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I was under the impression that the permissions only kicked in once you were in 32-bit mode on the 386, what Windows called "386 Enhanced" mode.
by pjc50 4mo ago
I was under the impression that the permissions only kicked in once you were in 32-bit mode on the 386, what Windows called "386 Enhanced" mode.
- peterfirefly 4mo agoAny protected mode (if enabled). It was introduced with the 286. The operating system/DOS extender could choose to let tasks (programs) run with the highest privileges, which would turn off some of the checks but not all of them -- you still needed valid selectors into valid slots in the descriptor tables.
- senfiaj 4mo agoIf I'm not mistaken 286's protected mode wasn't really that popular because it breaks real mode DOS programs. Meanwhile, 386's 32-bit protected mode with paging and virtual 8086 mode was a big success.