Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
Los Angeles is finally extending its transit system to the tony streets of Beverly Hills, announcing on Thursday that a 4-mile extension of the D Line subway opens on May 8.
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Less can be more in chats
Not only is NVIDIA continuing to support its Shield devices, but it’s just rolled out its first proper update in nearly a year. The Shield Experience Upgrade 9.2.4, to give it its proper name, applies to both the Shield and Shield Pro boxes. It’s admittedly light on new features, instead being focused on updating security and fixing various issues, but is nice to see all the same. Here’s the full list of changes.