Linked by Thom Holwerda on Sat 9th Feb 2013 18:54 UTC
Windows "The 16-bit Windows kernel was actually three kernels. One if you were using an 8086 processor, another if you were using an 80286 processor, and a third if you were using an 80386 processor. The 8086 kernel was a completely separate beast, but the 80286 and 80386 kernels shared a lot of code in common." As always, Raymond Chen delivers. If you don't yet follow his blog, you should. Right now. Click that bookmark or RSS button.
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But long mode isn't nearly as bad as 80286 protected mode, and it wasn't invented by Intel. You can still run legacy code on 64-bit processors just fine. It's just more painful than it was. But it's 2013 and if you need to run 16-bit real mode programs, you neither need a modern processor nor a modern OS.

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