Under Intel CPUs, this is done by means of interrupt 0x For this use case, consider using a secondary. You might need to do this for a short time and that is OK, but if you do not enable them afterwards, your system will be stuck and you will have to power it off. Flashing keyboard LEDs can be such a solution: It is an immediate way to attract attention or to display a status condition. Use a space after most keywords.
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