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ULSI FPU
  ULSI Math-Co DX
  ULSI Math-Co SX, 20 MHz
  ULSI Math-Co US83C87, 25 MHz
  ULSI Math-Co US83C87, 25 MHz, variant
  ULSI Math-Co US83C87, 25 MHz, USA
  ULSI Math-Co US83C87, 33 MHz
  ULSI Math-Co DX, 33 MHz
  ULSI Math-Co DX, 40 MHz
  ULSI Math-Co DX, 40 MHz, USA
  ULSI Math-Co DX, 40 MHz, variant
  ULSI US83C87 DX/DLC, 40 MHz
  ULSI US83C87 DX/DLC, 40 MHz, variant
  ULSI US83C87-C DX/DLC, 40 MHz
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The ULSI Math Co-Processors
The ULSI 83C87 or Math-Co DX is an 80387-compatible coprocessor first introduced in early 1991, well after the IIT 3C87 and Cyrix 83D87 appeared. Like other 387 clones, it is somewhat faster than the Intel 387DX, particularly in its basic arithmetic functions. The transcendental functions, however, show only a slight speed improvement over the Intel 387DX.
 
Like other non-Intel 387 compatibles, the 83C87 does not support asynchronous operation of the CPU and the coprocessor. This means that the 83C87 always runs at the full speed of the CPU. It is available in 20, 25, 33, and 40 MHz versions. The ULSI is produced in low power CMOS; power consumption at 20 MHz is max. 800 mW (400 mW typical), at 25 MHz it is max. 1000 mW (500 mW typical), at 33 MHz it is max. 1250 mW (625 mW), and at 40 MHz it is max. 1500 mW (750 mW typical). The 83C87 is packaged in a 68-pin ceramic PGA.
 
