386

(redirected from 80387)

386

386

The first 32-bit CPU in, and third generation of, the Intel x86 family. The term may refer to the chip or to a PC that used it. Introduced in late 1985, it was the successor to the 286, and although adequate for DOS, it was slow for Windows and other graphics-based programs. It was the first x86 chip to unify memory management and allocate both extended and expanded (EMS) memory on demand. It also added Virtual 8086 Mode, which allowed multiple DOS applications to be multitasked side-by-side with Protected Mode (32-bit) applications. The 386 architecture was followed in all subsequent x86 chips. See PC and x86.

Technical Specs
Type: 32-bit multitasking microprocessor
Transistors: 275,000 (1.5 micron)
Package: 132-pin PGA
Registers: 32 32-bit
Real Mode: Performs as a 16-bit 8086 CPU; addresses 1MB memory.
Protected Mode: Addresses 4GB physical and 64TB virtual memory; provides access to memory protection and 32-bit instructions.
Virtual 8086 Mode: Protected Mode subset that runs a Real Mode application in a virtual machine.
References in periodicals archive ?
The CDF collaboration measured the W boson mass to be 80387 +/- 19 MeV/c2.
The program is run on a 33MHz 80386DX computer, equipped with a 210 MB fixed disk, 8 MB DRAM, four RS 232 serial ports, an 80387 numeric coprocessor, a super VGA monitor, and a printer.
Intel has sued Cyrix, claiming that the upstart company copied the design for its enormously successful 80387 math coprocessor.
For example, the PS/2 was about three times slower at list handling and worse at numerical computation, even after the addition of an 80387 maths coprocessor.
The 360CC computer and controller is equipped with a 20 MHz 80386 microprocessor and 80387 numeric co-processor with 2 Mbytes of RAM, a 3.
It is available with a 80386 and 80387 co-processor unit and will be available only on series 15 CNCs.
A typical configuration of a 32-bit 386 IP Lite (available now with 20 MHz chips, with 25 or 33 MHz chips available later) will have an 80387 coprocessor, up to 10 megabytes of RAM on the processor board, a sub-25-ms 40 or 100 megabyte hard disk drive, and one high density (1.
Typical systems will have a 40megabyte or larger hard disk with an average access time of 28 milliseconds or less for a high data transfer rate, not less than 2 megabytes of RAM with 32-bit memory access (4 megabytes or more are better to take advantage of die chip's power), an EGA or Video Graphics Array monitor, and an 80387 or Weitek numeric coprocessor.
An 80386 computer with an 80387 math coprocessor is directly tied to the 80486 server and acts as a dedicated slave to which instructions are downloaded.
Sockets for 33MHz Intel 80387 and Weitek coprocessors
It also includes the instruction set for the 80286, 80386, and the 8087, 80287, 80387 set of math coprocessors.
On the iPSC/2, the node processor is an Intel 80386; in addition, each node has an 80387 math coprocessor and communications hardware.