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I'm developing my own OS, but I'm having some problems with Qemu, because I need to change the floppy image from grub.img to os.img while the emulation is running, but how can I do this?

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You can open qemu's console by pressing Ctrl-Alt-2. (It's been a long time since I used that, so I don't remember the exact command, sorry.)

Ctrl-Alt-1 to switch back to the VM's display.

If you start qemu from a terminal, an easier way of doing this is to run qemu with the -monitor stdio option, which will give the same qemu console in the terminal window.

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