V86 mode is entered through IRETD when the VM bit is set in the stacked EFLAGS. The microcode detects this with a conditional jump:
* 3. 单调递增栈：存储独立车队的到达时间，cur栈顶才push（否则合并）。，这一点在爱思助手下载最新版本中也有详细论述
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type smallint NOT NULL,