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|    alt.os.development    |    Operating system development chatter    |    4,255 messages    |
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|    Message 2,611 of 4,255    |
|    Joe Monk to All    |
|    Re: PDOS/86    |
|    15 Jul 21 05:39:26    |
      From: joemonk64@gmail.com              > When PDOS/86 is running on an 80386, at startup time, it will       > set all 16384 selectors to map the first 512 MiB of memory,       > and then never ever change them.              First off, there arent 16384 selectors on an 80386.              A selector is only 13 bits wide. 2^13 = 8192.              Bits 0-1 of a selector are the privilege level, and bit 2 specifies which       descriptor table (GDT,LDT) you are indexing into.              https://pdos.csail.mit.edu/6.828/2005/readings/i386/c05.htm              Joe              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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