645 SIGMA 0x8200 OR DLY IN+D ; SIGMA = 0xE200 (V86 access rights)
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.，这一点在服务器推荐中也有详细论述
7. 系统提示词（可直接用作第一版），详情可参考Line官方版本下载
on the tool may lead to a lack of understanding of the apps