486


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486

486

The fourth generation of the Intel x86 family of CPU chips. The term may refer to the chip or to a PC that used it. Introduced in 1989, it was the successor to the 386 and the first chip in the line to include a built-in math coprocessor. Providing acceptable performance for DOS, it was bare minimum for Windows. Later versions of the chip doubled and tripled internal speeds (see DX2 and DX4). See OverDrive CPU, PC and x86.

Technical Specs
Type: 32-bit multitasking microprocessor
Transistors: 1,100,000 to 1,200,000 (1.0 micron)
Package: 168 or 169-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 ?
Despite the repeated assertion by Potts and several other presenters that RU 486 is safe, there was actually evidence presented that some participants were concerned about some of the pill's side effects.
This was a side effect which has not previously been associated with RU 486.
355(b) (1988), for RU 486 (mifepristone) for use as a pharmaceutical abortifacient.
Petitioners request that the Commissioner refuse to approve any NDA for RU 486 for use as a pharmaceutical abortifacient that does not contain adequate evidence that the drug has undergone nonclinical and clinical safety and effectiveness trials.
AMD said it began shipping 486 chips for PCs that run about 20 percent faster than its existing 486 models.
Right now, it's not much faster than a 486 with a comparable clock rate.
It will be selling at a premium price and the Pentium will probably be deeply discounted, as the 486 is today.
RU 486 works by blocking the action of progesterone, a hormone required to maintain pregnancy.
The remaining 402 recruits got RU 486, which is also known as mifepristone.
The researchers report that none of the women in the RU 486 group became pregnant, in contrast to four of those in the standard therapy group.
But Detwiler is a bit more selective about the equipment it accepts: it will take nothing older than a PC with a 486 microprocessor.
Windows 95, 486 66-megahertz processor or faster, with 8 megabytes RAM, 8 megabytes hard-drive space, 256-color SVGA monitor, sound card, CD-ROM.