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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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ULSI Math-Co US83C87, 25 MHz, variant


Math-Co ULSI (M)(C)1990 SYSTEMS 9234A3B US83C87ULSI 1003 25MHz	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

ULSI Math-Co US83C87, 25 MHz, USA


Math-Co ULSI SYSTEMS (M)(C)1990 9236PA US83C87 1003 25MHz	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

ULSI Math-Co DX, 40 MHz


Math-Co DX Advanced Math Coprocessor from ULSI SYSTEMS 40MHz (M)(C)1990 1003 (M)(C)1990 9240PE	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

ULSI Math-Co SX, 20 MHz


Math-Co SX Advanced Math Coprocessor from ULSI SYSTEMS (M)(C)1990 9248A1B 1003 20MHz	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