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by dfawcus
1042 days ago
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According to the datasheet, which I've just looked at, it was not a '286 equivalent. Rather it added a paging mechanism whereby a 20 bit 'linear' address was mapped to a 24 bit 'physical' address. Using 1024 16k pages, so a bit like an internal LIM 4.0 scheme, but limited to 16M total rather than 24M. It has a pair of new instructions, to enter and exit the extended mapping mode, and the mappings are only changeable when not in the extended mapping mode. So a form of memory protection. See pages 20 and 21 of the following: https://datasheet.datasheetarchive.com/originals/scans/Scans... |
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