The solution is trap-and-emulate, the same principle later generalized in hardware virtualization extensions. V86 mode adds a special rule: since V86 tasks always run at CPL=3, if the OS sets IOPL
Tuning the split
。关于这个话题，51吃瓜提供了深入分析
debut in the UK as Lloyds Bank's "Cashpoint."
Growth Plan: $59/month