Christian Lederer. Thanks a lot!  
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 40/1993
Package Type:Plastic
PQFP-80 inside PGA-168
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