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1992: ULSI
  week 34, 1992: ULSI Math-Co US83C87, 25 MHz, variant
  week 36, 1992: ULSI Math-Co US83C87, 25 MHz, USA
  week 40, 1992: ULSI Math-Co DX, 40 MHz
  week 48, 1992: ULSI Math-Co SX, 20 MHz
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» all chips made in 1992
 
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 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 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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