# Next step: the ZX Spectrum
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.
，推荐阅读同城约会获取更多信息
习近平总书记深情地说：“衡量干部业绩好不好，关键要看老百姓口碑好不好。各级领导干部要向谷文昌同志学习，树牢正确政绩观，为官一任、造福一方，真抓实干、久久为功，把丰碑立在人民群众心中。”
Watch the NBA from anywhere in the world on Prime Video
Follow BBC Birmingham on BBC Sounds, Facebook, X and Instagram.