Linked by Thom Holwerda on Wed 12th Dec 2012 21:47 UTC
Linux "This tree removes ancient-386-CPUs support and thus zaps quite a bit of complexity [...] which complexity has plagued us with extra work whenever we wanted to change SMP primitives, for years. Unfortunately there's a nostalgic cost: your old original 386 DX33 system from early 1991 won't be able to boot modern Linux kernels anymore. Sniff. I'm not sentimental. Good riddance." Almost 21 years of support for a professor. Not bad.
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"I still have my 386SX-25 with the 80387 with 32Mb RAM. Although "back in the day" it only had 5Mb (4x1024kb + 4x256kb).

Are you sure? The 386sx only supported 16MB RAM (24 bit address bus).

It's theoretically possible. Back then some computers used "expanded memory", where you might have a pool of RAM (e.g. 256 blocks of 64 KiB) that the CPU can't access and a small number of those block/s could be switched into the CPU's address space (e.g. so that the CPU could access any 2 of the 64 KiB blocks at a time).

For example; you could have "almost 16 MiB" of normal RAM that uses "almost 16 MiB" of the CPU's address space; plus another 16 MiB of "expanded RAM" that only uses 128 KiB of the CPU's address space.

- Brendan

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