8038x > IntelA80387DX-20

Modified: April 18, 2005, 5:08 pm

Manufacturer:	Intel
Model:	A80387DX-20
Speed:	20MHz
Type:	80387
Data Code:	9040
Introduced:	1987
Transistors:	??
Package:	68CPGA
Process:	1 Micron
Architecture:	80 bit FPU
Used in:	80386 Systems
Description:	Intel 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: Higher co-processor clock frequency. Execution of optimized FPU instructions requires fewer clock cycles. Data bus is 32-bit. The 80387 comes in two versions - 80387DX works with 80386DX processors, and 80387SX works with 80386SX CPUs (Since the SX and DX have different bus sizes)