2016年7月11日 · Weitek 4167 is a dedicated 487 FPU. Only early 486 boards have a socket for it. It was way faster than integrated 486DX. But software has to support it. Later when DX2 were …

2018年4月4日 · A 486 could be made as a 486DX with a CPU and FPU, 486SX (CPU only) or 487 (FPU). 486DX chips that only passed 1 of the 2 tests could be sold as 486SX or 487.

Because the Cyrix Cx486SLC/DLC CPUs didn't come with an internal FPU (floating-point unit), motherboards that supported these Cyrix CPUs sometimes also provided a Cyrix math …

Released in the early 1990s as a math coprocessor for personal computers, the Intel 487SX provided the missing floating-point unit (FPU) for the 486SX microprocessor. In actuality, the …

To distinguish a 287 and a 387 FPU, you can try if it can see the difference between +infinity and -infinity. FPU control. If an FPU is found to be present, you should set up the control registers …

2005年1月12日 · 487SX是为486SX升级设计的，但它不是FPU。 把它插在主板上，486SX就不工作，完全由487SX接替工作。 它具有486DX的所有功能。 所以它是CPU而不是FPU。 至少它 …

2015年11月28日 · A 487 is a 486 that fits into the 'FPU' socket of a 486SX board. They all have the same ALU. He probably meant something like using an SX2 or a 486-class processor from …

2018年12月6日 · There is a signal sent from the 487 that shuts down the 486SX or 486DX. The dual FPU issue can occur. I have a motherboard (486SLC) with soldered in 387 and a Weitek …

2016年12月15日 · While there might not be some major difference between 387 and 487 part in DX cpu, there are major differences with CPU-FPU communication. In 486DX fpu instructions …

2010年8月22日 · 80487SX 的確就等於 80486DX ... 多一根腳... 那根腳的用途很簡單, 就是要讓 486SX 不動作... Weitek 1167/3167 搭配在 80386 上, 但運作原理跟 x87 不同, 跑的當然也不是 …