2020年5月22日 · The 80486 contains parallel operating stages for decoding, operand fetch, execution and write back. So while an ADD reg,reg does take 3 clocks to perform, as it did in the original 8086, its execution overlaps with the previous/next operation, so the CPU can crank out one ADD reg,reg per clock.

2020年12月15日 · AMD countered Intel by shipping the popular (at least with PC enthusiasts) Am386-40, which many have claimed performed as well as the Intel 80486-25 at a lower price point. I don't know if AMD itself marketed the Am386 as comparable to the Intel 80486, but they definitely did market their 80486 "clones" as comparable to Intel's Pentium.

2019年8月21日 · I know that the 486SX had its FPU disabled, maybe by binning 486 CPUs into those with and without functioning FPUs. But did Intel eventually make a 486SX revision without an FPU on the die?

2019年6月7日 · The sheer size of a more than 100 times bigger cache made Motorola's effort seem useless in comparison (*9). Intel kept the single cache for the 80486 (1989) but now integrated 8 KiB of cache right onto the CPU - which didn't stop mainboard manufacturers from adding external caches, now in the region of 256 KiB to 1 MiB.

2024年2月1日 · Cache-coherent SMP (symmetric, or shared-memory, multi processing) systems can provide various grades of memory ordering guarantees, the stronger ones being more expensive but making it easier to w...

2024年10月19日 · 80486; psu; Share. Improve this question. Follow asked Oct 19, 2024 at 15:27. Irfan Irfan. 21 2 2 bronze ...

I have had great success with Gentoo Linux on the earliest generation of Intel 80486 processors, though I had to patch it (below). It works on the later ones too (486DX2 and 486DX4, both clock multiplied and having the back-ported Pentium CPUID instruction). I have it working on a Compaq LTE Elite 4/75CX laptop with a whopping 24MiB of memory.

2020年4月29日 · Intel's Socket 3, used for 486 processors, was a 19×19 pin grid array socket. However, all compatible processors, to my knowledge, used 17×17 PGA packages. What was the point of the extra pins arou...

How was the Intel 80486 (from 1989) debugged? I'm assuming it was written in some HDL language, like Verilog. However, how was testing and debugging of the CPU carried ou

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