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by tomatocracy
2807 days ago
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If I remember correctly, this was usually done because Windows 3.x couldn't handle the full amount of RAM in the system directly for one or other reason. I might be misremembering but I recall some IO cards created a 'hole' by placing memory mapped IO regions somewhere well above 1MB (15M or so?) and Windows couldn't handle non contiguous physical RAM at that point in the address space as an example. |
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