ULSI coprocessors come with a lifetime warranty. ULSI Systems, Inc., will replace the coprocessor up to three times free of charge should it ever fail to function properly.
ULSI Math-Co DX
ULSI Math-Co DX Top Side
Math-Co DX
Advanced Math Coprocessor
ULSI
SYSTEMS
(M)(C)1990
10501 9340PC
ULSI Math-Co DX Back Side
D0029
USA
Donated by Jorge Segovia. Thanks a lot!  
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Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 40/1993
Made in:USA
Package Type:Ceramic
PGA-68
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ULSI Math-Co SX, 20 MHz
ULSI Math-Co SX, 20 MHz Top Side
Math-Co SX
Advanced Math Coprocessor
from
ULSI
SYSTEMS
(M)(C)1990
9248A1B
1003 20MHz
ULSI Math-Co SX, 20 MHz Back Side
SFPP08
KOREA
The Math-Co SX is the SX version of the ULSI 83C87/Math-Co DX for operation with an Intel 386SX or an AMD Am386SX. It is functionally equivalent to the 83C87. To aid low power laptop designs, the ULSI 83S87 features an advanced power saving design with a sleep mode and a standby mode with only minimal power requirements. The ULSI 83S87 is packaged in a 68-pin PLCC.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 48/1992
Made in:KOREA
Package Type:Plastic
PLCC-68
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ULSI Math-Co US83C87, 25 MHz
ULSI Math-Co US83C87, 25 MHz Top Side
Math-Co
US83C87 25MHz
ULSI (M)(C)1990
SYSTEMS 9136A3B
ULSI Math-Co US83C87, 25 MHz Back Side
FCLP50B
PHILIPPINES
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 36/1991
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI Math-Co US83C87, 25 MHz, variant
ULSI Math-Co US83C87, 25 MHz, variant Top Side
Math-Co
ULSI (M)(C)1990
SYSTEMS 9234A3B
US83C87ULSI
1003 25MHz
ULSI Math-Co US83C87, 25 MHz, variant Back Side
FEYP23B
PHILIPPINES
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 34/1992
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI Math-Co US83C87, 25 MHz, USA
ULSI Math-Co US83C87, 25 MHz, USA Top Side
Math-Co
ULSI
SYSTEMS
(M)(C)1990
9236PA
US83C87
1003 25MHz
ULSI Math-Co US83C87, 25 MHz, USA Back Side
FEZP25A
USA
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 36/1992
Made in:USA
Package Type:Ceramic
PGA-68
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ULSI Math-Co US83C87, 33 MHz
ULSI Math-Co US83C87, 33 MHz Top Side
Math-Co
US83C87 33MHz
ULSI
SYSTEMS
(M)(C)1990
9129A3B
ULSI Math-Co US83C87, 33 MHz Back Side
FCJP41
PHILIPPINES
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 29/1991
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI Math-Co DX, 33 MHz
ULSI Math-Co DX, 33 MHz Top Side
Math-Co DX
Advanced Math Coprocessor
from
ULSI
SYSTEMS 33
(M)(C)1990
1003 9317PB
ULSI Math-Co DX, 33 MHz Back Side
DGLP09
USA
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 17/1993
Made in:USA
Package Type:Ceramic
PGA-68
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ULSI Math-Co DX, 40 MHz
ULSI Math-Co DX, 40 MHz Top Side
Math-Co DX
Advanced Math Coprocessor
from
ULSI
SYSTEMS
40MHz
(M)(C)1990
1003 (M)(C)1990
9240PE
ULSI Math-Co DX, 40 MHz Back Side
FEZP14A
USA
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 40/1992
Made in:USA
Package Type:Ceramic
PGA-68
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ULSI Math-Co DX, 40 MHz, USA
ULSI Math-Co DX, 40 MHz, USA Top Side
Math-Co DX
Advanced Math Coprocessor
40
ULSI
SYSTEMS
(M)(C)1990
10501 9338PA
ULSI Math-Co DX, 40 MHz, USA Back Side
D0022
USA
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 38/1993
Made in:USA
Package Type:Ceramic
PGA-68
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ULSI Math-Co DX, 40 MHz, variant
ULSI Math-Co DX, 40 MHz, variant Top Side
Math-Co DX
Advanced Math Coprocessor
40
ULSI
SYSTEMS
121-02
(M)(C)1990
10501 9342A3C
ULSI Math-Co DX, 40 MHz, variant Back Side
D0037
PHILIPPINES
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Manufactured:week 42/1993
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI US83C87 DX/DLC, 40 MHz
ULSI US83C87 DX/DLC, 40 MHz Top Side
ULSI
Advanced Math Coprocessor
DX/DLC 40MHz
US83C87
10501
(R)(C)1990
9401A3C
ULSI US83C87 DX/DLC, 40 MHz Back Side
D0092
PHILIPPINES
The DX/DLC is a slightly enhanced version of the original ULSI 83C87 with increased standards compatibility, but still not 100% IEEE conform. Some transcendental functions have also been sped up.
 
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1991
Manufactured:week 01/1994
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI US83C87 DX/DLC, 40 MHz, variant
ULSI US83C87 DX/DLC, 40 MHz, variant Top Side
ULSI
Advanced Math Coprocessor
DX/DLC 40MHz
US83C87
10501
(R)(C)1990
9421A3B
ULSI US83C87 DX/DLC, 40 MHz, variant Back Side
D0221
PHILIPPINES
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1991
Manufactured:week 21/1994
Made in:Philippines
Package Type:Ceramic
PGA-68
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ULSI US83C87-C DX/DLC, 40 MHz
ULSI US83C87-C DX/DLC, 40 MHz Top Side
ULSI
Advanced Math Coprocessor
DX/DLC 40MHz
US83C87-C
121-02
(R)(C)1990
9437A3B
ULSI US83C87-C DX/DLC, 40 MHz Back Side
D0264
PHILIPPINES
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Core Frequency:40 MHz
Board Frequency:40 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1991
Manufactured:week 37/1994
Made in:Philippines
Package Type:Ceramic
PGA-68
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