On emulators, you can take a snapshot of the current state. So for example, if you happen to die in a game, you can restore previously saved snapshot and continue from there.
On some systems, like Sinclair Spectrum, you can even do that on the real machine. It requires external hardware, like Interface 1bis. When you press a button in the device, it generates an NMI which handles the save.
I wonder if the same would be possible on MSX? It is more complex a system, but still?
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