There was, technically, but it was quite sketchy. For example, in Windows 95 the zero page was mapped to physical memory in order to workaround an ancient CPU b

There was, technically, but it was quite sketchy. For example, in Windows 95 the zero page was mapped to physical memory in order to workaround an ancient CPU bug... for which CPU support was later dropped anyway[0][1]; as far as I know, Windows 98 keeps doing this. Try it yourself: run debug.com and type f 0:0 1000 0 It hangs the system even in Windows Me. [0] https://blogs.msdn.microsoft.com/oldnewthing/20110112-00/?p=11773 https://blogs.msdn.microsoft.com/oldnewthing/20110112-00/?p=... [1] https://blogs.msdn.microsoft.com/oldnewthing/20141003-00/?p=43923 https://blogs.msdn.microsoft.com/oldnewthing/20141003-00/?p=...