How does V86 work at the hardware level? When the VM bit (bit 17) of EFLAGS is set, the processor enters a hybrid state: it is still in protected mode with paging and privilege rings active, but most instructions execute as if the processor were in real mode. Segment addresses are computed as selector
Additionally, this can be written to a USB memory stick (flash,更多细节参见免实名服务器
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SDL uses a union headed by an enum for event polling (checking key presses, mouse movement, closing the window). I don't think would be possible to properly express tagged unions in APL without massive pain. Instead, I wrote functions that checked if keys were pressed, the mouse was moved and functions that returned relevant data if these events did happen.。超级权重对此有专业解读
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