Intel 80387 familyIntel 80387 is a co-processor for 80386 microprocessor family. The 80387 runs at
the same speed as the 80386 and supports all execution modes of the main processor -
real, protected and virtual. Being fully object-code compatible with 80287 and 8087
co-processors, the 80387 has much greater performance due to a few factors:
The 80387 comes in two versions - 80387DX works with 80386DX processors, and 80387SX works with 80386SX CPUs. Die pictures:
![]() Picture of: Chips J38700DX 33 MHz
68-pin ceramic PGA ![]() Picture of: Cyrix FasMath CX-EMC87-33-GP 33 MHz
![]() Picture of: IIT 3C87-20 20 MHz
68-pin ceramic PGA ![]() Picture of: Intel A80387DX-16-33 16 - 33 MHz
68-pin ceramic PGA ![]() Picture of: LC Technology Green Math 4C87DX-40 40 MHz
68-pin plastic LCC ![]() Picture of: Reveal 387DX 68-pin ceramic PGA
![]() Picture of: ULSI US83C87 40 40 MHz
68-pin ceramic PGA ![]() Picture of: Xtend 83S87-SX25 25 MHz
68-pin plastic LCC
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Search CPU-WorldIdentify partRelated Links
Architecture Identification Pinouts Support chips At a glanceType: floating-point unit Introduction: 1987 Technology (micron): 1, 1.5 Frequency (MHz): 16 - 33 | ||||||