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The Intel 486, officially named i486 and also known as 80486, is a microprocessor introduced in 1989. It is a higher-performance follow-up to the Intel 386.It represents the fourth generation of binary compatible CPUs following the 8086 of 1978, the Intel 80286 of 1982, and 1985's i386.
The 386 was the central processing unit (CPU) of many workstations and high-end personal computers of the time. The 386 began to fall out of public use starting with the release of the i486 processor in 1989, while in embedded systems the 386 remained in widespread use until Intel finally discontinued it in 2007.
The P5 microarchitecture was designed by the same Santa Clara team which designed the 386 and 486. [9] Design work started in 1989; [10]: 88 the team decided to use a superscalar RISC architecture which would be a convergence of RISC and CISC technology, [11] with on-chip cache, floating-point
Introduced paging on top of segmentation which is the most commonly used memory protection technology in modern operating systems ever since. Many additional powerful and valuable new instructions. i486 Intel's second generation of 32-bit x86 processors, introduced built-in floating point unit (FPU), 8 KB on-chip L1 cache, and pipelining ...
The i486SX was a microprocessor originally released by Intel in 1991. It was a modified Intel i486DX microprocessor with its floating-point unit (FPU) disabled. It was intended as a lower-cost CPU for use in low-end systems—selling for US$258—adapting the SX suffix of the earlier i386SX in order to connote a lower-cost option.
Chips and Technologies – left market after failed 386 compatible chip failed to boot the Windows operating system; IBM – Cyrix licensee and developer of Blue Lightning 486 line of processors, eventually left compatible chip market; Rise Technology – after five years of working on the slow mP6 chip (released in 1998), the company closed a ...
The Personal System/2 Model 70 386 and Personal System/2 Model 70 486 are midrange desktop computers in IBM's Personal System/2 (PS/2) family of personal computers. The PS/2 Model 70 386, released in June 1988, features an Intel 386 microprocessor clocked between 16 MHz and 25 MHz (depending on the submodel) and features the 32-bit Micro Channel architecture (MCA) bus; the Model 70 486 ...
An i486 DX2 was thus significantly faster than an i486 DX at the same bus speed thanks to the 8K on-chip cache shadowing the slower clocked external bus. Both 25/50 and 33/66 MHz Intel486 DX2 CPU uses the 800 nm process technology. [2]