Answer by davidbak for 80286 can switch from real mode to protected mode -...
This was intentional so that the CPU would support secure operating systems. In a secure operating system with rigorous memory access protections you could not allow any software - user or kernel...
View ArticleAnswer by Rico Pajarola for 80286 can switch from real mode to protected mode...
Just speculating here, but it might have been a product decision to encourage writing code for protected mode. It's also possible it was a combination of technical difficulties and product...
View ArticleAnswer by mcleod_ideafix for 80286 can switch from real mode to protected...
My guess is that it was merely a design decision based upon the assumption that once a protected mode OS is started, there is no need to go back. Most microprocessors at that time already booted in its...
View Article80286 can switch from real mode to protected mode - but why not back?
It's been a while, but I've read in a system programming book that you could switch your Intel 80286 CPU from the normal real mode to a more powerful protected mode. I clearly remember that they said...
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